Farzana Akter Kazi, Chen Zuliang, Smith Lester, Davey David, Naidu Ravi
Centre for Environmental Risk Assessment and Remediation, University of South Australia, Adelaide, SA 5095, Australia.
Talanta. 2005 Dec 15;68(2):406-15. doi: 10.1016/j.talanta.2005.09.011. Epub 2005 Oct 13.
The performance of capillary electrophoresis-ultraviolet detector (CE-UV), hydride generation-atomic absorption spectrometry (HG-AAS) and liquid chromatography-inductively coupled plasma mass spectrometry (LC-ICP-MS) have been compared for the speciation of arsenic (As) in groundwater samples. Two inorganic As species, arsenite (As(III)), arsenate (As(V)) and one organo species dimethyl arsenic acid (DMA) were mainly considered for this study as these are known to be predominant in water. Under optimal analytical conditions, limits of detection (LD) ranging from 0.10 (As(III), AsT) to 0.19 (DMA) mug/l for HG-AAS, 100 (As(III), DMA) to 500 (As(V)) mug/l for CE-UV and 0.1 (DMA, MMA) to 0.2 (As(III), As(V)) mug/l for LC-ICP-MS, allowed the determination of the above three species present in these samples. Results obtained by all the three methods are well correlated (r(2)=0.996*** for total As) with the precision of <5% R.S.D. except CE-UV. The effect of interfering ions (e.g. Fe(2+), Fe(3+), SO(4)(2-) and Cl(-)) commonly found in ground water on separation and estimation of As species were studied and corrected for. Spike recovery was tested and found to be 80-110% at 0.5mug/l As standard except CE-UV where only 50% of the analyte was recovered. Comparison of these results shows that LC-ICP-MS is the best choice for routine analysis of As species in ground water samples.
本文比较了毛细管电泳 - 紫外检测器（CE - UV）、氢化物发生 - 原子吸收光谱法（HG - AAS）和液相色谱 - 电感耦合等离子体质谱法（LC - ICP - MS）用于地下水样品中砷（As）形态分析的性能。本研究主要考虑了两种无机砷形态，亚砷酸盐（As(III)）、砷酸盐（As(V)）和一种有机形态二甲基砷酸（DMA），因为已知这些在水中占主导地位。在最佳分析条件下，HG - AAS的检测限（LD）范围为0.10（As(III)，AsT）至0.19（DMA）μg/l，CE - UV为100（As(III)，DMA）至500（As(V)）μg/l，LC - ICP - MS为0.1（DMA，MMA）至0.2（As(III)，As(V)）μg/l，这些检测限使得能够测定这些样品中存在的上述三种形态。除CE - UV外，所有三种方法获得的结果相关性良好（总砷的r(2)=0.996***），相对标准偏差（R.S.D.）<5%。研究并校正了地下水中常见的干扰离子（如Fe(2+)、Fe(3+)、SO(4)(2-)和Cl(-)）对砷形态分离和测定的影响。进行了加标回收率测试，发现除CE - UV外，在0.5μg/l As标准下回收率为80 - 110%，CE - UV仅回收了50%的分析物。这些结果的比较表明，LC - ICP - MS是地下水样品中砷形态常规分析的最佳选择。
