Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA.
Naval Research Laboratory, Stennis Space Center, MS 39529, USA.
Sci Total Environ. 2016 Jan 15;541:184-193. doi: 10.1016/j.scitotenv.2015.09.054. Epub 2015 Sep 24.
This study provides a physicochemical assessment of manganese deposits on brass and lead components from two fully operational drinking water distributions systems. One of the systems was maintained with chlorine; the other, with secondary chloramine disinfection. Synchrotron-based in-situ micro X-ray adsorption near edge structure was used to assess the mineralogy. In-situ micro X-ray fluorescence mapping was used to demonstrate the spatial relationships between manganese and potentially toxic adsorbed metal ions. The Mn deposits ranged in thickness from 0.01 to 400 μm. They were composed primarily of Mn oxides/oxhydroxides, birnessite (Mn(3+) and Mn(4+)) and hollandite (Mn(2+) and Mn(4+)), and a Mn silicate, braunite (Mn(2+) and Mn(4+)), in varying proportions. Iron, chromium, and strontium, in addition to the alloying elements lead and copper, were co-located within manganese deposits. With the exception of iron, all are related to specific health issues and are of concern to the U.S. Environmental Protection Agency (U.S. EPA). The specific properties of Mn deposits, i.e., adsorption of metals ions, oxidation of metal ions and resuspension are discussed with respect to their influence on drinking water quality.
本研究对两个全运营饮用水分配系统中黄铜和铅部件上的锰沉积物进行了物理化学评估。其中一个系统使用氯进行维护；另一个系统使用二级氯胺消毒。利用基于同步加速器的原位微 X 射线吸收近边结构来评估矿物学。利用原位微 X 射线荧光绘图来演示锰与潜在有毒吸附金属离子之间的空间关系。锰沉积物的厚度从 0.01 到 400 μm 不等。它们主要由 Mn 氧化物/氢氧化物、水钠锰矿（Mn(3+)和 Mn(4+)）和黑锰矿（Mn(2+)和 Mn(4+)）以及 Mn 硅酸盐锰钡矿（Mn(2+)和 Mn(4+)）组成，比例不同。除了铁之外，锰沉积物中还存在铬、锶以及合金元素铅和铜。除铁外，所有这些元素都与特定的健康问题有关，这也是美国环境保护署（U.S. EPA）关注的问题。讨论了 Mn 沉积物的特殊性质，即金属离子的吸附、金属离子的氧化和再悬浮，及其对饮用水质量的影响。
Zotero 插件