便携式和台式气质联用仪测定水中挥发性有机物的比对研究

Comparing Study of the VOCs in Water Using Portable or Bench-top GC/MS

摘要: 建立了便携式顶空-气相色谱-质谱(HS-GC/MS）、台式HS-GC/MS和台式吹扫捕集-气相色谱-质谱(P&T-GC/MS)3种方法测定水中22种挥发性有机物(VOCs)。通过测定模拟水样中的VOCs，比较了3种方法测定结果的准确度、精密度和检出限。实验结果表明,台式HS-GC/MS和台式P&T-GC/MS测定结果的准确度高、精密度好。与前两种方法相比，便携式HS-GC/MS测定结果的准确度和精密度相对逊色，但其检出限较低，能够满足应急监测工作的需要。

Abstract: The methods for portable and bench-top gas chromatography and mass spectrometry (GC/MS) were established to analyze 22 kinds of volatile organic compounds (VOCs) in water. Portable headspace HS-GC/MS, bench-top HS-GC/MS and bench-top purge and trap (P&T)-GC/MS were employed to determine the VOCs in water. The analytic precision，accuracy and limit of detection of three methods were compared. The results show that the bench-top HS-GC/MS and bench-top P&T-GC/MS have excellent precision and accuracy, while the portable HS-GC/MS has lower limit of detection, which can meet the needs for emergency monitoring.