Pub Date : 2022-09-28DOI: 10.24200/amecj.v5.i03.196
M. Jafarizaveh, A. Tabrizi, F. Golbabaei
As main air pollutants, volatile organic compounds (VOCs) must be paid special attention. In this study, the removal efficiency of xylene from the air was investigated by nano-activated carbons (NACs) as an efficient adsorbent and compared to commercial activated carbons (ACs). In the chamber, the xylene vapor in pure air was generated, stored in the airbag (5 Li), and moved to adsorbents. Then, the xylene vapor was absorbed on the NAC/AC adsorbents and desorbed from it by a heat accessory. The efficiency of xylene removal with NACs and ACs was investigated in the dynamic and static systems based on 100-700 mg L-1 of xylene, flow rates of 100 ml min-1, and 100 mg of adsorbent at a humidity of 32% (25°C). Xylene concentrations were determined by gas chromatography equipped with a flame ionization detector (GC-FID). In the batch system, the maximum absorption capacity for NACs and ACs was obtained at 205.2 mg g-1 and 116.8 mg g-1, respectively. The mean adsorption efficiency for NACs and ACs adsorbents was obtained at 98.5% and 76.55%, respectively. The RSD% for NACs ranged between 1.1-2.5% in optimized conditions. The characterizations of the NACs adsorbent showed that the particle-size range was between 35-100 nm.
{"title":"A rapid removal of xylene from air based on nano-activated carbon in the dynamic and static systems and compared to commercial activated carbon before determination by gas chromatography","authors":"M. Jafarizaveh, A. Tabrizi, F. Golbabaei","doi":"10.24200/amecj.v5.i03.196","DOIUrl":"https://doi.org/10.24200/amecj.v5.i03.196","url":null,"abstract":"As main air pollutants, volatile organic compounds (VOCs) must be paid special attention. In this study, the removal efficiency of xylene from the air was investigated by nano-activated carbons (NACs) as an efficient adsorbent and compared to commercial activated carbons (ACs). In the chamber, the xylene vapor in pure air was generated, stored in the airbag (5 Li), and moved to adsorbents. Then, the xylene vapor was absorbed on the NAC/AC adsorbents and desorbed from it by a heat accessory. The efficiency of xylene removal with NACs and ACs was investigated in the dynamic and static systems based on 100-700 mg L-1 of xylene, flow rates of 100 ml min-1, and 100 mg of adsorbent at a humidity of 32% (25°C). Xylene concentrations were determined by gas chromatography equipped with a flame ionization detector (GC-FID). In the batch system, the maximum absorption capacity for NACs and ACs was obtained at 205.2 mg g-1 and 116.8 mg g-1, respectively. The mean adsorption efficiency for NACs and ACs adsorbents was obtained at 98.5% and 76.55%, respectively. The RSD% for NACs ranged between 1.1-2.5% in optimized conditions. The characterizations of the NACs adsorbent showed that the particle-size range was between 35-100 nm.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87015796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-28DOI: 10.24200/amecj.v5.i03.197
M. Dolatabadi, Ruhollah Akbarpour, Saeid Ahmadzadeh
The presence of pharmaceutical compounds in aqueous media, even in low concentrations, has caused adverse effects on human, animal, and environmental health. Captopril is a widely used pharmaceutical compound detected in the environment at different concentrations. Because of the concern and problems caused by the presence of captopril in water and the aquatic ecosystem, it appears necessary to remove it from the environment. The current study investigated captopril removal by a catalytic ozonation process using ZnO/Fe2O3 nanocomposite as a low-cost catalyst. The effects of variables such as ZnO/Fe2O3 nanocomposite dosage (0.5-2.5 g L-1), solution pH (3-11), initial captopril concentration (10-70 mg L-1), and ozone dosage (0.2-1.5 mg min-1) on captopril removal were investigated. The removal captopril of 99.4% was obtained in the optimum condition, including ZnO/Fe2O3 nanocomposite dosage of 2.0 g L-1, solution pH of 5.0, initial captopril concentration of 40 mg L-1, and ozone dosage of 0.5 mg min-1. The ZnO/Fe2O3 nanocomposite as a catalyst was a critical component in the catalytic ozonation process. According to the obtained results, the catalytic ozonation process in the presence of ZnO/Fe2O3 nanocomposite has high efficiency in removing captopril from water sources.
