The present paper shows that lanthanum(III) nitrate hexahydrate can be used as mild and environment friendly homogeneous catalyst for an efficient one-pot multi-component synthesis of biologically active 1,8-dioxo-octahydroxanthene and 14H-dibenzo[a,j]xanthene derivatives. The solvent free condensation reaction of aromatic aldehydes and dimedone or β-naphthol was carried out at 70-80oC during 10-30 min. The obtained compounds were analysed by mass and NMR spectroscopic techniques. The advantages of this eco-friendly synthesis route are numerous, and include the use of an inexpensive catalyst, high to excellent yield, short reaction time and high catalytic activity that can make this method an interesting alternative to multi-step approaches.
{"title":"Facile and Efficient Synthesis of Xanthene Derivatives Mediated by Lanthanum(Iii) Nitrate Hexahydrate under Solvent Free Conditions","authors":"K. Shaikh, Uddhav N. Chaudhar","doi":"10.19261/cjm.2020.774","DOIUrl":"https://doi.org/10.19261/cjm.2020.774","url":null,"abstract":"The present paper shows that lanthanum(III) nitrate hexahydrate can be used as mild and environment friendly homogeneous catalyst for an efficient one-pot multi-component synthesis of biologically active 1,8-dioxo-octahydroxanthene and 14H-dibenzo[a,j]xanthene derivatives. The solvent free condensation reaction of aromatic aldehydes and dimedone or β-naphthol was carried out at 70-80oC during 10-30 min. The obtained compounds were analysed by mass and NMR spectroscopic techniques. The advantages of this eco-friendly synthesis route are numerous, and include the use of an inexpensive catalyst, high to excellent yield, short reaction time and high catalytic activity that can make this method an interesting alternative to multi-step approaches.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"7 1","pages":"99-104"},"PeriodicalIF":0.5,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80123344","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}
A series of novel isolated β-lactams 3a-c and thiazolidinone derivatives 4a-c were successfully synthesized from reactions of new Schiff's bases 2a-c with chloroacetyl chloride and thioglycolic acid. The chemical structures of the new compounds were confirmed through different spectroscopic techniques including IR, 1 H and 13 C NMR, mass spectrometry and elemental analysis. The antimicrobial activity of the obtained compounds was assessed in vitro against gram-positive Staphylococcus aureus and gram-negative Escherichia coli bacteria and Aspergillus flavus and Candida albicans fungi. All compounds exhibited good to excellent antimicrobial activity against the tested strains. Furthermore, a molecular docking study was carried out for the synthesized compounds and the results indicated that compounds 3b and 4b display comparable binding affinity scores as that of glutamate. These two compounds are promising candidates as antibacterial and antifungal agents that would deserve further investigations.
{"title":"Novel Β-lactams and Thiazolidinone Derivatives from 1,4-dihydroquinoxaline Schiff’s Base: Synthesis, Antimicrobial Activity and Molecular Docking Studies","authors":"H. Hrichi, Nadia Ali Ahmed Elkanzi, R. Bakr","doi":"10.19261/CJM.2019.647","DOIUrl":"https://doi.org/10.19261/CJM.2019.647","url":null,"abstract":"A series of novel isolated β-lactams 3a-c and thiazolidinone derivatives 4a-c were successfully synthesized from reactions of new Schiff's bases 2a-c with chloroacetyl chloride and thioglycolic acid. The chemical structures of the new compounds were confirmed through different spectroscopic techniques including IR, 1 H and 13 C NMR, mass spectrometry and elemental analysis. The antimicrobial activity of the obtained compounds was assessed in vitro against gram-positive Staphylococcus aureus and gram-negative Escherichia coli bacteria and Aspergillus flavus and Candida albicans fungi. All compounds exhibited good to excellent antimicrobial activity against the tested strains. Furthermore, a molecular docking study was carried out for the synthesized compounds and the results indicated that compounds 3b and 4b display comparable binding affinity scores as that of glutamate. These two compounds are promising candidates as antibacterial and antifungal agents that would deserve further investigations.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"352 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80062325","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}
