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采用吹扫捕集/气相色谱—质谱(GC-MS)法测定水中26种挥发性有机物(VOCs),并对吹扫捕集条件进行优化,分析了吹扫温度和吹扫时间、解吸温度和解吸时间对吹扫捕集效率的影响.分析结果表明,在此条件下,挥发性有机物的线性相关系数为0.999 0～0.999 9,平均加标回收率为94.0%～108.3%,相对标准偏差为2.4%～6.1%,具有较好的线性关系,准确度和精密度;方法检出限为0.03～0.28μg/L,远低于《地表水环境质量标准》(GB 3838-2002)中限值.
Twenty-six volatile organic compounds (VOCs) in water were determined by purge and trap / gas chromatography-mass spectrometry (GC-MS), and the purge and trap conditions were optimized. The purge temperature and purge time, desorption temperature and Desorption time on the purge and trapping efficiency.The results showed that under these conditions, the linear correlation coefficient of volatile organic compounds was 0.999 0 ~ 0.999 9, the average recovery was 94.0% ~ 108.3%, the relative standard deviation was 2.4% ~ 6.1%, with good linearity, accuracy and precision. The detection limit was 0.03 ~ 0.28μg / L, much lower than the limit of “Surface Water Environmental Quality Standard” (GB 3838-2002) .