{"title":"Catalytic ozonation process using ZnO/Fe2O3 nanocomposite for efficient removal of captopril from aqueous solution","authors":"M. Dolatabadi, Ruhollah Akbarpour, Saeid Ahmadzadeh","doi":"10.24200/amecj.v5.i03.197","DOIUrl":"https://doi.org/10.24200/amecj.v5.i03.197","url":null,"abstract":"The presence of pharmaceutical compounds in aqueous media, even in low concentrations, has caused adverse effects on human, animal, and environmental health. Captopril is a widely used pharmaceutical compound detected in the environment at different concentrations. Because of the concern and problems caused by the presence of captopril in water and the aquatic ecosystem, it appears necessary to remove it from the environment. The current study investigated captopril removal by a catalytic ozonation process using ZnO/Fe2O3 nanocomposite as a low-cost catalyst. The effects of variables such as ZnO/Fe2O3 nanocomposite dosage (0.5-2.5 g L-1), solution pH (3-11), initial captopril concentration (10-70 mg L-1), and ozone dosage (0.2-1.5 mg min-1) on captopril removal were investigated. The removal captopril of 99.4% was obtained in the optimum condition, including ZnO/Fe2O3 nanocomposite dosage of 2.0 g L-1, solution pH of 5.0, initial captopril concentration of 40 mg L-1, and ozone dosage of 0.5 mg min-1. The ZnO/Fe2O3 nanocomposite as a catalyst was a critical component in the catalytic ozonation process. According to the obtained results, the catalytic ozonation process in the presence of ZnO/Fe2O3 nanocomposite has high efficiency in removing captopril from water sources.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76387206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-30DOI: 10.24200/amecj.v5.i02.188
Ali Faghihi zarandi, S. Karami-Mohajeri, Morteza Mehdipour Rabouri, Abbas Mohammadhosseini- Heyran, Z. Ahmadi
Mercury exposure can produce toxic organic compounds in the body. Also, mercury can potentially cause oxidative damage and cellular disorders. In this study, the determination of mercury values in urine and air of chloralkali workers based on copper nanoparticles functionalized in carboxylic carbon nanotubes (CuNPs@CNT-COOH) were obtained by cold vapor atomic absorption spectrometer (CV-AAS). The urine samples were determined by magnetic solid-phase extraction (MSPE) at pH 8.0. By measuring the mercury level in the air and the urine sample of workers, the level of oxidative stress (Malondialdehyde (MDA), Superoxide Dismutase (SOD) and Catalase (Cat)), Interleukin-6 (IL-6), and Tumor Necrosis Factor α (TNF-α) as the proinflammatory cytokines were measured in the subject group. The results revealed statistically significant differences in the mercury level of the urine samples in the case and control groups (p<0.001). Similarly, the malondialdehyde (MDA) level was significantly different between the two research groups (p<0.001). Catalase concentration was not significantly different in the two groups (p=0.059). The LOD and linear range for mercury determination in urine were achieved at 0.012 µg L−1 and 0.05-7.0 µg L−1, respectively. Workers’ exposure to mercury can significantly increase oxidative stress and inflammatory cell signaling molecules such as cytokines.
