顶空气相色谱法测定水中1,1-二氯乙烯

Determination of 1,1-dichloroethene in Water by Head Space Gas Chromatography

目的为制定1 ,1_二氯乙烯浓度的国家标准检验方法提供依据。方法建立了测定水中1,1_二氯乙烯浓度的顶空气相色谱法。结果方法有较好的分离能力 ,检出限为0.2μg/L ,线性较好 ,相关系数r=0.9995(n=6)。对未检出1,1_二氯乙烯的生活饮用水加标1,1_二氯乙烯10.0、20.0、40.0μg/L ,回收率分别为108%、101 %和97 % ,相对标准偏差 (RSD)分别为4.6%、4.2 %和2.8 %。对未检出1,1_二氯乙烯的水源水加标1,1_二氯乙烯10.0、20.0、40.0μg/L ,回收率分别为92%、94%和97 % ,RSD分别为7.0 %、5.0 %和3.3 %。结论该方法简单、方便、有效 ,回收率和精密度均能满足实验要求。

Objective To provide scientific basis for formulating National Standard Method for determination of 1,1_dichloroethene in water. Methods The method of head space gas chromatography was established in this assay. Results This method revealed good seperating efficiency and good linear relationship (r=0.9995,n=6). The detection limit was 0.2 μg/L. The recovery rates of the blank drinking water samples to which was added standard solution containing 10, 20 and 40 μg/L 1,1_dichloroethene respectively were 108%, 101% and 97% respectively, their related standard deviations were 4.6%, 4.2% and 2.8% respectively. Under the similar procedure as above, the recovery rates of the blank source water samples, added with standard solution containing 10, 20 and 40 μg/L respectively, were 92%, 94% and 97%, their related standard deviations were 7.0%, 5.0% and 3.3% respectively. Conclusion This method was simple, convenient and effective. The levels of recovery rates and precision of this method all accorded with the requirements of the determination of 1,1_dichloroethene in water.