Analysis of oxyhalide disinfection by-products and other anions of interest in drinking water by ion chromatography.
The US Environmental Protection Agency is developing regulations for various drinking water disinfection by-products (DBPs). This effort involves developing analytical methods for the DBPs formed as a result of different disinfection treatments and collecting occurrence data for these species. Ion chromatography is one method being used to analyze drinking water samples for the following inorganic DBPs: chlorite, chlorate and bromate. These anions, however, are difficult to separate from common interfering anions of chloride, carbonate and nitrate. A method is therefore presented by which tetraborate/boric acid is used to separate these anions. Method detection limits of the order of 10 micrograms/l, using conductivity and UV detection were obtained. Stability studies of chlorite showing the effectiveness of ethylenediamine as a preservative and summary data for an occurrence of nitrite, nitrate and the DBP precursor bromide are presented.
Hautman
D P
DP
Technology Application Inc., Cincinnati, OH 45268.
Bolyard
M
M
D000838:Anions; D002853:Chromatography, Liquid; D004203:Disinfection; D004563:Electrochemistry; D006219:Halogens / Q000032:analysis*; D007477:Ions; D013056:Spectrophotometry, Ultraviolet; D014881:Water Supply / Q000032:analysis*
D000838:Anions; D006219:Halogens; D007477:Ions