未充分考虑颗粒铅 在铅认证程序中。2007年， NSF-53测试协议的修改 对于铅还原，包括添加 NSF挑战水中的颗粒铅含量， 导致取消了 通过使用点设备倾倒。结果 这项研究的结果表明，水龙头安装和 水槽下的家用过滤设备 能有效去除总铅含量（两种 NSF下的溶解物和颗粒物 参考水平为10微克/升。但是，倒入 家用过滤设备性能差 去除了颗粒铅，因此， 污水中的铅含量仍然很高。 这种效率的缺乏归因于 用于倾注装置的过滤器和 有理由取消NSF-53认证 用于减少此类设备中的铅含量 这项研究的结果也表明 选择合适人选的重要性 减少铅含量的装置，因为 铅可以偶尔从铅中释放出来 服务管线、房屋管道和水龙头。包括30个参考文献、表格和图表。

Particulate lead is inadequately considered in lead certification procedures. In 2007, modification of the NSF-53 testing protocol for lead reduction, consisting of the addition of particulate lead in the NSF challenge water, resulted in cancellation of the certification of pour-through point-of-use devices. The results of this study showed that tap-mounted and under-the-sink domestic filtration devices were efficient in removing total lead (both dissolved and particulate) under the NSF reference level of 10 µg/L. However, pour-through domestic filtration devices poorly removed particulate lead, and, as a result, high lead levels remained in effluent water. This lack of efficiency is attributed to the type of filter used in pour-through devices and justifies cancellation of the NSF-53 certification for lead reduction for such devices in 2007. The results of this research also show the importance of selecting appropriate devices for lead reduction, because particulate lead can be released sporadically from lead service lines, premise plumbing, and faucets.Includes 30 references, tables, figures.