{"title":"Determination of mercury values in urine and air of chloralkali workers by copper nanoparticles functionalized in carboxylic carbon nanotubes and the effects of mercury exposure on oxidative stress","authors":"Ali Faghihi zarandi, S. Karami-Mohajeri, Morteza Mehdipour Rabouri, Abbas Mohammadhosseini- Heyran, Z. Ahmadi","doi":"10.24200/amecj.v5.i02.188","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.188","url":null,"abstract":"Mercury exposure can produce toxic organic compounds in the body. Also, mercury can potentially cause oxidative damage and cellular disorders. In this study, the determination of mercury values in urine and air of chloralkali workers based on copper nanoparticles functionalized in carboxylic carbon nanotubes (CuNPs@CNT-COOH) were obtained by cold vapor atomic absorption spectrometer (CV-AAS). The urine samples were determined by magnetic solid-phase extraction (MSPE) at pH 8.0. By measuring the mercury level in the air and the urine sample of workers, the level of oxidative stress (Malondialdehyde (MDA), Superoxide Dismutase (SOD) and Catalase (Cat)), Interleukin-6 (IL-6), and Tumor Necrosis Factor α (TNF-α) as the proinflammatory cytokines were measured in the subject group. The results revealed statistically significant differences in the mercury level of the urine samples in the case and control groups (p<0.001). Similarly, the malondialdehyde (MDA) level was significantly different between the two research groups (p<0.001). Catalase concentration was not significantly different in the two groups (p=0.059). The LOD and linear range for mercury determination in urine were achieved at 0.012 µg L−1 and 0.05-7.0 µg L−1, respectively. Workers’ exposure to mercury can significantly increase oxidative stress and inflammatory cell signaling molecules such as cytokines.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74411750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-30DOI: 10.24200/amecj.v5.i02.185
Mohammad Abbaszadehbezi, Mohammad Reza Rezaei Kahkha, Alireza Khammar, Morteza Mehdipour Rabouri
In this research, a miniaturized solid-phase extraction method based on pipette tip solid-phase extraction (PT-SPE) was employed for the determination of levofloxacin. Cobalt metal-organic framework (CoMOF) was used as an adsorbent. Levofloxacin was determined using high-performance liquid chromatography and UV detection (HPLC-UV). Important parameters that influence the extraction efficiency (i.e. pH, amount of adsorbent, extraction time, volumes of sample, and eluting solvent) were tested and optimized. Results indicated that the proposed method was validated over the range of 0.70 - 150.0 µg L-1. The relative standard deviation (RSD%) was below 2.75% for the levofloxacin. The limit of detection (LOD) of this method is 0.041 µg L-1. The preconcentration factor (PF) was obtained at 200 and the analysis time was around 10 min that confirming the reliability and accuracy of this method for extraction of levofloxacin. The PT-SPE procedure based on CoMOF adsorbent was efficiently extracted for levofloxacin more than 95%. In a static system, the adsorption capacity of CoMOF adsorbent for levofloxacin was obtained at 156.7 mg g-1 (n=10). The validation of results was successfully obtained for levofloxacin values based on the spiking real samples before determination by the HPLC technique.
{"title":"Application of pipette-tip solid-phase extraction technique for fast determination of levofloxacin from wastewater sample using cobalt metal-organic framework","authors":"Mohammad Abbaszadehbezi, Mohammad Reza Rezaei Kahkha, Alireza Khammar, Morteza Mehdipour Rabouri","doi":"10.24200/amecj.v5.i02.185","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.185","url":null,"abstract":"In this research, a miniaturized solid-phase extraction method based on pipette tip solid-phase extraction (PT-SPE) was employed for the determination of levofloxacin. Cobalt metal-organic framework (CoMOF) was used as an adsorbent. Levofloxacin was determined using high-performance liquid chromatography and UV detection (HPLC-UV). Important parameters that influence the extraction efficiency (i.e. pH, amount of adsorbent, extraction time, volumes of sample, and eluting solvent) were tested and optimized. Results indicated that the proposed