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Control of Drinking-Water Lead-Contamination Contributed by Brass Plumbing Fixtures 黄铜管道装置对饮用水铅污染的控制
发布日期: 1993-01-01
本研究的主要目的是调查黄铜腐蚀机理,并开发一种新的、有效的工艺,以控制饮用水中黄铜夹具造成的铅污染。为了控制饮用水铅污染,开发了一种铅选择性化学处理工艺。黄铜表面的金属铅被含有约0.01 M氯化铜和pH值为-2.0的溶液氧化。氧化的铅和一些锌溶解在处理溶液中,被更稳定的金属铜取代。 通过扫描电子显微镜和X射线发射光谱证实了富铜、贫铅表面的形成。与水接触的黄铜表面往往会经历一个称为脱锌的缓慢老化过程,最终形成富铜表面。本研究开发的过程是脱锌的加速版本。因此,富铜界面应稳定,并防止铅污染超过调查的92天暴露时间。
The main objectives of the present study were to investigate brass corrosion mechanisms, and to develop a new, effective process to control drinking water lead contamination contributed from brass fixtures. A lead-selective chemical treatment process was developed for the control of drinking water lead contamination contributed from brass fixtures. Metallic lead in the brass surface was oxidized with a solution containing approximately 0.01 M cupric chloride and pH - 2.0. The oxidized lead and also some zinc dissolved into the treatment solution and was replaced by more stable metallic copper. The formation of a copper-enriched, lead-depleted surface was confirmed by scanning electron microscopy coupled with X-ray emission spectroscopy. Brass surfaces in contact with water tend to undergo a slower aging process called dezincification which ultimately results in the formation of copper-enriched surfaces. The process developed in this study was an accelerated version of dezincification. Consequently, the copper-enriched interface should be stable and prevent lead contamination beyond the 92 days of exposure investigated.
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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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