对六种商用家用黄铜厨房水龙头进行了为期12个月的研究 测定了不同温度下铅和硒的总浸出量和颗粒浸出量 停滞不前的时间以及波特兰机场的持续长期模拟住宅使用 水务局水质实验室。水龙头被选为代表 铅含量不一，其中一个水龙头是用一种黄铜制成的 铅含量低于0.25%的合金。 一项对不同停滞时间的测试发现，黄铜水龙头 在长达6小时的停滞时间内，水龙头在1-L样品中没有检测到铅， 而其他水龙头样品中的最大铅浓度被发现为 为2微克/升，大大低于15微克/升的作用水平。 随后，制定了四个60毫升样本和一个760毫升样本的顺序抽样计划 样品用于监测水龙头铅释放的长期变化。这个 将四个小样本的结果与另一个样本进行比较 对重复水龙头进行冶金分析，以确定具体的内部水龙头部件 释放铅。最后的760毫升样品用于获得1-1毫升的骨料 样品水龙头的最大初始铅释放量计算在1-2之间 在聚合的1-L样品中为µg/L，大多数水龙头的铅释放量介于 甚至更低的0.1和1µg/L。对于某些水龙头，检测到的铅非常低，但可检测到 在每一个60毫升的样本中，表明在大多数情况下铅含量较低 并不是所有的内部金属水龙头组件。其他水龙头，包括 首先，非常低的铅释放仅被隔离到一个或两个部分 含铅的水龙头。其余的水龙头部件没有铅，因此 对采样水中的铅没有任何影响。 研究结果还发现，相同的水龙头铅释放量的变化系数为 将近两个，而且Envirobrass水龙头的铅浸出率非常低，尽管可以检测到， 浓度。最后，持续使用水龙头发现铅含量缓慢下降 由于水龙头内部长期钝化而释放。 研究发现，Envirobrass水龙头中的硒释放量为0.6微克/升或更低 所有样品，显著低于50微克/升MCL。仅包含摘要。

A 12-month study of six commercially available residential brass kitchen faucets was conducted to determine total and particulate lead and selenium leaching at various stagnation times as well as continuous long-term simulated residential use at the Portland Water Bureau's Water Quality Laboratory. The faucets were selected to represent varying lead content and included one faucet manufactured with Envirobrass, a brass alloy with a lead content of less than 0.25%. A test of varying stagnation times found that the Envirobrass faucet and one other faucet had no detectable lead in 1-L samples for stagnation times as long as six hours, while the maximum lead concentration in the samples of the other faucets were found to be 2 µg/L, substantially lower than the 15 µg/L action level. Afterwards, a sequential sampling plan of four 60-mL samples and one 760-mL sample was used to monitor the long-term changes in lead release from the faucets. The results of the four small initial samples were compared with a separate destructive metallurgical analysis of duplicate faucets to identify specific internal faucet components that were releasing lead. The final 760-mL sample was used to obtain an aggregate 1-L sample. The maximum initial lead release from the faucets was calculated between 1 - 2 µg/L in the aggregated 1-L sample, with most faucets having lead release between an even lower 0.1 and 1 µg/L. For some faucets, very low, but detectable, lead was detected in each of the 60-mL samples, indicating that low amounts of lead was present in most, if not all, of the interior metal faucet components. For other faucets, including the Envirobrass one, the very low lead release was isolated to only one or two parts of the faucet that contained lead. The remaining faucet components had no lead and therefore did not contribute to any lead in the sampled water. The results also found that identical faucet lead release varied by a factor of nearly two and that the Envirobrass faucet leached lead at very low, though detectable, concentrations. Finally, continuous use of the faucets found slowly decreasing lead release due to the long-term passivation of the faucet interiors. Selenium release from the Envirobrass faucet was found to be 0.6 µg/L or less in all samples, significantly less than the 50 µg/L MCL. Includes abstract only.