Effect of pH on rejection of different species of arsenic by nanofiltration
Effect of pH on rejection of different species of arsenic by nanofiltration
复制标题
pH值对纳滤截留不同种类砷的影响
DOI：
10.1016/s0011-9164(98)00062-9
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发表时间：
1998
期刊：
影响因子：
9.9
通讯作者：
Kazuo Yamamoto
中科院分区：
文献类型：
--
作者：
T. Urase;Jeong;Kazuo Yamamoto
饮用水中的砷引起了人们的关注，因为一些饮用水资源含有相当浓度的砷，对健康造成不利影响。研究了荷负电纳滤膜在饮用水除砷中的应用。实验进行了地下水，其中砷酸盐，亚砷酸盐和二甲基胂酸（DMMA）。采用离子色谱-电感耦合等离子体质谱（IC/ICP/MS）联用技术，实现了砷化合物的高灵敏度形态分析和定量分析。砷的截留率基本稳定，而砷的截留率随pH值的增加而增加。与氯离子的截留率相比，除DMMA外的砷化合物的截留率普遍较低。用扩展的能斯特-普朗克方程解释了截留率随pH变化的原因，其中考虑了砷化合物的化学平衡。
Arsenic in drinking water attracts attention because some of the drinking water resources contain considerable concentration of arsenic to cause adverse health effects. The application of nanofiltration (NF) to drinking water treatment for arsenic removal was examined with negatively charged NF membranes. Experiments were conducted with ground water to which arsenate, arsenite and dimethyl arsinic acid (DMMA) were added. The concentrations of three different species were measured by the ion chromatography-inductively coupled plasma-mass spectrometry (IC/ICP/MS) method by which speciation and quantification of arsenic compounds with high sensitivity is possible at the same time. Arsenate rejection was almost steady, while rejection of arsenite increased with pH. Compared to the rejection of chloride ion, arsenic compounds except DMMA generally gave lower rejection. The reason for rejection change with pH was explained by the extended Nernst Planck equation in which chemical equilibrium of arsenic compounds was taken into account.