method was validated over the range of 0.70 - 150.0 µg L-1. The relative standard deviation (RSD%) was below 2.75% for the levofloxacin. The limit of detection (LOD) of this method is 0.041 µg L-1. The preconcentration factor (PF) was obtained at 200 and the analysis time was around 10 min that confirming the reliability and accuracy of this method for extraction of levofloxacin. The PT-SPE procedure based on CoMOF adsorbent was efficiently extracted for levofloxacin more than 95%. In a static system, the adsorption capacity of CoMOF adsorbent for levofloxacin was obtained at 156.7 mg g-1 (n=10). The validation of results was successfully obtained for levofloxacin values based on the spiking real samples before determination by the HPLC technique.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80454000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-29DOI: 10.24200/amecj.v5.i02.178
Sara Zahedi, A. Asadipour, M. Dolatabadi, Saeid Ahmadzadeh
In the present study, response surface methodology was employed to investigate the effects of main variables, including the initial MB concentration, hydrogen peroxide dosage, current density, and electrolysis time on the removal efficiency of MB using the electro-Fenton (EF) process. The MB concentration determination by UV-VIS spectrometer. The EF process degrades the MB contaminant molecules by the highly oxidizing species of the •OH. A quadratic regression model was developed to predict the removal of MB, where the R2 value was found to be 0.9970, which indicates the satisfactory accuracy of the proposed model. ANOVA analysis showed a non-significant lack of fit value (0.0840). Moreover, the predicted correlation coefficient values (R2=0.9915) were reasonably in agreement with the adjusted correlation coefficient value (R2=0.9958), demonstrating a highly significant model for MB dye removal. In addition, the obtained results showed 95.8% MB was removed in the optimum removal efficiency, including the initial MB concentration of 20 mg L-1, H2O2 dosage of 400 μL, and the current density of 7.0 mA cm-2, and electrolysis time of 10 min which was agreed with the predicted removal efficiency of 98.3%. Electrical energy consumption was found to be 0.163 kWh m-3.
本研究采用响应面法考察了初始甲基溴浓度、过氧化氢用量、电流密度、电解时间等主要变量对电fenton (EF)法去除甲基溴效率的影响。紫外可见分光光度法测定MB浓度。EF过程通过高氧化性的•OH来降解MB污染物分子。建立了二次回归模型来预测MB的去除，其中R2值为0.9970，表明所提出的模型的精度令人满意。方差分析显示拟合值不显著缺乏(0.0840)。预测相关系数值(R2=0.9915)与校正相关系数值(R2=0.9958)吻合较好，表明该模型对MB染料去除效果显著。结果表明，当初始甲基溴浓度为20 mg L-1、H2O2用量为400 μL、电流密度为7.0 mA cm-2、电解时间为10 min时，甲基溴的最佳去除率为95.8%，与预测值98.3%基本一致。电能消耗为0.163 kWh m-3。
{"title":"Response surface modeling for the treatment of methylene blue from aqueous media using electro-Fenton process before determination by UV-VIS spectrometer: Kinetic and degradation mechanism","authors":"Sara Zahedi, A. Asadipour, M. Dolatabadi, Saeid Ahmadzadeh","doi":"10.24200/amecj.v5.i02.178","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.178","url":null,"abstract":"In the present study, response surface methodology was employed to investigate the effects of main variables, including the initial MB concentration, hydrogen peroxide dosage, current density, and electrolysis time on the removal efficiency of MB using the electro-Fenton (EF) process. The MB concentration determination by UV-VIS spectrometer. The EF process degrades the MB contaminant molecules by the highly oxidizing species of the •OH. A quadratic regression model was developed to predict the removal of MB, where the R2 value was found to be 0.9970, which indicates the satisfactory accuracy of the proposed model. ANOVA analysis showed a non-significant lack of fit value (0.0840). Moreover, the predicted correlation coefficient values (R2=0.9915) were reasonably in agreement with the adjusted correlation coefficient value (R2=0.9958), demonstrating a highly significant model for MB dye removal. In addition, the obtained results showed 95.8% MB was removed in the optimum removal efficiency, including the initial MB concentration of 20 mg L-1, H2O2 dosage of 400 μL, and the current density of 7.0 mA cm-2, and electrolysis time of 10 min which was agreed with the predicted removal efficiency of 98.3%. Electrical energy consumption was found to be 0.163 kWh m-3.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77822481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-29DOI: 10.24200/amecj.v5.i02.175
