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Can Arsenic Occurrence Rates in Bedrock Aquifers Be Predicted?

机译：是否可以预测基岩含水层中的砷发生率？

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摘要

A high percentage (31%) of groundwater samples from bedrock aquifers in the greater Augusta area, Maine was found to contain greater than 10 μg L~(-1) of arsenic. Elevated arsenic concentrations are associated with bedrock geology, and more frequently observed in samples with high pH, low dissolved oxygen, and low nitrate. These associations were quantitatively compared by statistical analysis. Stepwise logistic regression models using bedrock geology and/or water chemistry parameters are developed and tested with external data sets to explore the feasibility of predicting groundwater arsenic occurrence rates (the percentages of arsenic concentrations higher than 10 μg L~(-1)) in bedrock aquifers. Despite the under-prediction of high arsenic occurrence rates, models including groundwater geochemistry parameters predict arsenic occurrence rates better than those with bedrock geology only. Such simple models with very few parameters can be applied to obtain a preliminary arsenic risk assessment in bedrock aquifers at local to intermediate scales at other localities with similar geology.
机译：在缅因州大奥古斯塔地区，从基岩含水层中抽取的地下水样品中有很高的比例（31％）被发现含有大于10μgL〜（-1）的砷。砷浓度升高与基岩地质有关，在具有高pH，低溶解氧和低硝酸盐的样品中更常见。通过统计分析对这些关联进行定量比较。建立了利用基岩地质学和/或水化学参数的逐步逻辑回归模型，并通过外部数据集进行了测试，以探索预测基岩中地下水砷发生率（砷浓度百分比高于10μgL〜（-1））的可行性。含水层。尽管高砷发生率的预测不足，但包括地下水地球化学参数在内的模型预测的砷发生率要好于仅具有基岩地质特征的模型。具有很少参数的这种简单模型可以用于在地质相似的其他地方的局部到中等规模的基岩含水层中获得初步砷风险评估。

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  • 来源
    《Environmental Science & Technology》 |2012年第4期|p.2080-2087|共8页
  • 作者

    Qiang Yang; Hun Bok Jung; Robert G. Marvinney; Charles W. Culbertson; Yan Zheng;

  • 作者单位

    Queens College and Graduate Center, City University of New York, 6530 Kissena Blvd., Flushing, New York 11367, United States,Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, New York 10964, United States;

    Queens College and Graduate Center, City University of New York, 6530 Kissena Blvd., Flushing, New York 11367, United States;

    Maine Geological Survey, 22 State House Station, Augusta, Maine 04333, United States;

    U.S. Geological Survey Maine Water Science Center, 196 Whitten Road, Augusta, Maine 04330, United States;

    Queens College and Graduate Center, City University of New York, 6530 Kissena Blvd., Flushing, New York 11367, United States,Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, New York 10964, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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