本报告讨论了为研究pH值等于或大于9.0、有机碳酸盐（TIC）总浓度为每升10至80 mg碳酸钙（CaCO3/L）对铅溶解度的影响而进行的实验。将结果与pH值为8.0至8.5的早期实验进行了比较。在pH值等于或大于9.0的实验中，铅浸出率降低，剩余游离氯和溶解氧的消耗也降低。结果与溶解度模型的预测非常接近，该模型允许在实验pH和TIC条件下，水溶液中的铅络合和固体碱式碳酸铅的控制。作者警告说，在选择通过增加pH值来减少铅溶解的处理方案之前，必须考虑这种作用对其他水质特征的影响，尤其是三卤甲烷的形成。 包括26个参考文献、表格和图表。

This report discusses experiments which were conducted to study the effect of a pH equal to or greater than 9.0 and a low total in organic carbonate (TIC) concentration of 10 to 80 mg as calcium carbonate per liter (CaCO3/L) on lead solubility. The results were compared with those of earlier experiments in which the pH was 8.0 to 8.5. In the experiments that had pHs equal to or greater than 9.0, lead leaching was reduced, as was consumption of both residual free chlorine and dissolved oxygen. The results closely followed the predictions of a solubility model that allowed for aqueous lead complexation and control by the solid basic lead carbonate under the experimental pH and TIC conditions. The authors caution that before a treatment program to reduce lead dissolution by increasing pH is selected, the impact of this action on other water quality characteristics, particularly the formation of trihalomethanes, must be considered. Includes 26 references, tables, figures.