水環境学会誌
Online ISSN : 1881-3690
Print ISSN : 0916-8958
ISSN-L : 0916-8958
原著論文
バングラデシュにおける地下水のヒ素汚染について
サムタ村におけるヒ素濃度特性と溶出メカニズムに関する一考察
田辺 公子矢野 靖典廣木 峰也濱部 和宏薮内 一宏横田 漠廣中 博見徳永 裕司ハミドール ラーマンフェローゼ アーメッド
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ジャーナル フリー

2001 年 24 巻 6 号 p. 367-375

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We have surveyed water quality in Samta village in Bangladesh since March 1997, and analyzed the arsenic concentrations of groundwater in the area surrounding Samta. This paper shows the results of the survey, concerning the characteristics of arsenic contamination of groundwater and the nechanism of arsemic elution.
1) The arsenic concentration of groundwater in Samta showed the tendency to increase with the passage of time.
2) The arsenic contamination is observed widely in the area surrounding Samta, although not so high as in Samta.
3) It is characteristic that concentration of HCO3- and Fe2+ in groundwater are high and their distribution is in accordance with that of arsenic contamination.
4) The pentavalent arsenic concentration in groundwater was higher than that of trivalent in the north of Samta, but in the south trivalent arsenic concentration was higher than that of pentavalent.
5) The distribution of HCO3-, Fe2+ and EC in groundwater explains that the mechanism of arsenic elution to groundwater is mainly caused via the reduced state of groundwater and partially via oxidation state.
6) There is some correlation between thickness of upper muddy layer and distribution of arsenic concentration of groundwater in Samta.

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© 2001 公益社団法人 日本水環境学会
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