Pub Date : 2019-02-24DOI: 10.17576/mjas-2019-2301-08
Carbon nanofibres have high specific surface area to adsorb hydrogen on their surface and are widely investigated for hydrogen storage. Although carbon nanofibres can store a considerable amount of hydrogen, the adsorption of the latter must be conducted at cryogenic conditions. Here, MgO is proposed as a catalyst to improve the hydrogen storage performance of carbon nanofibres at room temperature because of the light weight MgO and its ability to dissociate hydrogen molecules. The magnesium oxide– carbon nanofibre (MgO–CNF) composite was prepared with polivinylpyrrolidone polymer and MgO via an electrospinner. The samples were characterised with field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and microgravimetric analysis. The MgO particles were formed on the surface and embedded inside the MgO–CNFs, thereby increasing the specific surface area. The assynthesised MgO–CNFs with a specific surface area of 547 m/g can store 2.54 wt.% of hydrogen at room temperature, showing more than 30% improvement as compared with that of CNFs.
{"title":"HYDROGEN SORPTION OF MAGNESIUM OXIDE CARBON NANOFIBRE COMPOSITE","authors":"","doi":"10.17576/mjas-2019-2301-08","DOIUrl":"https://doi.org/10.17576/mjas-2019-2301-08","url":null,"abstract":"Carbon nanofibres have high specific surface area to adsorb hydrogen on their surface and are widely investigated for hydrogen storage. Although carbon nanofibres can store a considerable amount of hydrogen, the adsorption of the latter must be conducted at cryogenic conditions. Here, MgO is proposed as a catalyst to improve the hydrogen storage performance of carbon nanofibres at room temperature because of the light weight MgO and its ability to dissociate hydrogen molecules. The magnesium oxide– carbon nanofibre (MgO–CNF) composite was prepared with polivinylpyrrolidone polymer and MgO via an electrospinner. The samples were characterised with field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and microgravimetric analysis. The MgO particles were formed on the surface and embedded inside the MgO–CNFs, thereby increasing the specific surface area. The assynthesised MgO–CNFs with a specific surface area of 547 m/g can store 2.54 wt.% of hydrogen at room temperature, showing more than 30% improvement as compared with that of CNFs.","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74839354","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 : 2019-02-24DOI: 10.17576/mjas-2019-2301-02
{"title":"A NEW ULTRA VIOLET-VISIBLE SPECTROPHOTOMETRIC METHOD FOR QUANTITATIVE DETERMINATION OF ACRYLAMIDE VIA HYDROLYSIS PROCESS","authors":"","doi":"10.17576/mjas-2019-2301-02","DOIUrl":"https://doi.org/10.17576/mjas-2019-2301-02","url":null,"abstract":"","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85535357","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 : 2018-10-25DOI: 10.17576/mjas-2018-2205-07
Malaysian Journal, Nur Shahidah Abdul Rashid, Y. M. I. Perama
The aim of this case study was to estimate the bioaccessibility of Th and U from lanthanide concentrate (LC) and water leach purification (WLP) residue of Lynas Advanced Materials Plant by analysing the solubility of these radionuclides in synthetic gastrointestinal fluids. A DIN in vitro bioaccessibility method was applied to determine the targeted radionuclides from the LC and WLP residue, which were further evaluated through inductively coupled plasma mass spectrometry. Th and U concentrations in the gastrointestinal fluids portrayed the maximum amount of contaminants that were potentially available for intestinal absorption and transfer into the blood. The maximum concentrations of Th in the LC and WLP residue were 0.1410 ± 0.0331 mg kg and 0.1621 ± 0.1190 mg kg, respectively. As for U in the LC and WLP residue during the intestinal phase for high-risk cases, the maximum concentrations were 0.0558 ± 0.0164 mg kg and 0.0480 ± 0.0213 mg kg, respectively. The maximum bioaccessibility of Th and U was 0.14 % and 0.93 %, respectively. Based on the assessment, the committed equivalent dose and committed effective dose of Th and U were below the United Nations Scientific Committee on the Effects of Atomic Radiation reference values. Overall, the DIN in vitro bioaccessibility method is feasible to estimate the solubility of Th and U from LC and WLP residue, and is also useful for monitoring and risk assessment purposes for environmental, health, and contaminated samples.
