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目的建立同时检测水中28种挥发性有机物的吹扫捕集-气相色谱-质谱方法,并研究水样保存时间对测定结果的影响。方法经吹扫捕集对水中28种挥发性有机物进行富集,气相色谱分离后,采用选择离子模式质谱检测。结果 28种挥发性有机物,在1.00μg/L~100μg/L范围内线性关系良好,方法检出限范围0.0429μg/L~0.333μg/L,加标回收率范围95.2%~114%,方法精密度范围1.38%~6.39%。结论本方法操作简便、快速、选择性好,准确度高,可用于水中28种挥发性有机物的同时测定。
OBJECTIVE To establish a simultaneous purge-trap-gas chromatography-mass spectrometry (GC-MS) method for the simultaneous determination of 28 volatile organic compounds in water and to study the effect of water sample storage time on the determination results. Methods 28 kinds of volatile organic compounds in water were collected by purge and trap. After gas chromatographic separation, they were detected by selective ion mode mass spectrometry. Results The linear relationship of 28 volatile organic compounds in the range of 1.00μg / L to 100μg / L was good. The limits of detection ranged from 0.0429μg / L to 0.333μg / L, and the spiked recoveries ranged from 95.2% to 114%. The precision Degree range 1.38% ~ 6.39%. Conclusion The method is simple, rapid, selective, and accurate. It can be used for the simultaneous determination of 28 volatile organic compounds in water.