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目的建立吹扫捕集-气相色谱-质谱联用法同时测定生活饮用水中30种低沸点有机化合物的方法。方法样品进入吹扫捕集仪,在选定的条件下经吹扫、捕集、脱附等步骤,待测目标化合物转换为气态进入中等极性色谱柱,在优化的色谱条件下分离后,各组分依次进入质谱检测器,在根据SCAN扫描30种有机化合物的结果而建立的SIM方法下进行检测,以保留时间及选定的定性离子定性,以定量离子峰面积与标准比较定量。结果 30种有机化合物在0.05μg/L~5.00μg/L时线性关系良好,其相关系数(r)均>0.998,方法的检出限为0.003μg/L~0.02μg/L。在低、中、高3种浓度水平下的加标回收率分别为83.6%~104%、91.6%~107%、93.1%~103%,RSD分别为3.3%~7.8%、1.9%~6.4%、2.2%~5.6%。结论本法结果准确可靠,适用于生活饮用水中30种低沸点有机化合物的定性、定量测定。
Objective To establish a method for the simultaneous determination of 30 low boiling point organic compounds in drinking water by purge and trap - gas chromatography - mass spectrometry. Method The sample enters into a purge and trap device and is subjected to steps of purging, trapping and desorption under the selected conditions. The target compound under test is converted into a gaseous phase into a medium polarity chromatographic column, and after being separated under optimized chromatographic conditions, Each component sequentially entered the mass spectrometer detector and was detected under the SIM method established based on the results of SCAN scanning of 30 organic compounds. The retention time and the qualities of the selected qualitative ions were determined. Quantitative ion peak area was compared with the standard. Results The linearity of 30 organic compounds was good at 0.05μg / L ~ 5.00μg / L with the correlation coefficient (r)> 0.998. The detection limit of the method was 0.003μg / L ~ 0.02μg / L. The spiked recoveries were 83.6% -104%, 91.6% -107% and 93.1% -103% at the low, medium and high levels, respectively. The RSDs were 3.3% -7.8%, 1.9% -6.4% , 2.2% ~ 5.6%. Conclusion The results of this method are accurate and reliable. It is suitable for the qualitative and quantitative determination of 30 kinds of low boiling point organic compounds in drinking water.