{"title":"BIOACCESSIBILITY ASSESSMENT OF 232Th AND 238U FROM LANTHANIDE CONCENTRATE AND WATER LEACH PURIFICATION RESIDUE IN MALAYSIA","authors":"Malaysian Journal, Nur Shahidah Abdul Rashid, Y. M. I. Perama","doi":"10.17576/mjas-2018-2205-07","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-07","url":null,"abstract":"The aim of this case study was to estimate the bioaccessibility of Th and U from lanthanide concentrate (LC) and water leach purification (WLP) residue of Lynas Advanced Materials Plant by analysing the solubility of these radionuclides in synthetic gastrointestinal fluids. A DIN in vitro bioaccessibility method was applied to determine the targeted radionuclides from the LC and WLP residue, which were further evaluated through inductively coupled plasma mass spectrometry. Th and U concentrations in the gastrointestinal fluids portrayed the maximum amount of contaminants that were potentially available for intestinal absorption and transfer into the blood. The maximum concentrations of Th in the LC and WLP residue were 0.1410 ± 0.0331 mg kg and 0.1621 ± 0.1190 mg kg, respectively. As for U in the LC and WLP residue during the intestinal phase for high-risk cases, the maximum concentrations were 0.0558 ± 0.0164 mg kg and 0.0480 ± 0.0213 mg kg, respectively. The maximum bioaccessibility of Th and U was 0.14 % and 0.93 %, respectively. Based on the assessment, the committed equivalent dose and committed effective dose of Th and U were below the United Nations Scientific Committee on the Effects of Atomic Radiation reference values. Overall, the DIN in vitro bioaccessibility method is feasible to estimate the solubility of Th and U from LC and WLP residue, and is also useful for monitoring and risk assessment purposes for environmental, health, and contaminated samples.","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89758393","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 : 2018-10-25DOI: 10.17576/mjas-2018-2205-16
Mohd Farid Hakim Mohd Ruf, S. Ahmad, Ruey Shan Chen, Dalila Shahdan, Farrah Diyana Zailan
This research was carried out to investigate the addition of grafted copolymers of maleic anhydride grafted-polylactic acid (PLAg-MA) and maleic anhydride grafted-natural rubber (NR-g-MA) on the mechanical and thermal properties of polylactic acid/ liquid natural rubber (PLA/LNR) blends. Prior to blend preparation, the PLA-g-MA and NR-g-MA were the first selfsynthesized by mixing maleic anhydride (MA) and dicumyl peroxide (DCP) which acted as initiator with the PLA and natural rubber (NR), respectively. The PLA/LNR, PLA/LNR/PLA-g-MA and PLA/LNR/NR-g-MA blends were prepared via meltblending method. The loading of PLA-g-MA and NR-g-MA was varied between 5, 10 and 15%, respectively. By comparing to the control sample (neat PLA/LNR blend), the addition of PLA-g-MA with 5 and 10% led to increment in tensile strength up to 22 MPa, whereas NR-g-MA promoted a negative trend of tensile properties to the blends. Differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA) results showed the enhanced thermal stability for PLA/LNR/PLA-g-MA blend. Fourier transform infrared (FTIR) analysis confirmed the chemical interaction between the PLA and NR components where the grafted copolymers were successfully grafted onto PLA backbone and bonded with NR.
