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This paper discusses the Orange County Water District's effort to develop a reliably rugged, low level detection method for the determination of perchlorate in drinking water, groundwater, and surface water. The method development used a Dionex DX 500 Ion Chromatography instrument. The system includes a LC20 dual system chromatography enclosure, a CD20 Conductivity Detector, a GP40 Gradient Pump, and an AS40 autosampler. Because of variations in the proportioning valve mixing, the gradient capability was not used. All standards and solutions were made with 18 megohms Milli-Q water. The perchlorate standards were made from sodium perchlorate. The eluent sodium hydroxide was purchased in two forms, pellets and 50% solution. Results show this method to be reliable in the detection of the perchlorate anion range of zero to 500 ppb. Reliable detection of the perchlorate anion at levels below the 4-18 ppb risk level set by the US Environmental Protection Agency makes this method an extremely attractive choice over other methods currently in use.

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Published: 01/01/1998 ISBN(s): 0898679796 Number of Pages: 8File Size: 1 file , 33 KB