Full Description

A high percentage of disinfection byproducts (DBPs) in chlorinated drinking water are unknown and may have potential public health implications. In this work, ultrafiltration (UF) and size exclusion chromatography (SEC) coupled with radioisotope 36 Cl were employed to characterize chlorine-containing DBPs, especially those high molecular weight DBPs in chlorinated natural organic matter samples. The results show that SEC- 36 Cl profiles contained three major peaks and quite a few of minor peaks, which represent the high molecular weight DBPs, Cl - , and relatively low molecular weight DBPs, respectively. UF could effectively remove almost all the Cl - and relatively low molecular weight DBPs. Oxidation was the predominant reaction during chlorination. As contact time increased from 1 to 120 hours, the amount of high molecular weight DBPs decreased, which is very likely due to the formation of more low molecular weight DBPs, and the occurrence of more oxidation reactions. As pH increased from 5.5 to 9.5, the formation of high molecular weight DBPs increased. Compared with SRFA, SRHA produced less amount of DBPs, but those DBPs had relatively higher molecular weight. The separation capability of three HPLC columns for chlorinated SRFA were compared. Most importantly, this work shows that 36 Cl is a good indicator of whether an SEC fraction contains chlorinated DBPs, which is the basis for further separation, concentration, and tandem mass spectrometry analysis; more attention should be paid to the characterization, identification and measurement of high molecular weight DBPs in drinking water. Includes 13 references, figures.

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Edition: Vol. - No. Published: 01/01/2001 Number of Pages: 9File Size: 1 file , 280 KB