吹扫捕集-气相色谱质谱（GC-MS）测定地表水环境中常见VOCs的方法优化研究

目的]对地表水环境中常见VOCs测定方法进行优化。方法]采用吹扫捕集一气相色谱质谱（Gc—MS）法，分析地表水源水中多种挥发性有机物，并对方法条件进行了优化整合，以进一步提升分析效率和方法灵敏度。结果]通过SIM模式测定25种VOCs，空白加标回收率范围为81．5％～123．0％，精密度（相对标准偏差）范围为0．74％一5．62％，方法检出限为0．03-0．59¨g／L，实际水样加标回收率范围为79．5％～125．0％。结论]吹扫捕集一气相色谱质谱联用法测定水中VOCs，具有准确、可靠、重复性好等优点，适用于地表水环境中VOCs的测定。

Study on Improvement of the Method for Deter mination of VOCs in Surface Water by Purge and Trap/ Gas Chromatography-Mass Spectrometer （GC-MS）

Objective ] The study aimed to improve the method for deter ruination of VOCs in surface water. Method] A method for deter mina- tion of VOCs in surface water was established by using purge and trap/gas chromatography-mass spectrometer （GC-MS）, and its conditions were optimized and integrated to improve its analysis efficiency and sensitivity. Result] According to the deter ruination results of 25 kinds of VOCs by SIM （selected ion monitoring） model, the blank standard addition recoveries varied from 81.5% to 123.0% ; the relative standard deviations （RSD） of six parallel deter minations ranged from 0.74% to 5.62% ; the deter mination limits of the method were 0.03 - 0.59 p~g/L; the stand- ard addition recoveries of surface water were 79.5% - 125.0%. Conclusion] The method is accurate, reliable and reproducible for deter ruina- tion of VOCs in surface water.