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Effects of Phosphate, Silicate, and Bicarbonate on Arsenopyrite Dissolution and Secondary Mineral Precipitation
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-02-06 , DOI: 10.1021/acsearthspacechem.9b00273 Xuanhao Wu 1 , Samantha Burnell 1, 2 , Chelsea W. Neil 1 , Doyoon Kim 1 , Lijie Zhang 1 , Haesung Jung 1 , Young-Shin Jun 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-02-06 , DOI: 10.1021/acsearthspacechem.9b00273 Xuanhao Wu 1 , Samantha Burnell 1, 2 , Chelsea W. Neil 1 , Doyoon Kim 1 , Lijie Zhang 1 , Haesung Jung 1 , Young-Shin Jun 1
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Managed aquifer recharge (MAR) has been applied to meet quickly growing water demands. However, during MAR operations, the injected water can induce dissolution of local minerals and result in the release of toxic metalloids, such as arsenic. To alleviate this concern, it is pivotal to understand the effects of injected water chemistry on arsenic mobilization during MAR. In this bench-scale study with geochemical conditions relevant to MAR operations, we investigated the impacts of three environmentally abundant oxyanions (i.e., phosphate, silicate, and bicarbonate) on arsenic mobilization from arsenopyrite (FeAsS) and secondary mineral precipitation. Phosphate showed time-dependent reversed effects on arsenic mobility. In short term (6 h), phosphate promoted the dissolution of FeAsS through monodentate mononuclear surface complexation. However, over a longer experimental time (7 days), the enhanced formation of secondary minerals, such as iron(III) (hydr)oxide (maghemite, γ-Fe2O3) and iron(III) phosphate (phosphosiderite, FePO4·2H2O), helped to decrease arsenic mobility through readsorption. Silicate increased arsenic mobility and bicarbonate decreased arsenic mobility during the entire 7 day reaction. The phosphate system showed the highest amount and largest sizes of secondary precipitates among the three oxyanions. These new observations provide a useful mechanistic understanding of the impacts of different oxyanions on arsenic mobilization and secondary mineral formation during the geochemical transformation of arsenic-containing sulfide minerals in MAR and also offer useful insight into water chemistry factors during pretreatment for MAR source water.
中文翻译：
磷酸盐，硅酸盐和碳酸氢盐对毒砂溶解和二次矿物沉淀的影响
有管理的含水层补给（MAR）已被用来满足快速增长的水需求。但是，在MAR作业期间，注入的水会诱导局部矿物质溶解，并导致有毒准金属如砷的释放。为了减轻这种担忧，了解注水化学过程对MAR期间砷动员的影响至关重要。在这项与MAR作业有关的地球化学条件的台式研究中，我们研究了三种环境上丰富的含氧阴离子（即磷酸根，硅酸根和碳酸氢根）对从砷黄铁矿（FeAsS）运移砷和二次矿物沉淀的影响。磷酸盐显示出对砷迁移率的时间依赖性逆转效应。在短期内（6小时），磷酸盐通过单齿单核表面络合促进了FeAsS的溶解。然而，2 O 3）和磷酸铁（III）（亚磷酸铁盐，FePO 4 ·2H 2 O）有助于通过再吸收降低砷的迁移率。在整个7天的反应中，硅酸盐增加了砷的迁移率，碳酸氢盐降低了砷的迁移率。磷酸盐体系在三种含氧阴离子中显示出最高的量和最大的二次沉淀物尺寸。这些新的观察结果为了解含氧阴离子对MAR中含砷的硫化物矿物进行地球化学转化过程中不同的含氧阴离子对砷迁移和次生矿物形成的影响提供了有用的机理，也为对MAR源水进行预处理期间的水化学因素提供了有用的见识。
更新日期：2020-02-06
中文翻译：
磷酸盐，硅酸盐和碳酸氢盐对毒砂溶解和二次矿物沉淀的影响
有管理的含水层补给（MAR）已被用来满足快速增长的水需求。但是，在MAR作业期间，注入的水会诱导局部矿物质溶解，并导致有毒准金属如砷的释放。为了减轻这种担忧，了解注水化学过程对MAR期间砷动员的影响至关重要。在这项与MAR作业有关的地球化学条件的台式研究中，我们研究了三种环境上丰富的含氧阴离子（即磷酸根，硅酸根和碳酸氢根）对从砷黄铁矿（FeAsS）运移砷和二次矿物沉淀的影响。磷酸盐显示出对砷迁移率的时间依赖性逆转效应。在短期内（6小时），磷酸盐通过单齿单核表面络合促进了FeAsS的溶解。然而，2 O 3）和磷酸铁（III）（亚磷酸铁盐，FePO 4 ·2H 2 O）有助于通过再吸收降低砷的迁移率。在整个7天的反应中，硅酸盐增加了砷的迁移率，碳酸氢盐降低了砷的迁移率。磷酸盐体系在三种含氧阴离子中显示出最高的量和最大的二次沉淀物尺寸。这些新的观察结果为了解含氧阴离子对MAR中含砷的硫化物矿物进行地球化学转化过程中不同的含氧阴离子对砷迁移和次生矿物形成的影响提供了有用的机理，也为对MAR源水进行预处理期间的水化学因素提供了有用的见识。
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