Spatial variability of arsenic in 6000 tube wells in a 25 km2 area of Bangladesh -: art. no. 1140

被引:318
作者
van Geen, A [1 ]
Zheng, Y
Versteeg, R
Stute, M
Horneman, A
Dhar, R
Steckler, M
Gelman, A
Small, C
Ahsan, H
Graziano, JH
Hussain, I
Ahmed, KM
机构
[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
[2] CUNY Queens Coll, Flushing, NY 11367 USA
[3] Idaho Natl Environm & Engn Lab, Idaho Falls, ID USA
[4] CUNY Bernard M Baruch Coll, New York, NY 10010 USA
[5] Columbia Univ, Dept Stat, New York, NY 10027 USA
[6] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY 10032 USA
[7] Columbia Univ, Mailman Sch Publ Hlth, Dept Environm Hlth Sci, New York, NY 10032 USA
[8] Natl Inst Prevent & Social Med, Dhaka 1212, Bangladesh
[9] Univ Dhaka, Dept Geol, Dhaka 1000, Bangladesh
关键词
arsenic; groundwater; Bangladesh; tube well;
D O I
10.1029/2002WR001617
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Arsenic concentrations measured by graphite furnace atomic absorption range from <5 to 900 mu g/L in groundwater pumped from 6000 wells within a 25 km(2) area of Bangladesh. The proportion of wells that exceed the Bangladesh standard for drinking water of 50 mu g/L arsenic increases with depth from 25% between 8 and 10 m to 75% between 15 and 30 m, then declines gradually to less than 10% at 90 m. Some villages within the study area do not have a single well that meets the standard, while others have wells that are nearly all acceptable. In contrast to the distribution of arsenic in the 8-30 m depth range which does not follow any obvious geological feature, the arsenic content of groundwater associated with relatively oxic Pleistocene sand deposits appears to be consistently low. The depth of drilling necessary to reach these low-As aquifers ranges from 30 to 120 m depth within the study area.
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页数:16
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