Faeze Khakbaz, M. Mahani, Mehdi Yoosefian
In this work, Cd MOF has been prepared using a hydrothermal method and characterized by the SEM, elemental mapping, XRD, EDS, and BET analysis. The diazinon stability has been investigated in various pH (4-8) and temperature (298oK – 323oK) using UV-Vis spectrometer in the range of 230 – 280 nm, at its main absorption peak at 247 nm. Adsorption behaviors of diazinon on the Cd MOF were considered in different conditions. UV-Vis spectroscopy was used to monitor the removal of diazinon using the Cd MOF. The adsorption capacity of 138 mg g-1 was obtained. The effect of temperature (298 K -323 K), pH (4-8), adsorbent dose (1-7 mg), initial concentration (4-12 mg L-1), stirring speed (0-500 rpm), and adsorption kinetics were studied using batch rout. All the studied parameters have shown significant effects on the efficiency of removal of diazinon by the Cd MOF. The adsorption thermodynamic was investigated in the temperature range of 298 k to 323 K and it has shown the endothermic nature of adsorption of diazinon using prepared Cd MOF. The adsorption isotherm follows by the Langmuir isotherm model. It was demonstrated that synthesized adsorbent could be effectively used for the removal of diazinon from water.
{"title":"Adsorption of diazinon using Cd-MOF nanoparticles before determination by UV-Vis spectrometer: isotherm, kinetic and thermodynamic study","authors":"Faeze Khakbaz, M. Mahani, Mehdi Yoosefian","doi":"10.24200/amecj.v5.i02.175","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.175","url":null,"abstract":"In this work, Cd MOF has been prepared using a hydrothermal method and characterized by the SEM, elemental mapping, XRD, EDS, and BET analysis. The diazinon stability has been investigated in various pH (4-8) and temperature (298oK – 323oK) using UV-Vis spectrometer in the range of 230 – 280 nm, at its main absorption peak at 247 nm. Adsorption behaviors of diazinon on the Cd MOF were considered in different conditions. UV-Vis spectroscopy was used to monitor the removal of diazinon using the Cd MOF. The adsorption capacity of 138 mg g-1 was obtained. The effect of temperature (298 K -323 K), pH (4-8), adsorbent dose (1-7 mg), initial concentration (4-12 mg L-1), stirring speed (0-500 rpm), and adsorption kinetics were studied using batch rout. All the studied parameters have shown significant effects on the efficiency of removal of diazinon by the Cd MOF. The adsorption thermodynamic was investigated in the temperature range of 298 k to 323 K and it has shown the endothermic nature of adsorption of diazinon using prepared Cd MOF. The adsorption isotherm follows by the Langmuir isotherm model. It was demonstrated that synthesized adsorbent could be effectively used for the removal of diazinon from water.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76143464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-29DOI: 10.24200/amecj.v5.i02.184
Aktham N Jasim, Nagham S. Turkey, Hussein Fares Abd-Alrazack
In this study, a new flow injection analysis (FIA) based on a microfluidic flow cell (MFC) with a sample capacity of 40 µL is described. A Tungsten lamp directs light from a typical 2100P Portable Turbidimeter apparatus into a quartz flow cell through a round sidewall aperture of 2.0 mm and emerges through the identical aperture on the opposite side of the flow cell, where a photodiode array (light detector) detects the passing light. When compared to a traditional cuvette (25 mm x 60 mm round) with the same nominal route length, this technique improves sensitivity by around 4.0. This improvement is due to the use of a short, narrow internal diameter microfluid as the flow cell, which reduces physical dispersion. The designed flow cell has been evaluated by developing a turbidimetric method for the detection of promethazine in pure form or pharmaceutical dosages. The developed method is based on forming of a yellowish ion-pair association complex due to the reaction of promethazine and sodium tetraphenylborate (STPB) in an acidic medium. At the flow optimum conditions, the calibration curve (CC) and the LOD for promethazine were obtained 0.5-90 µg mL-1 and 0.35 µg mL-1, respectively (R2 = 0.9955).
