4.8 Article

Simple and Sensitive Method for Synchronous Quantification of Regulated and Unregulated Priority Disinfection Byproducts in Drinking Water

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ANALYTICAL CHEMISTRY
卷 95, 期 29, 页码 10975-10983

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AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.3c01013

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Due to the high concentrations of disinfection byproducts (DBPs) in drinking water, compared to other emerging environmental contaminants, DBPs have become a global concern. We have developed a simple and sensitive method for simultaneously measuring 9 classes of DBPs. This method overcomes the weaknesses of other methods, particularly for HAAs/IAAs and mono-/di-HALs, and provides a useful tool for studying regulated and unregulated priority DBPs.
Dueto their elevated concentrations in drinking water,comparedto other emerging environmental contaminants, disinfection byproducts(DBPs) have become a global concern. To address this, we have createda simple and sensitive method for simultaneously measuring 9 classesof DBPs. Haloacetic acids (HAAs) and iodo-acetic acids (IAAs) aredetermined using silylation derivatization, replacing diazomethaneor acidic methanol derivatization with a more environmentally friendlyand simpler treatment process that also offers greater sensitivity.Mono-/di-haloacetaldehydes (mono-/di-HALs) are directly analyzed withoutderivatization, along with trihalomethanes (THMs), iodo-THMs, haloketones,haloacetonitriles, haloacetamides, and halonitromethanes. Of the 50DBPs studied, recoveries for most were 70-130%, LOQs for mostwere 0.01-0.05 & mu;g/L, and relative standard deviationswere <30%. We subsequently applied this method to 13 home tap watersamples. Total concentrations of 9 classes of DBPs were 39.6-79.2 & mu;g/L, in which unregulated priority DBPs contributed 42% oftotal DBP concentrations and 97% of total calculated cytotoxicity,highlighting the importance of monitoring their presence in drinkingwater. Br-DBPs were the dominant contributors to total DBPs (54%)and total calculated cytotoxicity (92%). Nitrogenous DBPs contributed25% of total DBPs while inducing 57% of total calculated cytotoxicity.HALs were the most important toxicity drivers (40%), particularlyfour mono-/di-HALs, which induced 28% of total calculated cytotoxicity.This simple and sensitive method allows the synchronous analysis of9 classes of regulated and unregulated priority DBPs and overcomesthe weaknesses of some other methods especially for HAAs/IAAs andmono-/di-HALs, providing a useful tool for research on regulated andunregulated priority DBPs.

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