Department of Civil Engineering, University of Arkansas, Fayetteville, AR 72701, USA.
Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092 Zurich, Switzerland.
Science. 2024 Nov 22;386(6724):882-887. doi: 10.1126/science.adk6749. Epub 2024 Nov 21.
Inorganic chloramines are commonly used drinking water disinfectants intended to safeguard public health and curb regulated disinfection by-product formation. However, inorganic chloramines themselves produce by-products that are poorly characterized. We report chloronitramide anion (Cl-N-NO) as a previously unidentified end product of inorganic chloramine decomposition. Analysis of chloraminated US drinking waters found Cl-N-NO in all samples tested ( = 40), with a median concentration of 23 micrograms per liter and first and third quartiles of 1.3 and 92 micrograms per liter, respectively. Cl-N-NO warrants occurrence and toxicity studies in chloraminated water systems that serve more than 113 million people in the US alone.
无机氯胺通常被用作饮用水消毒剂，旨在保障公众健康和控制受管制的消毒副产物的形成。然而，无机氯胺本身会产生特征较差的副产物。我们报告了氯硝酰胺阴离子（Cl-N-NO），它是无机氯胺分解的一个以前未被识别的终产物。对氯化美国饮用水的分析发现，在所测试的所有样本中均存在 Cl-N-NO（n = 40），其浓度中位数为 23 微克/升，第一和第三四分位数分别为 1.3 和 92 微克/升。仅在美国，就有超过 1.13 亿人使用的氯化水系统中，Cl-N-NO 的存在和毒性研究都很有必要。