{"title":"Design a continuous microfluidic flow cell for turbidimetric-flow injection technology: A new approach for routine analysis of active pharmaceutical formulations","authors":"Aktham N Jasim, Nagham S. Turkey, Hussein Fares Abd-Alrazack","doi":"10.24200/amecj.v5.i02.184","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.184","url":null,"abstract":"In this study, a new flow injection analysis (FIA) based on a microfluidic flow cell (MFC) with a sample capacity of 40 µL is described. A Tungsten lamp directs light from a typical 2100P Portable Turbidimeter apparatus into a quartz flow cell through a round sidewall aperture of 2.0 mm and emerges through the identical aperture on the opposite side of the flow cell, where a photodiode array (light detector) detects the passing light. When compared to a traditional cuvette (25 mm x 60 mm round) with the same nominal route length, this technique improves sensitivity by around 4.0. This improvement is due to the use of a short, narrow internal diameter microfluid as the flow cell, which reduces physical dispersion. The designed flow cell has been evaluated by developing a turbidimetric method for the detection of promethazine in pure form or pharmaceutical dosages. The developed method is based on forming of a yellowish ion-pair association complex due to the reaction of promethazine and sodium tetraphenylborate (STPB) in an acidic medium. At the flow optimum conditions, the calibration curve (CC) and the LOD for promethazine were obtained 0.5-90 µg mL-1 and 0.35 µg mL-1, respectively (R2 = 0.9955). ","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82249482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-29DOI: 10.24200/amecj.v5.i02.186
Yasaman Sanaei, M. Zeeb, S. Homami, A. Monzavi, Z. Khodadadi
Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine (CCF/ZIF-71/Fe3O4/PTh) was fabricated, characterized, and applied as efficient magnetic sorbent in magnetic solid-phase extraction (MSPE) of cadmium from water and food samples before determination by flame atomic absorption spectrometry (FAAS). This modification of carbonized cotton fabric led to making a great surface area and porosity, increase extraction efficiency, and acceptable selectivity. The characterization of this proposed sorbent was performed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and Fourier transform-infrared (FT-IR) spectroscopy analysis techniques. The impact of several analytical parameters including pH, sorbent dosage, time of extraction, desorption condition, chelating agent concentration, the amount of salt and effect of potentially interfering ions on the selectivity and extraction recoveries of cadmium, were evaluated and optimized. In this proposed methodology, the limit of detection (LOD), the limit of quantification (LOQ), and relative standard deviation (RSD, n = 3) were found to be 0.21 ng mL−1, 0.6 ng mL−1 and lower than 3.0%, respectively. The validation and accuracy of the new advanced procedure were confirmed by applying the proposed procedure for certified reference materials (SRM1570A). Eventually, CCF/ZIF-71/Fe3O4/PTh can be utilized as a selective sorbent, for the rapid, accurate and sensitive determination of Cd (II) in the samples.
