固相微萃取-气相色谱-质谱法测定饮用水源中53种挥发性有机污染物

GC-MS Determination of 53 Volatile Organic Compounds in Source of Drinking Water with Solid-Phase Microextraction

应用固相微萃取-气相色谱-质谱法测定饮用水源中53种挥发性有机污染物的含量。优化的试验条件如下:1萃取纤维为DVB/CAR/PDMS;2萃取温度为25℃;3顶空体积为9mL;4萃取时间为10min;5解吸温度为200℃;6解吸时间为3min。在气相色谱分离中用VF-624MS柱为固定相,在质谱分析中采用全扫描模式。53种挥发性有机污染物在一定的质量浓度范围内与其峰面积呈线性关系。方法的检出限(3S/N)在0.001~0.130μg·L-1之间。方法用于实际水样的分析,加标回收率在75.9%~107%之间,测定值的相对标准偏差(n=5)在0.5%~18%之间。

GC-MS was applied to the determination of 53 volatile organic compounds in drinking water combined with solid-phase microextraction.The optimized conditions were as follows:1 extraction fiber:DVB/CAR/PDMS;2 extracting temperature:25 ℃;3 headspace volume:9 mL;4 extraction time:10 min;5desorption temperature:200℃;6desorption time:3min.The VF-624 MS chromatographic column was used for GC separation and the full-scanning mode was adopted in MS determination.Linear relationships between peak area and mass concentration of the 53 volatile organic compounds were in definite ranges,with detection limits(3S/N)in the range of 0.001-0.130μg·L-1.The proposed method was applied to the analysis of actual water samples,giving values of recovery and RSD′s(n=5)in the ranges of 75.9%-107%and 0.5%-18%,respectively.