{"title":"LIQUID NATURAL RUBBER TOUGHENED POLY(LACTIC ACID) BLEND: EFFECTS OF COMPATIBILIZER TYPES AND LOADINGS ON THERMO-MECHANICAL PROPERTIES","authors":"Mohd Farid Hakim Mohd Ruf, S. Ahmad, Ruey Shan Chen, Dalila Shahdan, Farrah Diyana Zailan","doi":"10.17576/mjas-2018-2205-16","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-16","url":null,"abstract":"This research was carried out to investigate the addition of grafted copolymers of maleic anhydride grafted-polylactic acid (PLAg-MA) and maleic anhydride grafted-natural rubber (NR-g-MA) on the mechanical and thermal properties of polylactic acid/ liquid natural rubber (PLA/LNR) blends. Prior to blend preparation, the PLA-g-MA and NR-g-MA were the first selfsynthesized by mixing maleic anhydride (MA) and dicumyl peroxide (DCP) which acted as initiator with the PLA and natural rubber (NR), respectively. The PLA/LNR, PLA/LNR/PLA-g-MA and PLA/LNR/NR-g-MA blends were prepared via meltblending method. The loading of PLA-g-MA and NR-g-MA was varied between 5, 10 and 15%, respectively. By comparing to the control sample (neat PLA/LNR blend), the addition of PLA-g-MA with 5 and 10% led to increment in tensile strength up to 22 MPa, whereas NR-g-MA promoted a negative trend of tensile properties to the blends. Differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA) results showed the enhanced thermal stability for PLA/LNR/PLA-g-MA blend. Fourier transform infrared (FTIR) analysis confirmed the chemical interaction between the PLA and NR components where the grafted copolymers were successfully grafted onto PLA backbone and bonded with NR.","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76318724","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 : 2018-10-25DOI: 10.17576/mjas-2018-2205-03
Malaysian Journal, Pencirian dan Kesan, Suhu Ke atas Perencatan, Kakisan oleh Ligan Terbitan, Nur Nadira Hazani, N. Dzulkifli, Ahmad Izaddin Sheikh, M. Ghazali, Y. Farina,
Thiosemicarbazone derivatives and its tin(IV) complexes used in this study were 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc), 2-acetylpyridine 4-methyl-3-thiosemicarbazone (HAcMTSc), 2-acetylpyridine 4-ethyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcETSc)PhenCl2), and 2-acetylpyridine 4-methyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcMTSc)PhenCl2). All these title compounds were characterised using an elemental analyser, Fourier-transform infraredattenuated total reflectance spectroscopy (FTIR-ATR), ultraviolet-visible spectroscopy (UV-Vis), and nuclear magnetic resonance (NMR). The efficiency of the synthesised compounds as a corrosion inhibitor of mild steel in 1.0 M HCl was investigated using weight loss technique at different concentrations, 1, 2, and 3 mM, and at a temperature range of 30–60 °C. The thiosemicarbazone ligand and its tin(IV) complexes affirmed the hypothesis where the inhibitor efficiency tends to increase as the inhibitor concentration increases, indicating their potential use as a corrosion inhibitor for mild steel. Moreover, inhibitor efficiency decreases when temperature increases.
硫代氨基脲衍生物及其锡(IV)配合物为2-乙酰吡啶- 4-乙基-3-硫代氨基脲(HAcETSc)、2-乙酰吡啶- 4-甲基-3-硫代氨基脲(HAcMTSc)、2-乙酰吡啶- 4-乙基-3-硫代氨基脲二氯苯锡(Sn(HAcETSc)PhenCl2)和2-乙酰吡啶- 4-甲基-3-硫代氨基脲二氯苯锡(Sn(HAcMTSc)PhenCl2)。所有这些标题化合物都使用元素分析仪，傅里叶变换红外衰减全反射光谱(FTIR-ATR)，紫外可见光谱(UV-Vis)和核磁共振(NMR)进行了表征。在30-60℃的温度范围内，采用失重法研究了所合成的化合物在1.0 M HCl中作为低碳钢缓蚀剂的效率，其浓度分别为1、2和3 mM。硫代氨基脲配体及其锡(IV)配合物证实了缓蚀剂效率随着缓蚀剂浓度的增加而增加的假设，表明它们作为低碳钢缓蚀剂的潜在用途。随着温度的升高，缓蚀剂的效率降低。
{"title":"SYNTHESIS, CHARACTERISATION AND EFFECT OF TEMPERATURE ON CORROSION INHIBITION BY THIOSEMICARBAZONE DERIVATIVES AND ITS TIN(IV) COMPLEXES","authors":"Malaysian Journal, Pencirian dan Kesan, Suhu Ke atas Perencatan, Kakisan oleh Ligan Terbitan, Nur Nadira Hazani, N. Dzulkifli, Ahmad Izaddin Sheikh, M. Ghazali, Y. Farina,","doi":"10.17576/mjas-2018-2205-03","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-03","url":null,"abstract":"Thiosemicarbazone derivatives and its tin(IV) complexes used in this study were 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc), 2-acetylpyridine 4-methyl-3-thiosemicarbazone (HAcMTSc), 2-acetylpyridine 4-ethyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcETSc)PhenCl2), and 2-acetylpyridine 4-methyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcMTSc)PhenCl2). All these title compounds were characterised using an elemental analyser, Fourier-transform infraredattenuated total reflectance spectroscopy (FTIR-ATR), ultraviolet-visible spectroscopy (UV-Vis), and nuclear magnetic resonance (NMR). The efficiency of the synthesised compounds as a corrosion inhibitor of mild steel in 1.0 M HCl was investigated using weight loss technique at different concentrations, 1, 2, and 3 mM, and at a temperature range of 30–60 °C. The thiosemicarbazone ligand and its tin(IV) complexes affirmed the hypothesis where the inhibitor efficiency tends to increase as the inhibitor concentration increases, indicating their potential use as a corrosion inhibitor for mild steel. Moreover, inhibitor efficiency decreases when temperature increases.","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80028700","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 : 2018-10-25DOI: 10.17576/mjas-2018-2205-02
