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目的:建立气相色谱法测定生活饮用水中氯乙酸的检测方法,并应用于水样的检测。方法:水样经硫酸酸化,以含内标的甲基叔丁基醚萃取后,甲酯化衍生GC-ECD测定。同时测定加标回收率和精密度及实际水样。结果:本法的加标回收率在90%以上,6份平行样品测定的相对标准偏差(RSD)二氯乙酸为1.8%,三氯乙酸为1.9%,检出限依次为0.83μg/L和0.4μg/L。DCAA在0~80μg/L、TCAA在0~40μg/L内均具有良好的线性,工作曲线相关系数均>0.99。测定了深圳市部分出厂水和末梢水样,大部分水样均含有氯乙酸消毒副产物。结论:本法具有良好的准确度和精密度,适用于生活饮用水中氯乙酸的检测。
Objective: To establish a method for the determination of chloroacetic acid in drinking water by gas chromatography and to detect water samples. Methods: The aqueous sample was acidified by sulfuric acid and extracted with methyl tert-butyl ether containing internal standard. The methyl ester was analyzed by GC-ECD. Simultaneous determination of spiked recoveries and precision and actual water samples. Results: The spiked recoveries were over 90%. The relative standard deviations (RSDs) of the six samples were 1.8% for dichloroacetic acid and 1.9% for trichloroacetic acid. The detection limits were 0.83μg / L and 0.4 μg / L. DCAA had good linearity at 0 ~ 80μg / L and TCAA at 0 ~ 40μg / L, the correlation coefficient of working curve was> 0.99. Determination of part of the factory in Shenzhen water and peripheral water samples, most of the water samples contain chloroacetic acid disinfection by-products. Conclusion: This method has good accuracy and precision, suitable for the detection of chloroacetic acid in drinking water.