首页> 外文会议>American Chemical Society Symposium on Advances in Arsenic Research >Calculation of the Interaction of Bicarbonate Ion with Arsenites in Aqueous Solution and with the Surfaces of Al Hydroxide Minerals
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Calculation of the Interaction of Bicarbonate Ion with Arsenites in Aqueous Solution and with the Surfaces of Al Hydroxide Minerals

机译:碳酸氢盐与水溶液中的碳酸氢盐离子与Al氢氧化物矿物表面的计算

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Quantum mechanical calculations are used to study the stabilities of arsenite - bicarbonate and carbonate complexes and the stability of bicarbonate adsorbed onto models for Al hydroxide mineral surfaces. We identify a complex As(OH)_2CO_3~-, with a As-O-C linkage, which has a similar stability to the condensation dimer of As(OH)_3. This complex may significantly contribute to the total concentration of As in solution. The hydrated ion-pair form of this complex, As(OH)_2CO_3Na(OH_2)_2, is calculated to have a vibrational spectroscopic signature which may help in its identification. By contrast, the interaction of bicarbonate with the Al hydroxide mineral surface is much weaker than that of arsenite or arsenate, so that adsorbed arsenite and arsenate species will not be displaced by bicarbonate.
机译:量子力学计算用于研究砷酸盐 - 碳酸氢盐和碳酸盐复合物的稳定性以及吸附在Al氢氧化物矿物表面模型上的碳酸氢盐的稳定性。我们将复合物识别为(OH)_2CO_3〜 - ,具有AS-O-C连杆,其具有与(OH)_3的冷凝二聚体相似的稳定性。这种复合物可以显着促进溶液中的总浓度。将该复合物的水合离子对形式的作为(OH)_2CO_3NA(OH_2)_2表示以具有振动光谱签名,其可以有助于其识别。相比之下,碳酸氢盐与Al氢氧化物矿物表面的相互作用比砷酸盐或砷酸酯的相互作用远低得多,因此吸附的砷酸盐和砷酸酯物种不会通过碳酸氢盐移位。

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