MULTISPECTRAL IDENTIFICATION OF CHLORINE DIOXIDE DISINFECTION BY-PRODUCTS IN DRINKING-WATER

This paper discusses the identification of organic disinfection byprod ucts (DBPs) at a pilot plant in Evansville, IN, which uses chlorine di oxide as a primary disinfectant. Unconventional multispectral identifi cation techniques (gas chromatography combined with high- and low-reso lution electron-impact mass spectrometry, low-resolution chemical ioni zation mass spectrometry, and Fourier transform infrared spectroscopy) were used to identify more than 40 DBPs in finished water at a chlori ne dioxide pilot plant in Evansville, IN. Treatment variations include d the use of liquid versus gaseous chlorine dioxide and the use of res idual chlorine. Among the more unusual compounds identified were a:ser ies of maleic anhydrides, which are believed to have been formed from maleic acids during the extraction and concentration process, and halo propanones.