吹扫捕集-气相色谱/质谱法测定土壤中挥发性有机化合物

Determination of Volatile Organic Compounds in Soil Samples by Gas Chromatography-Mass Spectrometry with Purge and Trap Pretreatment

建立了吹扫捕集-气相色谱／质谱技术测定土壤中挥发性有机化合物的方法，对标准模拟样品的基体选择、吹扫捕集条件、色谱条件等实验条件进行了考察。结果表明，方法检出限为0．20～0．60μg/kg，精密度（RSD，n=7）为2．78％～9．89％，基体加标平均回收率为81．5％～115．2％。方法准确可靠，用于批量样品的实际分析，检测结果良好。

A method for the determination of volatile organic compounds in soil samples by gas chromatography-mass spectrometry（GC-MS） with purge and trap pretreatment was established. The factors influencing the determination such as the choice of matrix used as standard simulation sample, the condition of purge and trap and the qualification of GC were discussed. The detection limits of the method for the volatile organic compounds are 0.20 - 0.60 μg/kg and the average recovery of matrix standard addition is 81.5% -115.2% with precision of 2.78% - 9.89% RSD （n =7）. The method has been applied to the determination of volatile organic compounds in soil samples with satisfactory results.