{"title":"EFFECT OF GOLD SOLUTION CONCENTRATION ON THE FORMATION AND PHOTOELECTROCHEMICAL PROPERTIES OF GOLD DEPOSITED TITANIUM DIOXIDE NANOTUBES","authors":"","doi":"10.17576/mjas-2018-2205-02","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-02","url":null,"abstract":"","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76769113","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 : 2018-10-25DOI: 10.17576/mjas-2018-2205-20
Malaysian Journal, Fabrikasi Mikrosfera Selulosa, daripada Linter, Kapas dan Gentian Batang, Kelapa Sawit, Termodifikasi Melalui, Kaedah Emulsi, Nurul Shuhadah Mahadi, M. Nizam, S. Zakaria, M. F. Daud, Sharifah Nabihah Syed Jaafar
In this study, cellulose microspheres from modified cotton linter (CL) and oil palm trunk fibre (OPTF) were fabricated by using simple emulsion method. The cellulose was obtained from the CL and OPTF through the alkaline pre-treatment and acid hydrolysis processes. The emulsion method was performed using polyvinyl alcohol (PVA) as an emulsifying agent. The characterization of the cellulose from CL and OPTF were analysed using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), and the morphological characterizations of cellulose microspheres were later observed under optical microscopy (OM) and field emission-scanning electron microscopy (FE-SEM). Based on the results, FTIR spectra displayed the lignin and hemicellulose had removed after treatments, while XRD revealed that the crystallinity index of OPTF and CL was increased after the treatments. The microspheres, formed with different ranges of size between 80 to 150 μm under OM and FESEM, showed the formation of pores on the surface of the microspheres.
{"title":"FABRICATION OF CELLULOSE MICROSPHERES FROM MODIFIED COTTON LINTER AND OIL PALM TRUNK FIBRE VIA EMULSION METHOD","authors":"Malaysian Journal, Fabrikasi Mikrosfera Selulosa, daripada Linter, Kapas dan Gentian Batang, Kelapa Sawit, Termodifikasi Melalui, Kaedah Emulsi, Nurul Shuhadah Mahadi, M. Nizam, S. Zakaria, M. F. Daud, Sharifah Nabihah Syed Jaafar","doi":"10.17576/mjas-2018-2205-20","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-20","url":null,"abstract":"In this study, cellulose microspheres from modified cotton linter (CL) and oil palm trunk fibre (OPTF) were fabricated by using simple emulsion method. The cellulose was obtained from the CL and OPTF through the alkaline pre-treatment and acid hydrolysis processes. The emulsion method was performed using polyvinyl alcohol (PVA) as an emulsifying agent. The characterization of the cellulose from CL and OPTF were analysed using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), and the morphological characterizations of cellulose microspheres were later observed under optical microscopy (OM) and field emission-scanning electron microscopy (FE-SEM). Based on the results, FTIR spectra displayed the lignin and hemicellulose had removed after treatments, while XRD revealed that the crystallinity index of OPTF and CL was increased after the treatments. The microspheres, formed with different ranges of size between 80 to 150 μm under OM and FESEM, showed the formation of pores on the surface of the microspheres.","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87308881","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 : 2018-10-01DOI: 10.17576/MJAS-2018-2205-10
N. A. M. Radzali, Norsyahidah Mohd Hidzir, Irman Abdul Rahman
An ex-mining site has created an undesirable effect on the environment, such as the destruction of plants and contamination. Thus, this study was conducted to determine the natural radioactivity and heavy metal presence in the ex-mining site at Kolej University Islam Antarabangsa Selangor (KUIS) lake. Both parameters were measured using gamma spectrometry and inductively coupled plasma-mass spectrometry (ICP-MS). The results showed that the concentrations of U (0.44 ± 0.31 Bq/L), Th (0.04 ± 0.02 Bq/L), 226 Ra (0.19 ± 0.11 Bq/L), and K (0.62 ± 0.37 Bq/L) in water samples were below the recommended values by the World Health Organization (WHO) for drinking water source, which implied the safe consumption of the water. However, the presence of U, Th, 226 Ra, and K in sediment samples exceeded the limit proposed by UNSCEAR, with the radioactivity of 49.1 ± 18.8 Bq/kg, 102.3 ± 3.3 Bq/kg, 133.2 ± 18.8 Bq/kg, and 297.1 ± 25.7 Bq/kg, respectively. For heavy metal determination, zinc was found in the sediment with the highest concentration (17.34 ± 15.79 mg/kg) compared to other heavy metals, while the concentration of arsenic was highest in water with 0.58 ± 0.26 μg/L. All hazard indices were found to be below the safety limit except for the gamma index of 1.6 ± 0.7 Bq/kg and 104.1 ± 48.4 nGy/h for the gamma dose rate.
