Arsenic in groundwater in eastern New England: Occurrence, controls, and human health implications
Arsenic in groundwater in eastern New England: Occurrence, controls, and human health implications
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DOI：
10.1021/es026211g
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发表时间：
2003-05-15
影响因子：
11.4
通讯作者：
Robinson, KW
中科院分区：
文献类型：
--
作者：
Ayotte, JD;Montgomery, DL;Robinson, KW
在新英格兰东部，地下水中砷的浓度很高（大于10马克/升）。来自基岩含水层的私人供应饮用水的砷浓度往往达到令人关切的人类健康水平，而来自松散含水层的饮用水受砷污染的影响最小。主要在缅因州和新罕布什尔州的超沉积基岩单元的水井中，砷浓度最高——这些含水层中近30%的水井产出的水砷浓度超过10杯/升。在这些地层的整个岩石样本中也发现了浓度为3-40毫克/公斤的砷，这表明可能存在地质来源。砷在高pH的地下水中最常见。高pH与地下水年龄有关，也可能与基岩中方解石的存在有关。以前被海水淹没的地区的离子交换也可能增加ph值。在1-10个月内取样两次的井具有相似的砷浓度（斜率= 0.89；r平方= 0.97）。根据所研究的含水层用水信息，约有10.3万拥有私人水井的人所饮用的水的砷含量可能达到人体健康关注的水平（大于10马克/升）。
In eastern New England, high concentrations (greater than 10 mug/L) of arsenic occur in groundwater. Privately supplied drinking water from bedrock aquifers often has arsenic concentrations at levels of concern to human health, whereas drinking water from unconsolidated aquifers is least affected by arsenic contamination. Water from wells in metasedimentary bedrock units, primarily in Maine and New Hampshire, has the highest arsenic concentrations-nearly 30% of wells in these aquifers produce water with arsenic concentrations greater than 10 mug/L. Arsenic was also found at concentrations of 3-40 mg/kg in whole rock samples in these formations, suggesting a possible geologic source. Arsenic is most common in groundwater with high pH. High pH is related to groundwater age and possibly the presence of calcite in bedrock. Ion exchange in areas formerly inundated by seawater also may increase pH. Wells sampled twice during periods of 1-10 months have similar arsenic concentrations (slope = 0.89; r-squared = 0.97). On the basis of wateruse information for the aquifers studied, about 103 000 people with private wells could have water supplies with arsenic at levels of concern (greater than 10 mug/L) for human health.