Preservation strategies for inorganic arsenic species in high iron, low-Eh groundwater from West Bengal, India

被引:66
作者
Gault, AG
Jana, J
Chakraborty, S
Mukherjee, P
Sarkar, M
Nath, B
Polya, DA
Chatterjee, D [1 ]
机构
[1] Univ Kalyani, Dept Chem, Kalyani 741235, W Bengal, India
[2] Univ Manchester, Dept Earth Sci, Manchester M13 9PL, Lancs, England
[3] Univ Manchester, Williamson Res Ctr Mol Environm Sci, Manchester M13 9PL, Lancs, England
基金
英国工程与自然科学研究理事会;
关键词
IC-ICP-MS; arsenic; speciation; preservation; groundwater;
D O I
10.1007/s00216-004-2861-1
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Despite the importance of accurately determining inorganic arsenic speciation in natural waters to predicting bioavailability and environmental and health impacts, there remains considerable debate about the most appropriate species preservation strategies to adopt. In particular, the high-iron, low-Eh ( redox potential) shallow groundwaters in West Bengal, Bangladesh and SE Asia, the use of which for drinking and irrigation purposes has led to massive international concerns for human health, are particularly prone to changes in arsenic speciation after sampling. The e. effectiveness of HCl and EDTA preservation strategies has been compared and used on variably arsenic-rich West Bengali groundwater samples, analysed by ion chromatography-inductively coupled plasma-mass spectrometry (IC-ICP-MS). Immediate filtration and acidification with HCl followed by refrigerated storage was found to be the most effective strategy for minimizing the oxidation of inorganic As( III) during storage. The use of a PRP-X100 (Hamilton) column with a 20 mmol L-1 NH4H2PO4 as mobile phase enabled the separation of Cl- from As( III), monomethylarsonic acid, dimethylarsinic acid and As( V), thereby eliminating any isobaric interference between (ArCl+)-Ar-40-Cl-35 and As-75(+). The use of EDTA as a preservative, whose action is impaired by the high calcium concentrations typical of these types of groundwater, resulted in marked oxidation during storage. The use of HCl is therefore indicated for analytical methods in which chloride-rich matrices are not problematical. The groundwaters analysed by IC-ICP-MS were found to contain between 5 and 770 ng As mL(-1) exclusively as inorganic arsenic species. As( III)/total-As varied between 0 and 0.94.
引用
收藏
页码:347 / 353
页数:7
相关论文
共 55 条
[1]   THE EXTENT OF FORMATION OF ARSENIC(III) IN SEDIMENT INTERSTITIAL WATERS AND ITS RELEASE TO HYPOLIMNETIC WATERS IN LAKE OHAKURI [J].
AGGETT, J ;
KRIEGMAN, MR .
WATER RESEARCH, 1988, 22 (04) :407-411
[2]  
[Anonymous], 440F US GEOL SURV
[3]  
Appelo C.A.J., 2004, Groundw. Pollut.
[4]  
Ariza JLG, 2000, TRAC-TREND ANAL CHEM, V19, P200
[5]  
Bandyopadhyay RK, 2002, J GEOL SOC INDIA, V59, P33
[6]   Preserving the distribution of inorganic arsenic species in groundwater and acid mine drainage samples [J].
Bednar, AJ ;
Garbarino, JR ;
Ranville, JF ;
Wildeman, TR .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2002, 36 (10) :2213-2218
[7]   Arsenic contamination of groundwater and drinking water in Vietnam: A human health threat [J].
Berg, M ;
Tran, HC ;
Nguyen, TC ;
Pham, HV ;
Schertenleib, R ;
Giger, W .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2001, 35 (13) :2621-2626
[8]   Groundwater As mobilization in the Bengal Delta Plain, the use of ferralite as a possible remedial measure - a case study [J].
Bhattacharyya, R ;
Jana, J ;
Nath, B ;
Sahu, SJ ;
Chatterjee, D ;
Jacks, G .
APPLIED GEOCHEMISTRY, 2003, 18 (09) :1435-1451
[9]   High arsenic groundwater: Mobilization, metabolism and mitigation - an overview in the Bengal Delta Plain [J].
Bhattacharyya, R ;
Chatterjee, D ;
Nath, B ;
Jana, J ;
Jacks, G ;
Vahter, M .
MOLECULAR AND CELLULAR BIOCHEMISTRY, 2003, 253 (1-2) :347-355
[10]  
CANCES B, 2004, GOLDSCHMIDT 2004