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Causes and distribution of arsenic contamination in Bangladesh: evidence from the literature

机译：孟加拉国砷污染的原因和分布：文献证据

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In attempting to eliminate disease caused by drinking polluted surface water, millions of tube-wells were drillednin Bangladesh. However, owing to arsenic in groundwater, the availability of safe drinking water has declinednfrom earlier achievement of 97% to 51.2%. This article reviews the causes and distribution of arsenicnconcentration in rural Bangladesh from a wide variety of literature. Scientists have converged to two hypothesesnfor causes of arsenic in groundwater: the pyrite oxidation hypothesis and the oxy-hydroxide reduction hypothesis.nThere is a positive correlation between arsenic content in irrigated groundwater and arsenic contained in soils.nThere is a significant presence of arsenic in rice and leafy vegetables. Today, arsenic is causing toxicity to humannhealth and creating major social problems. This finding implies that, had there been a precautionary measure takennwhen a new technology tube-well was being introduced, in the form of testing water for harmful metals, the risknthat the rural population is facing now could have been drastically reduced. This lack of precautionary measure,nbefore starting a mass installation of tube-wells for drinking and irrigation should be seen as a “human error” andnavoided in future water policy and planning.
机译：为了消除因饮用被污染的地表水引起的疾病，孟加拉国钻了数百万个管井。然而，由于地下水中的砷，安全饮用水的供应量已从先前的97％下降到51.2％。本文从各种各样的文献中回顾了孟加拉国农村地区砷致富集的原因和分布。科学家已经将两个假设归结为地下水中砷的原因：黄铁矿氧化假说和羟基氧化还原假说。n灌溉地下水中的砷含量与土壤中的砷之间存在正相关。n水稻中存在大量的砷。和绿叶蔬菜。如今，砷正在对人类健康造成毒性并造成重大的社会问题。该发现表明，如果在引入新技术的管井时采取了预防措施，以测试水中是否含有有害金属的形式，则可以大大降低农村人口现在面临的风险。在开始大规模安装用于饮用和灌溉的管井之前，缺乏预防措施应被视为“人为错误”，并且在未来的水政策和规划中应避免。

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