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目的:建立离子色谱法检测饮用水中三氯乙酸的方法。方法:采用大体积进样检测自来水样品中μg/L级有害三氯乙酸离子,以4.5 mmol/L Na2CO3和0.8 mmol/L NaHCO3的混合溶液为淋洗液,流速为1.0 ml/min,可一次进样检测三氯乙酸与常见阴离子。结果:三氯乙酸浓度在10μg/ml～120μg/ml范围内线性关系良好,回归方程y=46.216x+0.023,r=0.9994(n=6),检出限为2.0μg/L(进样100μl,3倍噪声所相当的量),方法精密度试验,相对标准偏差在2.2%～4.6%之间。对样品加标回收,回收率在94%～97%之间。结论:本方法适用于生活饮用水中的三氯乙酸浓度测定。
Objective: To establish a method for the determination of trichloroacetic acid in drinking water by ion chromatography. Methods: Samples of trichloroacetic acid (μg / L) in tap water samples were detected by large volume injection. The mixed solution of 4.5 mmol / L Na2CO3 and 0.8 mmol / L NaHCO3 was used as eluent at a flow rate of 1.0 ml / min, Injection of trichloroacetic acid and common anions. Results: The linear range of trichloroacetic acid was in the range of 10μg / ml ~ 120μg / ml. The regression equation was y = 46.216x + 0.023, r = 0.9994 (n = 6) with the detection limit of 2.0μg / , 3 times the amount of noise equivalent), method precision test, the relative standard deviation of 2.2% to 4.6%. The sample spike recovery, the recovery rate of 94% to 97%. Conclusion: This method is suitable for the determination of trichloroacetic acid in drinking water.