顶空-气相色谱法测定水中溴乙烷

Headspace-Gas Chromatography for the Determination of Bromoethane in Water

建立了顶空-气相色谱法测定环境中不同基质水样中溴乙烷的方法,分别考察了顶空平衡温度、平衡时间、离子强度对溴乙烷富集的影响,从而确定最佳方法参数。结果表明,溴乙烷在0. 10~10. 0μg/L范围内线性关系良好,相关系数(r)为0. 999 0,检出限为0. 012μg/L,测定下限为0. 048μg/L,加标回收率为86. 7%~104. 7%,相对标准偏差(RSD)为2. 9%~4. 8%。该方法准确度和精密度高、检出限低,能够满足环境中不同基质水样中溴乙烷的检测要求。

An analytical method for the determination of bromoethane in different matrix water samples in the environment by headspace gas chromatography was established. The effects of headspace equilibrium temperature,equilibrium time and ion strength on bromoethane enrichment were investigated,and the optimal method parameters were determined. Samples were equilibrated by headspace,separated by capillary column,and detected by an electron capture detector,bromoethane showed a good linear relationship in the range of 0. 10 ~ 10. 0 μg/L. Correlation coefficient was 0. 999 0. The detection limit was 0. 012 μg/L,and the limit of quantitation is 0. 048 μg/L. The spiked recovery was in the range of 86. 7% ~ 104. 7%,and the RSD ranged from2. 9% ~ 4. 8%. The method exhibited high accuracy and precision and low detection limit,which can meet the detection requirements of bromoethane in water samples of different substrates in the environment.