Abstract：
Variations in water chemistry may lead to the release of harmful heavy metals in drinking water distribution systems (DWDSs). In this study, the effects of chloride on the release of heavy metals such as Fe, Mn, As, Cr, Mo, V, Sr, and Co were examined using steel and cast iron pipe loops. After chloride was added, the relative contents of goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and siderite (FeCO3) in pipe scales increased, but the contents of magnetite (Fe3O4) decreased. The most prevalent compounds were α-FeOOH and γ-FeOOH. When the chloride levels were increased, the effluent concentrations of Fe, Mn, As, Cr, Mo, V, Sr, and Co significantly increased. These heavy metals were released presumably because of the destabilization and dissolution of corrosion scales induced by chloride and adsorption site competition. Strong positive correlations were also observed between Fe&Mn, Fe/Mn&As, Fe/Mn&Cr, Fe/Mn&Mo, Fe/Mn&V, Fe/Mn&Sr, and Fe/Mn&Co, indicating the co-release of Fe, Mn, and other metals. This study may be helpful for the potential strategies on avoidance of heavy metal release and improvement of water supply security.
摘要：
水化学的变化可能导致饮用水分配系统（DWDS）中有害重金属的释放。在这项研究中,氯化物对Fe等重金属释放的影响，Mn,As,Cr,Mo,V,Sr,和Co使用钢和铸铁管环进行了检查。加入氯化物后，针铁矿(α-FeOOH)的相对含量，鳞闪石（γ-FeOOH），和菱铁矿（FeCO3）在管道规模增加，但磁铁矿(Fe3O4)含量下降。最普遍的化合物是α-FeOOH和γ-FeOOH。当氯化物含量增加时，废水中Fe的浓度，Mn,As,Cr,Mo,V,Sr,公司大幅增加。这些重金属的释放可能是由于氯化物和吸附位点竞争引起的腐蚀垢的不稳定和溶解。Fe和Mn之间也观察到了很强的正相关关系，Fe/Mn&As,Fe/Mn&Cr,Fe/Mn&Mo,Fe/Mn&V,Fe/Mn&Sr,和Fe/Mn&Co，表明Fe的共同释放，Mn,和其他金属。这项研究可能有助于避免重金属释放和提高供水安全的潜在策略。