I. Rubashvili, Natela Karukhnishvili, Khatuna Makharadze
The aim of this study was to develop and validate direct swab and indirect rinse sampling procedures and a high performance liquid chromatography (HPLC) method for simultaneous quantitative estimation of residues of active pharmaceutical ingredients (API) – lisinopril and hydrochlorothiazide (HCT) in cleaning control samples collected from pharmaceutical manufacturing equipment surfaces after manufacturing of lisinopril/hydrochlorothiazide 20/25 mg uncoated tablets. The swab and rinse sampling procedures were developed and validated in order to obtain a suitable and good recovery (>80%). The acceptance limits of the above-mentioned APIs on the manufacturing equipment surfaces have been established based on pharmacological and toxicological criteria. The new, rapid, specific and selective, developed HPLC method for simultaneous quantitative determination of lisinopril and HCT residues was validated with respect to robustness, system suitability test, specificity, linearity-range, precision, limits of detection and quantitation. The stability of APIs solutions and membrane filter compatibility were studied as well. The method validation was carried out according to ICH Q2 guideline and United States Pharamcopeia requirements. The limit of detection and the limit of quantitation for lisinopril were 0.039 μg/mL and 0.155 μg/mL and for HCT 0.012 μg/mL and 0.025 μg/mL, respectively.
{"title":"Simultaneous Quantitative Estimation of Lisinopril and Hydrochlorothiazide Residues Using HPLC for Cleaning Validation","authors":"I. Rubashvili, Natela Karukhnishvili, Khatuna Makharadze","doi":"10.19261/cjm.2020.669","DOIUrl":"https://doi.org/10.19261/cjm.2020.669","url":null,"abstract":"The aim of this study was to develop and validate direct swab and indirect rinse sampling procedures and a high performance liquid chromatography (HPLC) method for simultaneous quantitative estimation of residues of active pharmaceutical ingredients (API) – lisinopril and hydrochlorothiazide (HCT) in cleaning control samples collected from pharmaceutical manufacturing equipment surfaces after manufacturing of lisinopril/hydrochlorothiazide 20/25 mg uncoated tablets. The swab and rinse sampling procedures were developed and validated in order to obtain a suitable and good recovery (>80%). The acceptance limits of the above-mentioned APIs on the manufacturing equipment surfaces have been established based on pharmacological and toxicological criteria. The new, rapid, specific and selective, developed HPLC method for simultaneous quantitative determination of lisinopril and HCT residues was validated with respect to robustness, system suitability test, specificity, linearity-range, precision, limits of detection and quantitation. The stability of APIs solutions and membrane filter compatibility were studied as well. The method validation was carried out according to ICH Q2 guideline and United States Pharamcopeia requirements. The limit of detection and the limit of quantitation for lisinopril were 0.039 μg/mL and 0.155 μg/mL and for HCT 0.012 μg/mL and 0.025 μg/mL, respectively.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"5 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76399639","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}
Abstract. The level, composition, and distribution of hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethane (DDT) residues were determined by GC-ECD technique in soil samples from the Soroca district, Republic of Moldova. The concentrations of DDTs and HCHs were up to 1100 and 640 mg/kg, respectively. The obtained results indicated that in 77% of analysed soil samples the (DDE+DDD)/DDT ratios showed aged sources of DDT pollution, suggesting that in the studied area, the DDT residues have been transformed significantly into their degradation products. The α-HCH/γ-HCH ratios were generally high (in the range of 1-28) suggesting that technical HCH is the main source of contamination. The high concentration and the degradation rates of pesticides in soil suggest that the contaminated sites are acting as continuous sources of pollution for the environment.