制备了碳化棉织物/咪唑酸分子筛框架-71/Fe3O4/聚硫氨酸(CCF/ZIF-71/Fe3O4/PTh)，对其进行了表征，并将其作为高效磁性吸附剂应用于水和食品样品的磁固相萃取(MSPE)中，然后用火焰原子吸收光谱法(FAAS)测定。对炭化棉织物进行改性，使其比表面积和孔隙率大，萃取效率提高，选择性好。采用x射线衍射(XRD)、场发射扫描电镜(FE-SEM)和傅里叶变换红外(FT-IR)光谱分析技术对该吸附剂进行了表征。考察了pH、吸附剂用量、提取时间、解吸条件、螯合剂浓度、盐用量以及潜在干扰离子对镉的选择性和提取率的影响。在该方法中，检测限(LOD)、定量限(LOQ)和相对标准偏差(RSD, n = 3)分别为0.21 ng mL - 1、0.6 ng mL - 1和小于3.0%。通过应用经认证的标准物质(SRM1570A)的建议程序来确认新先进程序的有效性和准确性。最终，利用CCF/ZIF-71/Fe3O4/PTh作为选择性吸附剂，可快速、准确、灵敏地测定样品中的Cd (II)。
{"title":"Magnetic solid-phase extraction based on the Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine followed by atomic absorption spectrometry for cadmium monitoring in water, tomato and cabbage samples","authors":"Yasaman Sanaei, M. Zeeb, S. Homami, A. Monzavi, Z. Khodadadi","doi":"10.24200/amecj.v5.i02.186","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.186","url":null,"abstract":"Carbonized cotton fabric/zeolite imidazolate framework-71/Fe3O4/polythionine (CCF/ZIF-71/Fe3O4/PTh) was fabricated, characterized, and applied as efficient magnetic sorbent in magnetic solid-phase extraction (MSPE) of cadmium from water and food samples before determination by flame atomic absorption spectrometry (FAAS). This modification of carbonized cotton fabric led to making a great surface area and porosity, increase extraction efficiency, and acceptable selectivity. The characterization of this proposed sorbent was performed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and Fourier transform-infrared (FT-IR) spectroscopy analysis techniques. The impact of several analytical parameters including pH, sorbent dosage, time of extraction, desorption condition, chelating agent concentration, the amount of salt and effect of potentially interfering ions on the selectivity and extraction recoveries of cadmium, were evaluated and optimized. In this proposed methodology, the limit of detection (LOD), the limit of quantification (LOQ), and relative standard deviation (RSD, n = 3) were found to be 0.21 ng mL−1, 0.6 ng mL−1 and lower than 3.0%, respectively. The validation and accuracy of the new advanced procedure were confirmed by applying the proposed procedure for certified reference materials (SRM1570A). Eventually, CCF/ZIF-71/Fe3O4/PTh can be utilized as a selective sorbent, for the rapid, accurate and sensitive determination of Cd (II) in the samples.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80780277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-28DOI: 10.24200/amecj.v5.i02.169
Nur Rahimah Said, M. Rezayi, N. S. Abdul Manan, A. Sahebkar, Y. Alias
In this research, the determination and complexation process between 3,3'-(2,2'-(4-methyl-phenylenesulfonamido)bis(ethane-2,1-diyl))bis(1-benzyl-3H-benzo[d]imidazol-1-ium)dibromide with Ni2+, Zn2+, Pd2+, Ag+, and Hg2+ cations in the binary mixture of methanol (MeOH) and water (H2O) at different temperatures (15, 25, 35 and 45ºC) were studied using a conductometric method. The results show that the stoichiometry of the complexes in all binary mixed solvents for Ni2+, Zn2+, and Pd2+ were 1:1 (M:L), while in other cases 1:2 (M:L) and 2:1(M:L). The stability constants (log ) of complex formation have been determined by fitting molar conductivity curves using a computer program (GENPLOT). The obtained data shows that in the pure methanol solvent system, the stability order is Ni2+< Pd2+
{"title":"Analysis of complexation between new bidentate bis-NHC ligand and some metal cations at different temperature","authors":"Nur Rahimah Said, M. Rezayi, N. S. Abdul Manan, A. Sahebkar, Y. Alias","doi":"10.24200/amecj.v5.i02.169","DOIUrl":"https://doi.org/10.24200/amecj.v5.i02.169","url":null,"abstract":"In this research, the determination and complexation process between 3,3'-(2,2'-(4-methyl-phenylenesulfonamido)bis(ethane-2,1-diyl))bis(1-benzyl-3H-benzo[d]imidazol-1-ium)dibromide with Ni2+, Zn2+, Pd2+, Ag+, and Hg2+ cations in the binary mixture of methanol (MeOH) and water (H2O) at different temperatures (15, 25, 35 and 45ºC) were studied using a conductometric method. The results show that the stoichiometry of the complexes in