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首页> 外文期刊>Water, Air, and Soil Pollution >GEOCHEMICAL BEHAVIOR OF ARSENIC IN KELLY LAKE, ONTARIO
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GEOCHEMICAL BEHAVIOR OF ARSENIC IN KELLY LAKE, ONTARIO

机译：安大略省凯利湖中砷的地球化学行为

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摘要

The objective of this study was to investigate the geochemical behavior of As in Kelly Lake, Ontario. A total of 65 water samples were collected from August 1998 to October 1999. Concentrations of As (total, dissolved and particulate) were determined in each water sample. Ther-modynamic models suggest that As interactions with Fe hydroxides could limit As concentrations in Kelly Lake water samples (by adsorption and forming arsenate minerals). It was concluded thatFe(II) arsenates (and not Fe(III) arsenate) formation/dissolution could control As concentrations in Kelly Lake. The activity of As (in terms of HAsO_4~(2-)) in the water samples was calculated from the monitoring data. The calculated activities were superimposed on the thermodynamic model of As minerals. All the calculated activity observations clustered around the Fe_3(AsO_4)_2.8H_2O(c)/Fe_4Fe_2(OH)_(12) SO_4(c). These observation suggest that the solubility of As in Kelly Lake is controlled by the equilibrium of Fe_3(AsO_4)_2.8H_2O(c)/Fe_4Fe_2(OH)_(12).SO_4(c), as suggested by thermodynamic solubility isotherms. The As concentration data were limited and spatial trend could not be verified in Kelly Lake water samples, although a decreasing trend in As concentrations at all depths was noticed from June to October 1999.
机译：这项研究的目的是调查安大略省凯利湖中砷的地球化学行为。从1998年8月到1999年10月，总共收集了65个水样品。在每个水样品中测定了As的浓度（总，溶解和颗粒）。热力学模型表明，As与Fe氢氧化物的相互作用可能会限制Kelly Lake水样品中的As浓度（通过吸附并形成砷酸盐矿物）。得出的结论是，在凯利湖中，砷化铁（而不是砷化铁（III））的形成/溶解可以控制砷的浓度。根据监测数据计算出水样中As的活度（以HAsO_4〜（2-）表示）。计算出的活度叠加在砷矿物的热力学模型上。所有计算得出的活动观测值都聚集在Fe_3（AsO_4）_2.8H_2O（c）/ Fe_4Fe_2（OH）_（12）SO_4（c）周围。这些观察结果表明，As在凯利湖中的溶解度受Fe_3（AsO_4）_2.8H_2O（c）/ Fe_4Fe_2（OH）_（12）.SO_4（c）的平衡控制，如热力学溶解度等温线所示。尽管在1999年6月至10月期间发现所有深度的砷浓度都有下降的趋势，但凯利湖水样中的砷浓度数据是有限的，而且无法证实其空间趋势。

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