{"title":"Organochlorine Pesticides Residues in Soil of Soroca District, Republic of Moldova","authors":"Elena Culighin","doi":"10.19261/cjm.2020.672","DOIUrl":"https://doi.org/10.19261/cjm.2020.672","url":null,"abstract":"Abstract. The level, composition, and distribution of hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethane (DDT) residues were determined by GC-ECD technique in soil samples from the Soroca district, Republic of Moldova. The concentrations of DDTs and HCHs were up to 1100 and 640 mg/kg, respectively. The obtained results indicated that in 77% of analysed soil samples the (DDE+DDD)/DDT ratios showed aged sources of DDT pollution, suggesting that in the studied area, the DDT residues have been transformed significantly into their degradation products. The α-HCH/γ-HCH ratios were generally high (in the range of 1-28) suggesting that technical HCH is the main source of contamination. The high concentration and the degradation rates of pesticides in soil suggest that the contaminated sites are acting as continuous sources of pollution for the environment.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"75 1","pages":"41-50"},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75884096","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}
O. Kazakova, R. Ivannikov, I. Laguta, O. Stavinskaya, V. Anishchenko, Olga Severinovska, L. Buyun
The aim of the work was to identify the main components of orchid extracts and to study their interaction with silica. Composition of sixteen orchid extracts was investigated by means of high performance liquid chromatography and laser desorption/ionization mass spectrometry; as it was shown in this study, flavonoids and phenolic acids were the main bioactive compounds available in the extracts. The interaction between various phenols and silica silanol groups was studied by quantum chemical method. Results show that the strength of interaction of phenols with silica increased in the following order: ferullic, feruloylquinic and fertaric acids< kaempferol, apingenin<< сhlorogenic and caffeic acids, rhamnetin, quercetin, luteolin, epicatechin gallate. The common feature of compounds characterized by the strongest interaction with silanol groups is the presence of a phenol ring with two neighbouring hydroxyl groups. The hydrogen bonds formed between these groups and silanol groups are much shorter (about 0.17 nm) than those formed by other hydroxyl groups of phenols (up to 0.28 nm).
{"title":"Chromatographic Analysis of Orchid Extracts and Quantum Chemical Calculations of Individual Components Interaction with Silica","authors":"O. Kazakova, R. Ivannikov, I. Laguta, O. Stavinskaya, V. Anishchenko, Olga Severinovska, L. Buyun","doi":"10.19261/cjm.2020.694","DOIUrl":"https://doi.org/10.19261/cjm.2020.694","url":null,"abstract":"The aim of the work was to identify the main components of orchid extracts and to study their interaction with silica. Composition of sixteen orchid extracts was investigated by means of high performance liquid chromatography and laser desorption/ionization mass spectrometry; as it was shown in this study, flavonoids and phenolic acids were the main bioactive compounds available in the extracts. The interaction between various phenols and silica silanol groups was studied by quantum chemical method. Results show that the strength of interaction of phenols with silica increased in the following order: ferullic, feruloylquinic and fertaric acids< kaempferol, apingenin<< сhlorogenic and caffeic acids, rhamnetin, quercetin, luteolin, epicatechin gallate. The common feature of compounds characterized by the strongest interaction with silanol groups is the presence of a phenol ring with two neighbouring hydroxyl groups. The hydrogen bonds formed between these groups and silanol groups are much shorter (about 0.17 nm) than those formed by other hydroxyl groups of phenols (up to 0.28 nm).","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"4 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87602977","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}
Lauro Figueroa, Alejandra Garcimarero, R. Garcia, Francisco Díaz, Marcela Rosas, Virginia Mateu, María I. López, Lenin Hau, Tomas Lopez, Abelardo Camacho, Yaritza Borges
Several studies for the synthesis of bicyclo[3.3.1]nonane analogues have been reported, however, there is little information on the preparation of bicyclo[3.3.1]nonane-steroid derivatives. In this way, the aim of this study was to synthesize two steroid-bicyclo[3.3.1]nonane analogues (11 or 12) from either estradiol or estrone using some reactions such as etherification, addition, nucleophilic substitution and cyclization. The chemical structure was evaluated through NMR spectroscopic analysis. The results showed higher yield for 11 compared with 12. It is noteworthy, that the reagents used in this investigation are not expensive and do not require special conditions for handling.
