Well characteristics influencing arsenic concentrations in ground water
Well characteristics influencing arsenic concentrations in ground water
复制标题
DOI：
10.1016/j.watres.2005.07.026
复制
发表时间：
2005-10-01
期刊：
影响因子：
12.8
通讯作者：
Barnes, RJ
中科院分区：
文献类型：
--
作者：
Erickson, ML;Barnes, RJ
中西部北部地下水中自然发生的砷污染很常见。砷最有可能存在于位于威斯康星州晚期冰川漂流西北物源范围内的冰川漂流和浅基岩井中。砷升高在生活井和监测井中比在公共供水系统井中更常见。砷污染在靠近上部限制单元（例如冰川耕作单元）设置短筛管的家用井中也更为普遍。与家用井和监测井相比，公共供水系统井的建井实践和井特征明显不同。开发厚而粗的含水层和安装长井筛等施工实践为公共供水系统井提供了良好的水量。巧合的是，这些施工实践也常常产生低砷水。粗含水层材料用于吸附砷的表面积较小，因此可用于潜在流动的砷较少。距上部限制单元一定距离的长筛管暴露于有利于砷通过还原机制（例如金属氢氧化物的还原溶解和砷的还原解吸）迁移的地球化学条件的风险较低。 (c) 2005 Elsevier Ltd. 保留所有权利。
Naturally occurring arsenic contamination is common in ground water in the upper Midwest. Arsenic is most likely to be present in glacial drift and shallow bedrock wells that lie within the footprint of northwest provenance Late Wisconsinan glacial drift. Elevated arsenic is more common in domestic wells and in monitoring wells than it is in public water system wells. Arsenic contamination is also more prevalent in domestic wells with short screens set in proximity to an upper confining unit, such as glacial till.Public water system wells have distinctly different well-construction practices and well characteristics when compared to domestic and monitoring wells. Construction practices such as exploiting a thick, coarse aquifer and installing a long well screen yield good water quantity for public water system wells. Coincidentally, these construction practices also often yield low arsenic water. Coarse aquifer materials have less surface area for adsorbing arsenic, and thus less arsenic available for potential mobilization. Wells with long screens set at a distance from an upper confining unit are at lower risk of exposure to geochemical conditions conducive to arsenic mobilization via reductive mechanisms such as reductive dissolution of metal hydroxides and reductive desorption of arsenic. (c) 2005 Elsevier Ltd. All rights reserved.