Document Type
Article
Publication Date
11-21-2024
Keywords
drinking water, chloramine
Abstract
Editor’s summary
Municipal drinking water in the US is often treated with chloramines to prevent the growth of harmful microorganisms, but these molecules can also react with organic and inorganic dissolved compounds to form disinfection by-products that are potentially toxic. Fairey et al. studied a previously known but uncharacterized product of mono- and dichloramine decomposition and identified it as the chloronitroamide anion (see the Perspective by McCurry). This anion was detected in 40 drinking water samples from 10 US drinking water systems using chloramines, but not from ultrapure water or drinking water treated without chlorine-based disinfectants. Although toxicity is not currently known, the prevalence of this by-product and its similarity to other toxic molecules is concerning. —Michael A. FunkAbstract
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–NO2−) as a previously unidentified end product of inorganic chloramine decomposition. Analysis of chloraminated US drinking waters found Cl–N–NO2− in all samples tested (n = 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–NO2− warrants occurrence and toxicity studies in chloraminated water systems that serve more than 113 million people in the US alone.Citation
Erica Sutcliffe et al., Ultrafast all-optical coherence of molecular electron spins in room-temperature water solution.Science386,888-892(2024).DOI:10.1126/science.ads0512
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