吹扫捕集-气相色谱/质谱法测定水中二甲氧基甲烷

Determination of Dimethoxymethane in Water by Purge-and-Trap Gas Chromatography/Mass Spectrometry

[目的]建立吹扫捕集-气相色谱，质谱检测水中二甲氧基甲烷的方法。[方法]利用吹扫捕集富集水中二甲氧基甲烷，解吸后用气相色谱，质谱法测定，选用特征离子外标法定量。[结果]方法在试验浓度范围内线性良好（r=0．9995），检出限为0．03μg/L，回收率为95．2％-99.3％，相对标准偏差为2．18％-3．87％。[结论]该方法准确性好、灵敏度高，适合于水中二甲氧基甲烷的检测。

[ Objective ] To establish a method for the determination of dimethoxymethane in water by purge-and-trap gas chromatography/mass spectrometry （GC/MS）. [ Methods ] The dimethoxymethane in water were purged and trapped, then desorbed and analyzed by gas chromatography/mass spectrometry. The external standard method applied characteristic ions for quantification. [ Results ] The linearity of the method was good under the experimental condition of dimethoxymethane （r=0.9995）. The detection limit was 0.03 I.tg/L. The recovery rates were 95.2%-99.3%, and the relative standard deviations （RSD） were 2.18%-3.87%. [ Conclusion ] The purge-and-trap gas chromatography/mass spectrometry is a sensitive and accurate method for determination Of dimethoxymethane in water.