all binary mixed solvents for Ni2+, Zn2+, and Pd2+ were 1:1 (M:L), while in other cases 1:2 (M:L) and 2:1(M:L). The stability constants (log ) of complex formation have been determined by fitting molar conductivity curves using a computer program (GENPLOT). The obtained data shows that in the pure methanol solvent system, the stability order is Ni2+< Pd2+<Zn2+<Hg2+<Ag+ and the complexation process seems more stable in pure methanol in most cases. The thermodynamic parameters were determined conductometrically. The complexes in all cases were found to be enthalpy destabilized but entropy stabilized. The experimental data was tested by using an artificial neural network (ANN) program and was in good agreement with the estimated data.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72666190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-30DOI: 10.24200/amecj.v5.i01.162
Stanley Chukwuemeka Ihenetu, Victor Obinna Njoku, Francis Chizoruo Ibe, Gang Li, A. Chinweuba, Christian Ebere Enyoh
Determination of environmental pollution in the surface water is very important. So, in this study, determination, and health risk assessment were evaluated. The pollutions such as anions, cations, and heavy metals were analyzed in surface water by photometer spectrometry and atomic absorption spectrometry (AAS). TDS for wet and dry seasons go from 122.17±1.74 mg L-1 to 63.80±0.86 mg L-1. The high phosphate levels in both wet and dry seasons are recorded from 60.74±0.61 - 60.27±0.38 mg L-1 in both seasons. Iron values observed range from 8.42±0.06 to 6.28±0.11 mg L-1 in the wet and dry season, Cu was recorded between 0.08±0.01 - 0.07±0.01 mg L-1, Mn recorded from 0.07±0.01 to 0.06±0.01 mg L-1, Zn recorded between 2.29±0.09 - 1.15±0.09 mg L-1, and Pb recorded from 0.69±0.09 to 0.40±0.18 mg L-1 while Cd and Ni were not detected in the study. Water quality index (WQI) values were determined as 549 for wet and 328 for the dry season, the hazard indices for both seasons are below one. The outcomes in this present study showed that the level of Pb in the surface water could present a carcinogenic risk to both adults and children. All heavy metals results were validated by ET-AAS.
{"title":"Determination of pollutions in the surface of water samples from Ogbajarajara river, Nigeria by spectrophotometer and atomic absorption spectrometry before evaluation of health risk assessment","authors":"Stanley Chukwuemeka Ihenetu, Victor Obinna Njoku, Francis Chizoruo Ibe, Gang Li, A. Chinweuba, Christian Ebere Enyoh","doi":"10.24200/amecj.v5.i01.162","DOIUrl":"https://doi.org/10.24200/amecj.v5.i01.162","url":null,"abstract":"Determination of environmental pollution in the surface water is very important. So, in this study, determination, and health risk assessment were evaluated. The pollutions such as anions, cations, and heavy metals were analyzed in surface water by photometer spectrometry and atomic absorption spectrometry (AAS). TDS for wet and dry seasons go from 122.17±1.74 mg L-1 to 63.80±0.86 mg L-1. The high phosphate levels in both wet and dry seasons are recorded from 60.74±0.61 - 60.27±0.38 mg L-1 in both seasons. Iron values observed range from 8.42±0.06 to 6.28±0.11 mg L-1 in the wet and dry season, Cu was recorded between 0.08±0.01 - 0.07±0.01 mg L-1, Mn recorded from 0.07±0.01 to 0.06±0.01 mg L-1, Zn recorded between 2.29±0.09 - 1.15±0.09 mg L-1, and Pb recorded from 0.69±0.09 to 0.40±0.18 mg L-1 while Cd and Ni were not detected in the study. Water quality index (WQI) values were determined as 549 for wet and 328 for the dry season, the hazard indices for both seasons are below one. The outcomes in this present study showed that the level of Pb in the surface water could present a carcinogenic risk to both adults and children. All heavy metals results were validated by ET-AAS.","PeriodicalId":7797,"journal":{"name":"Analytical Methods in Environmental Chemistry Journal","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72989670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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