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目的应用离子色谱法测定生活饮用水中痕量二氯乙酸(DCAA)和三氯乙酸(TCAA)。方法根据离子色谱法原理,先将水样经0.2μm微孔滤膜过滤,在仪器最佳工作条件下,测定阴离子的出峰保留时间及峰面积,以峰面积绘制离子浓度标准曲线。结果线性范围0.02~0.60 mg/L;回归方程相关系数均在0.999 8~0.999 9,线性关系良好;将产生3倍于噪音水平的信号所代表的待测组分的最小浓度计算检出限,二氯乙酸为0.5μg/L,三氯乙酸为5.0μg/L;二氯乙酸0.02~0.30 mg/L和三氯乙酸0.04~0.60 mg/L浓度范围检测的RSD%在3.10%~4.90%,曲线相关性0.999 8~0.999 9,加标回收率均在85.00%~109.00%。结论建立了用离子色谱法直接进样,电导检测饮用水中要求测定中的二氯乙酸、三氯乙酸含量的方法。
Objective To determine the content of trace dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) in drinking water by ion chromatography. Methods According to the principle of ion chromatography, the water sample was first filtered through a 0.2 μm microporous membrane. The peak retention time and peak area of the anion were determined under the optimal working conditions of the instrument. The standard curve of ion concentration was plotted with the peak area. The linear range was from 0.02 to 0.60 mg / L. The correlation coefficients of the regression equations were all within the range of 0.999 8 to 0.999 9. The linearity was good. The detection limit was calculated with the minimum concentration of the analyte represented by the signal at 3 times the noise level. The RSD% of dichloroacetic acid (0.5μg / L) and trichloroacetic acid (5.0μg / L) and dichloroacetic acid (0.02-0.30mg / L) and trichloroacetic acid (0.04-0.60mg / L) were between 3.10% and 4.90% Curve correlation 0.999 8 ~ 0.999 9, recoveries were 85.00% ~ 109.00%. Conclusion The method for direct determination of dichloroacetic acid and trichloroacetic acid in drinking water by ion chromatography was established.