本文讨论了奥兰治县水区开发可靠、坚固、低水平检测方法以测定饮用水、地下水和地表水中的高氯酸盐的努力。方法开发使用了Dionex DX 500离子色谱仪。该系统包括一个LC20双系统色谱外壳、一个CD20电导率检测器、一个GP40梯度泵和一个AS40自动进样器。由于比例阀混合的变化，没有使用梯度功能。所有标准和解决方案均采用18兆欧毫欧- Q水。高氯酸盐标准品由高氯酸钠制成。洗脱液氢氧化钠以两种形式购买:颗粒和50%溶液。结果表明，该方法在检测0至500 ppb的高氯酸盐阴离子范围内是可靠的。在低于美国环境保护局设定的4-18 ppb风险水平的水平下可靠检测高氯酸盐阴离子，使该方法成为目前使用的其他方法中极具吸引力的选择。

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.