一个前矿区对环境造成了不良影响，例如破坏植物和污染。因此，本研究旨在确定Kolej University Islam Antarabangsa Selangor (KUIS)湖前矿区的天然放射性和重金属存在。采用伽马能谱法和电感耦合等离子体质谱法(ICP-MS)测量这两个参数。结果表明，水样中U(0.44±0.31 Bq/L)、Th(0.04±0.02 Bq/L)、226 Ra(0.19±0.11 Bq/L)和K(0.62±0.37 Bq/L)的浓度均低于世界卫生组织(WHO)饮用水水源推荐值，可安全饮用。沉积物样品中U、Th、226 Ra和K的放射性分别为49.1±18.8 Bq/kg、102.3±3.3 Bq/kg、133.2±18.8 Bq/kg和297.1±25.7 Bq/kg，超出了UNSCEAR建议的限量。重金属测定中，沉积物中锌含量最高，为17.34±15.79 mg/kg，水中砷含量最高，为0.58±0.26 μg/L。除γ剂量率的γ指数为1.6±0.7 Bq/kg和104.1±48.4 nGy/h外，其他危害指标均低于安全限值。
{"title":"DETERMINATION OF NATURAL RADIOACTIVITY AND HEAVY METALS AT THE FORMER MINING SITE OF KOLEJ UNIVERSITI ISLAM ANTARABANGSA SELANGOR (KUIS) LAKE","authors":"N. A. M. Radzali, Norsyahidah Mohd Hidzir, Irman Abdul Rahman","doi":"10.17576/MJAS-2018-2205-10","DOIUrl":"https://doi.org/10.17576/MJAS-2018-2205-10","url":null,"abstract":"An ex-mining site has created an undesirable effect on the environment, such as the destruction of plants and contamination. Thus, this study was conducted to determine the natural radioactivity and heavy metal presence in the ex-mining site at Kolej University Islam Antarabangsa Selangor (KUIS) lake. Both parameters were measured using gamma spectrometry and inductively coupled plasma-mass spectrometry (ICP-MS). The results showed that the concentrations of U (0.44 ± 0.31 Bq/L), Th (0.04 ± 0.02 Bq/L), 226 Ra (0.19 ± 0.11 Bq/L), and K (0.62 ± 0.37 Bq/L) in water samples were below the recommended values by the World Health Organization (WHO) for drinking water source, which implied the safe consumption of the water. However, the presence of U, Th, 226 Ra, and K in sediment samples exceeded the limit proposed by UNSCEAR, with the radioactivity of 49.1 ± 18.8 Bq/kg, 102.3 ± 3.3 Bq/kg, 133.2 ± 18.8 Bq/kg, and 297.1 ± 25.7 Bq/kg, respectively. For heavy metal determination, zinc was found in the sediment with the highest concentration (17.34 ± 15.79 mg/kg) compared to other heavy metals, while the concentration of arsenic was highest in water with 0.58 ± 0.26 μg/L. All hazard indices were found to be below the safety limit except for the gamma index of 1.6 ± 0.7 Bq/kg and 104.1 ± 48.4 nGy/h for the gamma dose rate.","PeriodicalId":18025,"journal":{"name":"Malaysian Journal of Analytical Science","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75842438","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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