The aim of this study was to determine the source apportionment of dust fall around Lake Chini, Malaysia. Samples were collected monthly between December 2012 and March2013 at seven sampling stations located around La...The aim of this study was to determine the source apportionment of dust fall around Lake Chini, Malaysia. Samples were collected monthly between December 2012 and March2013 at seven sampling stations located around Lake Chini. The samples were filtered to separate the dissolved and undissolved solids. The ionic compositions（NO-3, SO2-4, Cl-and NH＋4） were determined using ion chromatography（IC） while major elements（K, Na, Ca and Mg） and trace metals（Zn, Fe, Al, Ni, Mn, Cr, Pb and Cd） were determined using inductively coupled plasma mass spectrometry（ICP-MS）. The results showed that the average concentration of total solids around Lake Chini was 93.49 ± 16.16 mg/（m2·day）. SO2-4, Na and Zn dominated the dissolved portion of the dust fall. The enrichment factors（EF） revealed that the source of the trace metals and major elements in the rain water was anthropogenic, except for Fe. Hierarchical agglomerative cluster analysis（HACA） classified the seven monitoring stations and 16 variables into five groups and three groups respectively. A coupled receptor model, principal component analysis multiple linear regression（PCA-MLR）, revealed that the sources of dust fall in Lake Chini were dominated by agricultural and biomass burning（42%）,followed by the earth＇s crust（28%）, sea spray（16%） and a mixture of soil dust and vehicle emissions（14%）.展开更多
目的:提出了一种用离子色谱测定浓硝酸组分及含量的方法。方法:采用MIC-7型离子色谱仪,METROSEP A Supp16高容量阴离子分离柱;25mmol NaOH+3mmol Na2CO3的淋洗液;进样体积10μL;流速0.8mL/min,F-和Cl-的保留时间分别为4.8min和7.0min。...目的:提出了一种用离子色谱测定浓硝酸组分及含量的方法。方法:采用MIC-7型离子色谱仪,METROSEP A Supp16高容量阴离子分离柱;25mmol NaOH+3mmol Na2CO3的淋洗液;进样体积10μL;流速0.8mL/min,F-和Cl-的保留时间分别为4.8min和7.0min。结果:三点标准曲线线性相关性良好,相关系数为0.99968和0.99979,3次重复进样结果表明此法测定F-,Cl-的相对标准偏差分别为1.1%和0.1%。讨论:可以实现F-和Cl-在大量硝酸基体下的完全分离。展开更多
基金the Malaysian Ministry of Higher Education for funding via Fundamental Research Grants (UKMTOPDOWN-ST-08-FRGS0003-2010 and FRGS/1/ 2013/SPWN01/UKM/02/)
文摘The aim of this study was to determine the source apportionment of dust fall around Lake Chini, Malaysia. Samples were collected monthly between December 2012 and March2013 at seven sampling stations located around Lake Chini. The samples were filtered to separate the dissolved and undissolved solids. The ionic compositions（NO-3, SO2-4, Cl-and NH＋4） were determined using ion chromatography（IC） while major elements（K, Na, Ca and Mg） and trace metals（Zn, Fe, Al, Ni, Mn, Cr, Pb and Cd） were determined using inductively coupled plasma mass spectrometry（ICP-MS）. The results showed that the average concentration of total solids around Lake Chini was 93.49 ± 16.16 mg/（m2·day）. SO2-4, Na and Zn dominated the dissolved portion of the dust fall. The enrichment factors（EF） revealed that the source of the trace metals and major elements in the rain water was anthropogenic, except for Fe. Hierarchical agglomerative cluster analysis（HACA） classified the seven monitoring stations and 16 variables into five groups and three groups respectively. A coupled receptor model, principal component analysis multiple linear regression（PCA-MLR）, revealed that the sources of dust fall in Lake Chini were dominated by agricultural and biomass burning（42%）,followed by the earth＇s crust（28%）, sea spray（16%） and a mixture of soil dust and vehicle emissions（14%）.
文摘目的:提出了一种用离子色谱测定浓硝酸组分及含量的方法。方法:采用MIC-7型离子色谱仪,METROSEP A Supp16高容量阴离子分离柱;25mmol NaOH+3mmol Na2CO3的淋洗液;进样体积10μL;流速0.8mL/min,F-和Cl-的保留时间分别为4.8min和7.0min。结果:三点标准曲线线性相关性良好,相关系数为0.99968和0.99979,3次重复进样结果表明此法测定F-,Cl-的相对标准偏差分别为1.1%和0.1%。讨论:可以实现F-和Cl-在大量硝酸基体下的完全分离。
