Aquifer arsenic source
Aquifer arsenic source
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DOI：
10.1038/ngeo1277
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发表时间：
2011-10
影响因子：
18.3
通讯作者：
J. McArthur;P. Ravenscroft;O. Sracek
中科院分区：
文献类型：
--
作者：
J. McArthur;P. Ravenscroft;O. Sracek
图1|a，来自Neumann等人的含水层剖面。砷和δ18O的含量(论文中的图1a和1g)。黄色区域表示Bashailbhog含水层中的富砷水。深蓝色区域是Neumann等人确定的水域。有δ18O<；−4.75‰，因此，在他们的解释中，是来自池塘。在我们的解释中，两种深浅不同蓝色的区域都表示水在向含水层注入砷。插图显示了Neumann等人的模型输出。用深度预测开发前水的比例(图1E)，上面覆盖着黄色的砷分布。B，Bahailbhog西北800米的Bejgaon的Munshiganj含水层中DOC、溶解钙、氯化物和砷的交叉图(数据来自参考文献7；类似的数据不适用于Bashailbhog(Bashailbhog)，深度为30 Mbgl--水的渗透深度是同位素很轻的--因此，根据Neumann等人的说法，它来自池塘。我们没有从冲刷带下面划出更深的水域，因为它们的来源和年代不同。线性趋势显示矿化地下水约30 Mbgl与矿化程度较低的浅层补给之间的混合。C，Bejgaon含水层中砷和δ18O的含水层剖面；参考文献中的砷数据。7；参考文献中δ18O的数据8，包括样本30(2)、30(3)和61(2)。
Figure 1| a, Aquifer profiles from Neumann et al. of arsenic and δ18O (Figs 1a and 1g in their paper). Yellow areas denote arsenic-rich water in the aquifer at Bashailbhog. Dark blue area is water identified by Neumann et al. as having δ18O<− 4.75‰ and so is, in their interpretation, derived from ponds. In our interpretation, areas of both shades of blue indicate water that is fiushing the aquifer of arsenic. Inset shows model outputs of Neumann et al. predicting the proportion of predevelopment water with depth (their Fig. 1e), overlain by the distribution of arsenic in yellow. b, Cross-plots of DOC, dissolved calcium, chloride and arsenic in the Munshiganj aquifer at Bejgaon, 800 m northwest of Bashailbhog (data from ref. 7; similar data are not available for Bashailbhog) for depths to 30 mbgl—the depth of penetration of water that is isotopically light—and so, according to Neumann et al., derives from ponds. We do not plot deeper waters from beneath the zone of fiushing as they are of different derivation and age. The linear trends show mixing between a mineralized groundwater around 30 mbgl and less-mineralized shallower recharge. c, Aquifer profiles of arsenic and δ18O in the aquifer at Bejgaon; data for arsenic from ref. 7; data for δ18O from ref. 8, includes samples 30 (2), 30 (3) and 61 (2).