{"title":"Design and Synthesis of Two Bicyclo[3.3.1]nonane-steroid Derivatives","authors":"Lauro Figueroa, Alejandra Garcimarero, R. Garcia, Francisco Díaz, Marcela Rosas, Virginia Mateu, María I. López, Lenin Hau, Tomas Lopez, Abelardo Camacho, Yaritza Borges","doi":"10.19261/cjm.2019.657","DOIUrl":"https://doi.org/10.19261/cjm.2019.657","url":null,"abstract":"Several studies for the synthesis of bicyclo[3.3.1]nonane analogues have been reported, however, there is little information on the preparation of bicyclo[3.3.1]nonane-steroid derivatives. In this way, the aim of this study was to synthesize two steroid-bicyclo[3.3.1]nonane analogues (11 or 12) from either estradiol or estrone using some reactions such as etherification, addition, nucleophilic substitution and cyclization. The chemical structure was evaluated through NMR spectroscopic analysis. The results showed higher yield for 11 compared with 12. It is noteworthy, that the reagents used in this investigation are not expensive and do not require special conditions for handling.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"487 1","pages":"75-85"},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78125657","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}
A. Marcu, G. Lisa, I. Şofran, I. Anghel, M. Serban
This paper tackles the potential uses of agricultural wastes (sawdust, sunflower seed shells, pumpkin seed shells, cherry pits, walnut shells, and green walnut shells) for the production of pellets. Combustion heat was determined for these wastes and their thermal decomposition in an air atmosphere was analysed. Five types of mini-pellets were made from different combinations of available wastes and their thermal behaviour was analysed by the microscale combustion calorimetry method. The results were compared with those obtained for pellets available on the market and it was concluded that the mini-pellets obtained from agricultural wastes can be used to maintain combustion in heating systems based on pellets boilers.
{"title":"Evaluation of the Thermal Behaviour of Agricultural Wastes for Possible Use in the Biomass Pellets Industry","authors":"A. Marcu, G. Lisa, I. Şofran, I. Anghel, M. Serban","doi":"10.19261/cjm.2020.717","DOIUrl":"https://doi.org/10.19261/cjm.2020.717","url":null,"abstract":"This paper tackles the potential uses of agricultural wastes (sawdust, sunflower seed shells, pumpkin seed shells, cherry pits, walnut shells, and green walnut shells) for the production of pellets. Combustion heat was determined for these wastes and their thermal decomposition in an air atmosphere was analysed. Five types of mini-pellets were made from different combinations of available wastes and their thermal behaviour was analysed by the microscale combustion calorimetry method. The results were compared with those obtained for pellets available on the market and it was concluded that the mini-pellets obtained from agricultural wastes can be used to maintain combustion in heating systems based on pellets boilers.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"46 1","pages":"58-66"},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86342149","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}
Gismondine, laumontite and levyne type zeolites have been synthesized based on the natural minerals of Nakhchivan and the optimal crystallization conditions have been established. The influence of temperature, alkaline solution concentration, ratio of starting components and time of processing on the synthesis process has been studied. The mineral resources of Nakhchivan − halloysite deposits of Pirigel, dolomite deposits of Negram and obsidian deposits of Zangezur served as samples. The initial components and the reaction products have been examined by X-ray diffraction, thermogravimetric and elemental analysis. The optimal conditions for the synthesis of gismondine zeolite with a 100% crystallinity are as follows: temperature of 200°C, alkaline solution of 2 N NaOH, ratio of the initial components of halloysite (H):dolomite (D):obsidian (O)= 1:1:1, processing time of 50 hours. The optimal conditions for laumontite synthesis are: temperature of 220°C, alkaline solution of NaOH of 1 N, H:D:O= 1:3:1, processing time of 75 hours. The optimal conditions for levyne are: temperature of 200°C, alkaline solution of KOH of 4 N, H:D:O= 2:1:2, processing time of 100 hours. It was found that changes in the temperature, alkalinity, ratio of starting components and time of processing of the reaction have different effects on the rate of formation of products, on their degree of crystallinity and on the phase purity of the obtained zeolite.
