论文部分内容阅读
目的建立同时测定水中15种卤代烃的顶空气相色谱方法。方法水中的微量卤代烃经顶空气液分配后,用DB-624宽口径毛细管柱进行分离,对色谱条件、水浴平衡温度、平衡时间、气液相体积比等影响因素进行研究和优化。结果在所建立的最佳实验条件下能有效地分离水中的15种卤代烃。各组分的保留时间稳定,峰形对称,15种卤代烃能达到基线分离,线性范围能满足测定要求。标准曲线的相关系数为0.998 7~0.999 6,各组分的检出限为0.01μg/L~2.22μg/L,精密度RSD为2.04%~2.56%,加标回收率为88.6%~103.8%。同一样品瓶重复进样最多只能3次;适宜的气液体积比为1∶2。结论本法准确、简便,适合水中15种卤代烃的同时检测分析。
Objective To establish a headspace gas chromatographic method for the simultaneous determination of 15 halogenated hydrocarbons in water. Methods The trace amounts of halohydrocarbons in water were partitioned by headspace gas and separated by DB-624 wide-bore capillary column. The factors such as chromatographic conditions, equilibrium temperature of water bath, equilibration time and gas-liquid volume ratio were studied and optimized. Results Under the best experimental conditions, 15 kinds of halohydrocarbons in water can be effectively separated. The retention time of each component is stable, peak shape symmetry, 15 kinds of halogenated hydrocarbons can achieve baseline separation, the linear range can meet the determination requirements. The correlation coefficient of standard curve was 0.998 7-0.9999 6, the detection limits of each component were 0.01μg / L ~ 2.22μg / L, the RSD of precision was 2.04% ~ 2.56%, and the recoveries were 88.6% -103.8% . The same sample vial repeated injections up to 3 times only; suitable gas-liquid volume ratio of 1: 2. Conclusion This method is accurate, simple and suitable for the simultaneous detection and analysis of 15 halogenated hydrocarbons in water.