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Synergistic effects of quenching agents and pH on the stability of regulated and unregulated disinfection by-products for drinking water quality monitoring

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Abstract

Quenching agents (QAs) are widely used in order to prevent the additional formation of disinfection by-products (DBPs) during the sample holding time. In addition, DBP levels are usually stabilized by adjusting the pH of water samples. Previous studies have mostly focused on the individual effects of QAs or of pH on the stability of DBPs in water samples. Considering that disinfectant quenching and pH adjustments are applied simultaneously during routine analyses, it is more appropriate to evaluate the stability of DBPs with all the chemicals (e.g., disinfectants, QAs, buffers) present in the water. This study investigated the synergistic effects of different QAs (ascorbic acid, ammonium chloride, or no quenching) and pH adjustment (3–9) strategies on the stability of different classes of DBPs (i.e., trihalomethanes (THMs), halogenated acetaldehydes (HALs), haloacetonitriles (HANs), haloketones (HKs), and halonitromethane (HNM)). Sample preservation conditions that did not include a QA were shown to be inadequate for GC-ECD analysis, due to interference problems. Ammonium chloride was found to be effective for most DBPs. However, some HALs continued to form in the presence of chloramine, which is a by-product of dechlorination using ammonium chloride. Conversely, using ascorbic acid efficiently inactivated residual chlorine, providing a clean chromatographic baseline. Based on the results of this study, we recommend the use of ascorbic acid for quenching and sulfuric acid for acidifying (pH 3.5) samples. Considering the instability of some DBPs in water matrices over long periods (i.e., 14 days), samples should be processed as soon as possible after collection.

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Abbreviations

BCAL:

Bromochloroacetaldehyde

BCAN:

Bromochloroacetonitrile

BDCAL:

Bromodichloroacetaldehyde

BDCM:

Bromodichloromethane

CH:

Chloral hydrate

DBAN:

Dibromoacetonitrile

DBP:

Disinfection by-product

DBAL:

Dibromoacetaldehyde

DBCAL:

Dibromochloroacetaldehyde

DBCM:

Dibromochloromethane

DCAL:

Dichloroacetaldehyde

DCAN:

Dichloroacetonitrile

DHALs:

Dihalogenated acetaldehydes

11DCP:

1,1-Dichloro-2-propanone

ECD:

Electron capture detector

GC:

Gas chromatography

HALs:

Halogenated acetaldehydes

HANs:

Haloacetonitriles

HKs:

Haloketones

HNM:

Halonitromethane

HPLC:

High-performance liquid chromatography

IS:

Internal standard

MTBE:

Methyl tert-butyl ether

RSD:

Relative standard deviation

SS:

Surrogate standard

SWM:

Simulated water matrix

TBAL:

Tribromoacetaldehyde

TBM:

Tribromomethane

TCAL:

Trichloroacetaldehyde

TCAN:

Trichloroacetonitrile

TCNM:

Trichloronitromethane

THALs:

Trihalogenated acetaldehydes

111TCP:

1,1,1-Trichloro-2-propanone

THMs:

Trihalomethanes

USEPA:

United States Environmental Protection Agency

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Acknowledgements

The authors would also like to thank Sabrina Simard and Michel Bisping for their occasional help in the laboratory during the project.

Funding

Financial support for this project was received by the NSERC (Natural Sciences and Engineering Research Council of Canada) Research Chair on Drinking Water of Laval University, whose main partners are cities of Québec, Lévis and St. Jérôme, Avensys Solutions, SNC-Lavalin, Association pour la protection de l’environnement du lac Saint-Charles et des Marais du Nord.

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Correspondence to Manuel J. Rodriguez.

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Gao, J., Proulx, F. & Rodriguez, M.J. Synergistic effects of quenching agents and pH on the stability of regulated and unregulated disinfection by-products for drinking water quality monitoring. Environ Monit Assess 192, 143 (2020). https://doi.org/10.1007/s10661-020-8112-x

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