以纳希切万天然矿物为原料，合成了吉斯蒙丁型、湖沸石型和利维安型沸石，并确定了最佳结晶条件。研究了温度、碱液浓度、起始组分配比、加工时间等因素对合成过程的影响。以piigel的Nakhchivan高岭石矿床、Negram的白云岩矿床和Zangezur的黑曜岩矿床为样品。用x射线衍射、热重和元素分析等方法对初始组分和反应产物进行了表征。合成结晶度为100%的gismondine沸石的最佳条件为:温度200℃，碱性溶液为2n NaOH，高岭石(H):白云石(D):黑曜石(O)的初始组分比= 1:1:1，处理时间50小时。合成沸石的最佳条件为:温度220℃，NaOH碱性溶液为1 N, H:D:O= 1:3:1，处理时间75小时。发酵的最佳条件为:温度200℃，KOH碱性溶液为4n, H:D:O= 2:1:2，处理时间100小时。结果表明，反应温度、碱度、起始组分配比和反应时间的变化对产物的形成速度、结晶度和所得沸石的相纯度有不同程度的影响。
{"title":"Synthesis of Different Structural Types of Zeolites in the Halloysite-dolomite-obsidian System","authors":"G. Mamedova","doi":"10.19261/cjm.2020.664","DOIUrl":"https://doi.org/10.19261/cjm.2020.664","url":null,"abstract":"Gismondine, laumontite and levyne type zeolites have been synthesized based on the natural minerals of Nakhchivan and the optimal crystallization conditions have been established. The influence of temperature, alkaline solution concentration, ratio of starting components and time of processing on the synthesis process has been studied. The mineral resources of Nakhchivan − halloysite deposits of Pirigel, dolomite deposits of Negram and obsidian deposits of Zangezur served as samples. The initial components and the reaction products have been examined by X-ray diffraction, thermogravimetric and elemental analysis. The optimal conditions for the synthesis of gismondine zeolite with a 100% crystallinity are as follows: temperature of 200°C, alkaline solution of 2 N NaOH, ratio of the initial components of halloysite (H):dolomite (D):obsidian (O)= 1:1:1, processing time of 50 hours. The optimal conditions for laumontite synthesis are: temperature of 220°C, alkaline solution of NaOH of 1 N, H:D:O= 1:3:1, processing time of 75 hours. The optimal conditions for levyne are: temperature of 200°C, alkaline solution of KOH of 4 N, H:D:O= 2:1:2, processing time of 100 hours. It was found that changes in the temperature, alkalinity, ratio of starting components and time of processing of the reaction have different effects on the rate of formation of products, on their degree of crystallinity and on the phase purity of the obtained zeolite.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"83 1","pages":"31-40"},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90355058","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}
D. Guglietta, G. Belardi, G. Cappai, B. Casentini, A. Godeas, S. Milia, D. Passeri, R. Salvatori, A. Scotti, V. Silvani, E. Tempesta, S. Ubaldini, Francesca Trapasso
Mining and mineral-processing wastes have been giving a lot of concern in recent times. This paper has evaluated an integrated multidisciplinary strategy for mining wastes characterization, their possible recycling and reuse, and critical raw materials recovery. After the in situ sampling campaigns, mining wastes have been characterized and the acquired mineralogical, chemical and spectral information have been used to create a map of mining waste deposits by means of the new multispectral satellite Sentinel-2A classification. The use of Fe-Mn rich wastes in arsenic removal and phosphorus recovery from water was discussed. Furthermore, mycorrhizal-assisted phytoextraction of metals from contaminated soils classified as Class 1 to 4 by remote sensing showed a good potential for their possible recovery from biomass, and results indicated that the system was suitable for the uptake of several elements. Results are encouraging and the application of such approach can be important to develop a circular model for sustainable exploitation of mining wastes.
