Effect of pH on the concentrations of lead and trace contaminants in drinking water: A combined batch, pipe loop and sentinel home study
Effect of pH on the concentrations of lead and trace contaminants in drinking water: A combined batch, pipe loop and sentinel home study
复制标题
DOI：
10.1016/j.watres.2011.02.023
复制
发表时间：
2011-04-01
期刊：
影响因子：
12.8
通讯作者：
Koshowski, Scott
中科院分区：
文献类型：
--
作者：
Kim, Eun Jung;Herrera, Jose E.;Koshowski, Scott
在北美和欧洲许多地区，由铅管供水的家庭仍然担心饮用水中铅含量过高的问题。本文重点研究pH值对通过铅管输送的饮用水中铅浓度的影响。尽管过去已经对此进行过研究，但我们开展了一项结合批次实验、管回路实验和定点研究的项目，旨在填补文献中存在的一些空白。本研究使用了从伦敦市供水系统中挖掘出的铅管以及水质数据。正如预期的那样，随着pH值的升高，腐蚀垢的铅溶解度通常会降低；而腐蚀垢中其他累积金属的溶解则呈现出多种趋势。此外，溶解的砷和铝浓度显示出很强的相关性，这表明腐蚀垢中存在的铝硅酸盐相会积累砷。水中总铅浓度的很大一部分可追溯到颗粒态铅。我们的研究结果表明，在流动系统中，颗粒态铅是总铅浓度的主要贡献者，而在停滞系统中，颗粒态铅对总铅浓度的贡献只有在水的pH值较高时才会显著。（C）2011。爱思唯尔有限公司。保留所有权利。
High lead levels in drinking water are still a concern for households serviced by lead pipes in many parts of North America and Europe. This contribution focuses on the effect of pH on lead concentrations in drinking water delivered through lead pipes. Though this has been addressed in the past, we have conducted a combined batch, pipe loop and sentinel study aiming at filling some of the gaps present in the literature. Exhumed lead pipes and water quality data from the City of London's water distribution system were used in this study. As expected, the lead solubility of corrosion scale generally decreased as pH increased; whereas dissolution of other accumulated metals present in the corrosion scale followed a variety of trends. Moreover, dissolved arsenic and aluminum concentrations showed a strong correlation, indicating that the aluminosilicate phase present in the scale accumulates arsenic. A significant fraction of the total lead concentration in water was traced to particulate lead. Our results indicate that particulate lead is the primary contributor to total lead concentration in flowing systems, whereas particulate lead contribution to total lead concentrations for stagnated systems becomes significant only at high water pH values. (C) 2011. Elsevier Ltd. All rights reserved.