气相色谱-串联质谱法测定土壤中多环芳烃和多氯联苯

研究土壤中持久性有机污染物的含量可以为区域环境治理和来源解析提供基础数据。本文通过固相萃取结合气相色谱-串联质谱法建立了16种多环芳烃和15种多氯联苯的检测方法,并优化了固相萃取净化方法、色谱条件以及质谱碰撞能量。结果表明16种多环芳烃和15种多氯联苯的标准曲线线性关系良好,方法线性相关系数r~20.999,方法的检出限为0.1~2.5μg·kg~(-1),16种多环芳烃的平均加标回收率范围为62.5%~113.5%,相对标准偏差在2.3%~8.2%之间,15种多氯联苯的平均加标回收率范围为62.6%~91.4%,相对标准偏差在5.2%~7.8%之间。方法的准确度和精密度较高,通过对实际样品的测定,说明该方法具有较低的检出限及较强的抗干扰能力,能满足土壤中多环芳烃和多氯联苯的检测要求。

Determination of Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls in Soils by Gas Chromatography-Triple Quadrupole Mass Spectrometry

A method for the determination of 16 polycyclic aromatic hydrocarbons (PAHs) and 15 polychlorinated biphenyls (PCBs) was developed by gas chromatography-triple quadrupole mass spectrometry with ultrasonic extraction.In this study,the pre-treatment method,chromatographic conditions and mass spectrometry conditions were optimised.The results showed that the correlation coefficients of PAHs and PCBs in soils were larger than 0.999,and the limit of detection ranged from 0.1 to 2.5 μg·kg-1.The average recoveries of PAHs were 62.5％-113.5％,and 62.6％-91.4％ for PCBs.The relative standard deviations ranged from 2.3％ to 8.2％ for PAHs,and 5.2％-7.8％ for PCBs.The method has low detection limits and strong anti-interference ability for complex matrix and can be used for determination of PAHs and PCBs in soils.