{"title":"Toward a Multidisciplinary Strategy for the Classification and Reuse of Iron and Manganese Mining Wastes","authors":"D. Guglietta, G. Belardi, G. Cappai, B. Casentini, A. Godeas, S. Milia, D. Passeri, R. Salvatori, A. Scotti, V. Silvani, E. Tempesta, S. Ubaldini, Francesca Trapasso","doi":"10.19261/cjm.2019.650","DOIUrl":"https://doi.org/10.19261/cjm.2019.650","url":null,"abstract":"Mining and mineral-processing wastes have been giving a lot of concern in recent times. This paper has evaluated an integrated multidisciplinary strategy for mining wastes characterization, their possible recycling and reuse, and critical raw materials recovery. After the in situ sampling campaigns, mining wastes have been characterized and the acquired mineralogical, chemical and spectral information have been used to create a map of mining waste deposits by means of the new multispectral satellite Sentinel-2A classification. The use of Fe-Mn rich wastes in arsenic removal and phosphorus recovery from water was discussed. Furthermore, mycorrhizal-assisted phytoextraction of metals from contaminated soils classified as Class 1 to 4 by remote sensing showed a good potential for their possible recovery from biomass, and results indicated that the system was suitable for the uptake of several elements. Results are encouraging and the application of such approach can be important to develop a circular model for sustainable exploitation of mining wastes.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"39 1","pages":"21-30"},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76974563","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}
The concentrations of the accumulated heavy metals such as cadmium, lead, copper, mercury, zinc, and chromium have been determined in the muscles, gills and liver of the fish species of Clupea pallasii, Macolor niger and Pristipomoides filamentosus collected from the waters of the South Pacific Ocean around Lautoka in Fiji. Results of this study show the order of metal accumulation in tissues of all fishes as follows: Zn ˃Cu ˃ Cr ˃Cd ˃Pb ˃Hg. Overall, the contents of heavy metals in all the samples were below the permissible limits, except for chromium that is slightly higher than the limits of 0.15 mg/kg and 0.05 mg/kg set by Food and Agriculture Organization of the United Nations and World Health Organization regulations respectively. As anticipated, the muscles contain the lowest concentration of all metals. Significant variations in heavy metal concentrations were found between different tissues within each species of fish.
对从斐济劳托卡周围的南太平洋水域收集的黄颡鱼(Clupea pallasii)、黑鲭鱼(Macolor niger)和丝状拟鱼(pritipomoides filamentosus)的肌肉、鳃和肝脏中积累的镉、铅、铜、汞、锌和铬等重金属的浓度进行了测定。本研究结果表明，各鱼类组织中金属的富集顺序为:Zn - Cu - Cr - Cd - Pb - Hg。总体而言，除铬略高于联合国粮食及农业组织规定的0.15 mg/kg和世界卫生组织规定的0.05 mg/kg外，所有样品中的重金属含量均低于允许限量。正如预期的那样，肌肉中金属的浓度最低。在每种鱼类的不同组织之间发现了重金属浓度的显著差异。
{"title":"Analysis of Heavy Metal Accumulation in Fishes from the Coast of Lautoka, Fiji","authors":"S. S. Ghani, Aman Deo","doi":"10.19261/cjm.2020.701","DOIUrl":"https://doi.org/10.19261/cjm.2020.701","url":null,"abstract":"The concentrations of the accumulated heavy metals such as cadmium, lead, copper, mercury, zinc, and chromium have been determined in the muscles, gills and liver of the fish species of Clupea pallasii, Macolor niger and Pristipomoides filamentosus collected from the waters of the South Pacific Ocean around Lautoka in Fiji. Results of this study show the order of metal accumulation in tissues of all fishes as follows: Zn ˃Cu ˃ Cr ˃Cd ˃Pb ˃Hg. Overall, the contents of heavy metals in all the samples were below the permissible limits, except for chromium that is slightly higher than the limits of 0.15 mg/kg and 0.05 mg/kg set by Food and Agriculture Organization of the United Nations and World Health Organization regulations respectively. As anticipated, the muscles contain the lowest concentration of all metals. Significant variations in heavy metal concentrations were found between different tissues within each species of fish.","PeriodicalId":9922,"journal":{"name":"Chemistry Journal of Moldova","volume":"13 1","pages":"51-57"},"PeriodicalIF":0.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72452558","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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