生活饮用水中二氯乙酸和三氯乙酸的离子色谱电导测定法

Determination of dichloroacetic acid and trichloroacetic acid by ion chromatography in drinking water

目的:建立生活饮用水中二氯乙酸(DCAA)和三氯乙酸(TCAA)的离子色谱检测法。方法:利用Dionex 2100型离子色谱仪,选用IonPac AS19阴离子色谱分析柱,进样体积500μl,10 mmol/L～45 mmol/L氢氧化钾溶液梯度淋洗,流速1.0 ml/min,电导检测器,0.22μm滤膜过滤后直接进样。结果:本法相关性r>0.999,DCAA和TCAA最低检出限分别为0.003 mg/L和0.005 mg/L,RSD%<4.56%,回收率范围85%～104%。结论:本法具有简便快速,灵敏准确及安全实用的特点,适合生活饮用水大批样品的检测。

Objective：To establish a method for the simultaneous determination of DCAA and TCAA in drinking water by the ion chromatography. Methods： The ion chromatograph Dionex 2100 and the anion exchange column Ion PacAS19 were applied, the injection volume was 500 Ixl, gradient eluent was performed by 10 mmol/L - 45 mmol/L KOH solution with flow rate of 1.0 ml/min. Direct injection happened after filtration through 0.22 - μm filter membrane by the electric conductivity detector. Results： The correlation coefficients were over 0.999. The minimal detection limits of DCAA and TCAA were 0. 003 mg/L and 0. 005 mg/L. The relative standard deviations were 〈 4.56%. The recovery rates were between 85% and 104%. Conclusion： This method is simple, accurate, rapid and applicable for detection of lots of samples in drinking water.