应用气相色谱-质谱法测定水中24种挥发性有机物的含量。选择顶空平衡温度和时间分别为60 ℃和15 min,用Rtx-1MS色谱柱分离,电子轰击离子源检测。24种挥发性有机物的质量浓度在2.5~20 μg·L-1范围内与其峰面积呈线性关系,方法检出限(3s/k)在0.20~0.94 μg·L-1之间。在3个浓度水平上进行加标回收试验,方法的回收率在75.3%~105.0%之间,相对标准偏差(n=7)在3.2%~12.6%之间。

GC-MS was applied to the determination of 24 volatile organic compounds (VOC′s) in water. The equilibrium temperature and time of head space were selected at 60 ℃ for 15 min. The analyte were separated on Rtx-1MS column. EI source was used in MS. Linear relationships between values of peak area and mass concentration of 24 VOC′s were kept in the range of 2.5-20 μg·L-1. Detection limits (3s/k) found were ranged from 0.02 to 0.94 μg·L-1. Tests for recovery were performed by addition of mixed standard of 24 VOC′s at 3 concentration levels, results of recovery found were in the range of 75.3%-105.0% with RSD′s (n=7) in the range of 3.2%-12.6%.