Gaps in the United States Environmental Protection Agency (US EPA) Lead and Copper Rule (LCR) leave some consumers and their pets vulnerable to high cuprosolvency in drinking water. This study seeks to help proactive utilities who wish to mitigate cuprosolvency problems through the addition of orthophosphate corrosion inhibitors. The minimum doses of orthophosphate necessary to achieve acceptable cuprosolvency in relatively new copper pipe were estimated as a function of alkalinity via linear regressions for the 90th, 95th, and 100th percentile copper tube segments (R² > 0.98, n = 4). Orthophosphate was very effective at reducing cuprosolvency in the short term but, in some cases, resulted in higher long-term copper concentrations than the corresponding condition without orthophosphate. Alternatives to predicting “long-term” results for copper tubes using simpler bench tests starting with fresh Cu(OH)₂ solids showed promise but would require further vetting to overcome limitations such as maintaining water chemistry and orthophosphate residuals and to ensure comparability to results using copper tube.

中文翻译：

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考虑基于“最低正磷酸盐”标准的以实用为中心的框架，以缓解饮用水中铜溶解度升高的问题

美国环境保护署 (US EPA) 铅铜规则 (LCR) 的缺陷导致一些消费者及其宠物容易受到饮用水中高铜溶解度的影响。这项研究旨在帮助那些希望通过添加正磷酸盐腐蚀抑制剂来缓解铜溶解问题的积极主动的公用事业公司。通过对第 90、95 和 100 个百分位数的铜管段进行线性回归，将相对较新的铜管实现可接受的铜溶解能力所需的正磷酸盐最小剂量估计为碱度的函数（R ² > 0.98，n = 4）。正磷酸盐在短期内非常有效地降低铜溶解能力，但在某些情况下，与不含正磷酸盐的相应条件相比，会导致长期铜浓度更高。使用从新鲜 Cu(OH) ₂固体开始的更简单的台架测试来预测铜管“长期”结果的替代方案显示出希望，但需要进一步审查以克服限制，例如保持水化学和正磷酸盐残留，并确保与使用结果的可比性铜管。