吹扫捕集气相色谱质谱法测定饮用水中挥发性有机物

Determination of volatile organic compounds in drinking water by purge and trap gas chromatography/mass spectrometry

目的建立吹扫捕集气相色谱质谱联用测定饮用水中挥发性有机物的分析方法。方法采用吹扫捕集富集水中挥发性有机物,解吸后用GC/MS测定,选用特征离子定量。结果在36分钟内60种VOCs有效分离,在0μg/L^12μg/L浓度范围内,51种目标化合物的相关系数大于0·995,方法检测限范围为0·021μg/L^0·70μg/L,样品加标回收率在90%~120%之间,响应因子的相对标准偏差小于30%。结论该方法灵敏度高、准确度好,适合于饮用水中挥发性有机物的分析测定。

Objective To establish a method for determination of volatile organic compounds in drinking water by purge and trap GC/MS.Methods Volatile organic compounds in water were purged and trapped by Tekmar 3100, then desorbed and analyzed by GC/MS. Selective ion masses were used in quantitative measurement. Results 60 VOCs were separated and analyzed in 36rain. Within concentration range from 0μg/L to 12μg/L, the correlation coefficient for 51 target compounds was greater than 0.995. The method detection Limits were in the range from 0.021μg/L to 0.70μg/L. Recoveries were between 90 % and 120 %. RF RSD was less than 30 %. Conclusion Purge and trap gas chromatography/ mass spectrometry is a sensitive and accurate method for determination of volatile organic compounds in drinking water.