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Influence of Water Chemistry on the Dissolution Rates of Lead Corrosion Products 水化学对铅腐蚀产物溶解速率的影响
发布日期: 2009-11-01
铅腐蚀产物的溶解,以氧化皮的形式出现在 配电系统可能是饮用水的铅源。腐蚀产物 管内氧化皮包括铅(II)氧化物、碳酸盐和磷酸盐以及铅(IV)氧化物 当存在高浓度的游离氯时。治疗过程的变化 影响分配系统水化学有可能增强或抑制 铅的溶解- 含有腐蚀产物。三种含铅溶液的溶出速率 在分配系统中观察到的固体被系统地测量为 重要水化学参数的函数。研究了铅腐蚀产物 碳酸氢芥酸铅(II)、磷酸羟基辉绿岩铅(II)和铅(IV) 氧化铂白云石。溶解速率随pH、溶解无机碳、, 正磷酸盐浓度,以及是否存在一氯胺。 解散 所有三种腐蚀产物的速率都受到pH值的强烈影响。磷酸盐的存在 显著降低了所有三相的溶解速率;对于氢芥石,添加 磷酸盐导致碳酸铅固体逐渐转变为铅(II) 磷酸盐固体。溶解无机碳的影响更为复杂。包括5个参考文献,图。
The dissolution of lead corrosion products that are present as scales on lead pipes in distribution systems can be a source of lead to drinking water. Corrosion products that develop in pipe scales include lead(II) oxides, carbonates, and phosphates as well as lead(IV) oxides when high concentrations of free chlorine are present. Changes in treatment processes that influence the distribution system water chemistry have the potential to enhance or inhibit the dissolution of lead-containing corrosion products. The dissolution rates of three lead-containing solids that have been observed in distribution systems have been systematically measured as a function of important water chemistry parameters. The lead corrosion products studied are lead(II) carbonate hydrocerussite, lead(II) phosphate hydroxylpyromorphite, and lead(IV) oxide plattnerite. Dissolution rates were varied as a function of pH, dissolved inorganic carbon, orthophosphate concentration, and the presence or absence of monochloramine. The dissolution rates of all three corrosion products were strongly influenced by pH. The presence of phosphate dramatically decreased the dissolution rate of all three phases; for hydrocerussite, the addition of phosphate induced the gradual transformation of a lead(II) carbonate solid into a lead(II) phosphate solid. The influence of dissolved inorganic carbon was more complex. Includes 5 references, figure.
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发布单位或类别: 美国-美国给水工程协会
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