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A spatial analysis of disinfection byproducts(DBPs) in public water supplies in Maine showed a progressive prevalence oftrihalomethanes (THM) over haloacetic acids (HAA) with increasing distance from theocean, as well as a parallel increase in total DBPs. Since proximity to the ocean controlsthe deposition of salt from marine aerosols, background chloride was suspected as animportant factor in DBP formation. The experimental approach involved an analysis of theinfluences of chloride and DOC on the formation of different types of DBPs using rawand finished water samples (lakes or rivers) collected from 21 public water supplies inMaine. Sample locations ranged along a 300 km transect from coastal to inland areas.Water samples were analyzed for general water chemistry, specific UV absorbance(SUVA), and DBPs. Additional raw water samples were collected for salt (NaCl)addition experiments while monitoring DBP formation. The character of the DBPsformed was analyzed using chromatography coupled to a novel ultra-high resolutionFourier transform ion cyclotron resonance mass spectrometer (GC/FT-ICR MS).Field data exhibited an inverse relationship between dissolved organic carbon(DOC) and chloride concentrations. There was also a positive relationship betweenSUVA, DOC, and DBPs that probably relates to DOC precursors of DBPs. However,paired samples of raw and finished water showed no correlation between the type of DBPformed and chloride concentrations. Includes 24 references, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 15File Size: 1 file , 830 KB