吹扫捕集气相色谱质谱法测定水中甲基叔丁基醚

Determination of Methyl Tert-Butyl Ether in Water by Purge and Trap Gas Chromatography/Mass Spectrometry

摘要:
目的建立吹扫捕集气相色谱质谱法测定水中甲基叔丁基醚的分析方法。
方法采用吹扫捕集富集水中甲基叔丁基醚, 解吸后用GC/MS测定, 选用特征离子定量。
结果在0~19.4 μg/L浓度范围内, 相关系数为0.999;检出限为0.005 μg/L; 日内、日间相对标准偏差小于14%(n=6);加标回收率在76%~124%之间。
结论该方法灵敏度高、准确度好, 适合于水中微量甲基叔丁基醚的测定。

Abstract:
Objectives To establish a method for determination of methyl tert-butyl ether (MTBE) in water by purge and trap GC/MS.
Methods MTBE in water was purged and trapped by tekmar 9100, then desorbed and analyzed by GC/MS. Selective ion masses were used in quantitative measurement.
Results Within concentration range of 0~19.4 μg/L, the correlation coefficient was 0.999. The method detection limit was 0.005 μg/L. The RSD of intra-day and inter-day were less than 14% (n=6). The spiked recoveries were 76%~124%.
Conclusion Purge and trap gas chromatography/mass spectrometry is a sensitive and accurate method for determination of trace MTBE in water.