Malaysian Journal of Analytical Science最新文献

HYDROGEN SORPTION OF MAGNESIUM OXIDE CARBON NANOFIBRE COMPOSITE 氧化镁碳纳米纤维复合材料的吸氢性能

Malaysian Journal of Analytical Science Pub Date : 2019-02-24 DOI: 10.17576/mjas-2019-2301-08

引用次数: 5

A NEW ULTRA VIOLET-VISIBLE SPECTROPHOTOMETRIC METHOD FOR QUANTITATIVE DETERMINATION OF ACRYLAMIDE VIA HYDROLYSIS PROCESS 建立了水解丙烯酰胺的紫外可见分光光度定量测定新方法

Malaysian Journal of Analytical Science Pub Date : 2019-02-24 DOI: 10.17576/mjas-2019-2301-02

引用次数: 1

MENGKUANG FIBER REINFORCED THERMOPLASTIC NATURAL RUBBER COMPOSITES: INFLUENCE OF RUBBER CONTENT ON MECHANICAL PROPERTIES AND MORPHOLOGY 蒙矿纤维增强热塑性天然橡胶复合材料:橡胶含量对力学性能和形貌的影响

Malaysian Journal of Analytical Science Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-19

引用次数: 1

BIOACCESSIBILITY ASSESSMENT OF 232Th AND 238U FROM LANTHANIDE CONCENTRATE AND WATER LEACH PURIFICATION RESIDUE IN MALAYSIA 马来西亚镧系精矿和水浸净化渣中232和238U的生物可及性评价

Malaysian Journal of Analytical Science Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-07

Malaysian Journal, Nur Shahidah Abdul Rashid, Y. M. I. Perama

{"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}

引用次数: 0

LIQUID NATURAL RUBBER TOUGHENED POLY(LACTIC ACID) BLEND: EFFECTS OF COMPATIBILIZER TYPES AND LOADINGS ON THERMO-MECHANICAL PROPERTIES 液体天然橡胶增韧聚乳酸共混物:增容剂种类及用量对热机械性能的影响

Malaysian Journal of Analytical Science Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-16

Mohd Farid Hakim Mohd Ruf, S. Ahmad, Ruey Shan Chen, Dalila Shahdan, Farrah Diyana Zailan

{"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}

引用次数: 1

SYNTHESIS, CHARACTERISATION AND EFFECT OF TEMPERATURE ON CORROSION INHIBITION BY THIOSEMICARBAZONE DERIVATIVES AND ITS TIN(IV) COMPLEXES 硫代氨基脲衍生物及其锡配合物的合成、表征及温度对其缓蚀性能的影响

Malaysian Journal of Analytical Science Pub Date : 2018-10-25 DOI: 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,

{"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}

引用次数: 1

EFFECT OF GOLD SOLUTION CONCENTRATION ON THE FORMATION AND PHOTOELECTROCHEMICAL PROPERTIES OF GOLD DEPOSITED TITANIUM DIOXIDE NANOTUBES 金溶液浓度对金沉积二氧化钛纳米管形成及光电化学性质的影响

Malaysian Journal of Analytical Science Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-02

引用次数: 0

FABRICATION OF CELLULOSE MICROSPHERES FROM MODIFIED COTTON LINTER AND OIL PALM TRUNK FIBRE VIA EMULSION METHOD 以改性棉纱和油棕干纤维为原料，乳液法制备纤维素微球

Malaysian Journal of Analytical Science Pub Date : 2018-10-25 DOI: 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

{"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}

引用次数: 0

DETERMINATION OF NATURAL RADIOACTIVITY AND HEAVY METALS AT THE FORMER MINING SITE OF KOLEJ UNIVERSITI ISLAM ANTARABANGSA SELANGOR (KUIS) LAKE 雪兰莪(kuis)湖前kolej universiti Islam antarabangsa lake矿区天然放射性和重金属的测定

Malaysian Journal of Analytical Science Pub Date : 2018-10-01 DOI: 10.17576/MJAS-2018-2205-10

N. A. M. Radzali, Norsyahidah Mohd Hidzir, Irman Abdul Rahman

{"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}

引用次数: 3

FILLER AND POLYMER INTERACTIONS IN POLYMETHYL METHACRYLATE/50% EPOXIDIZED NATURAL RUBBER/SILICON DIOXIDE NANOCOMPOSITES 聚甲基丙烯酸甲酯/50%环氧化天然橡胶/二氧化硅纳米复合材料中填料与聚合物的相互作用

Malaysian Journal of Analytical Science Pub Date : 2018-08-16 DOI: 10.17576/mjas-2018-2204-03

引用次数: 1