工作场所空气中多氯联苯类化合物的气相色谱-质谱测定法

Method for determination of polychlorinated biphenyl in occupational atmospheres by gas chromatography-mass spectrometry

目的建立工作场所空气中多氯联苯类化合物的气相色谱-质谱（GC-MS）检测方法。方法空气中的多氯联苯用超细玻璃纤维滤膜采集，用正己烷和丙酮洗脱，经色谱柱分离，质谱检测器检测，以保留时间和特征离子定性，峰面积定量。结果空气中的多氯联苯在5—500ng／ml范围内有良好的线性关系，相关系数r=0．9994，最低检出浓度为0．11mg／m3（以采集15L空气样品计），批内精密度RSD为3．2％-4．9％，批间精密度RSD为4．4％～6．2％，加标回收率为91．6％～94．9％。结论该方法灵敏、准确，适用于工作场所空气中多氯联苯类化合物的测定。

Objective To develop the method for determination of polychlorinated biphenyl （PCBs） in occupational atmosphere by gas chromatography-mass spectrometry （GC-MS）. Methods Polychlorinated biphenyl was absorbed by ultra-fine glass fiber filter and then desorbed by hexane and acetone and analyzed by GC-MS. Results PCBs in the range of 5-500 ng/ml had a good linear relationship, the correlation coefficient was 0.999 4, the minimum detectable concentration was 0.11 mg/m3 （15 L to collect air samples）, within run precision relative standard deviation was 3.2%-4.9%, between run precision relative standard deviation was 4.4%-6.2%, the recovery rate was 91.6%-94.9%. Conclusion The method is applicable to the determination of PCBs in the air of workplace.