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This study investigated how the determination ofhaloacetic acid (HAA) in chloraminated samples wasaffected by use of ammonium chloride (NH;sub;4;/sub;Cl), thechlorine quenching agent recommended in U.S. EnvironmentalProtection Agency Method 552.3. Alternativequenching agents and methods were also examined.Study results showed that using NH;sub;4;/sub;Cl to preserveHAA samples obtained from chloraminated watersmay result in positive errors for samples collected atshort contact (or residence) time locations. The magnitudeof these errors in practical applications will varydepending on several factors, including pH, reactivityof dissolved organic matter and concentration at thepoint of chloramination, and chlorine/ammonia application.Among various quenching agents or methodstested, sodium arsenite and stoichiometric amounts ofsodium sulfate were found to be appropriate for chloraminesamples but have some limitations for use inpractical applications.Selection of sample quenching and preservationmethods for HAA determination in chloraminationsystems must be carefully evaluated. In addition, betterquenching methods for HAA determination in chloraminatedwaters are needed. Includes 24 references, figures.

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Edition: Vol. 100 - No. 2 Published: 02/01/2008 Number of Pages: 11File Size: 1 file , 620 KB