建立了高分辨气相色谱-高分辨质谱方法分析2，5-二氯酚工业品中的二GFDA1英（PCDD/Fs）和多氯联苯（PCBs）。比较了2，5-二氯酚工业品经甲苯直接溶解后净化、溶解于0.15 mol/L NaOH水溶液中再与正己烷液液萃取后净化两种前处理方法对PCDD/Fs及PCBs出峰峰型和回收率的影响。对于空白样品，两种方法PCDD/Fs及PCBs回收率相差不大。对于实际样品，先溶解于碱液再液液萃取的方法明显优于直接溶解后净化，除PCB 169回收率为49%外，其他所有PCDD/Fs和PCBs组分的回收率都大于80%，均满足标准HJ 77.3—2008和EPA1668C （2010）的质控要求；PCDD/Fs和PCBs的检出限分别为0.005 0~0.044和0.016~0.12 ng/kg；将本方法应用于2，5-二氯酚工业品分析，PCDD/Fs毒性当量浓度为100和135 ng TEQ/g，PCBs毒性当量浓度为6.5和21 ng TEQ/g。

A method using high resolution gas chromatography-high resolution mass spectrometry method is established for the analysis of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) in industrial grade 2,5-dichlorophenol.The sample is pretreated through direct dissolution in toluene and dissolution in 0.15 mol·L^-1 NaOH aqueous solution followed by liquid-liquid extraction with n-hexane,respectively.The chromatographic peaks and recoveries of PCDD/Fs and PCBs are compared.No obvious differences are found in the recoveries of PCDD/Fs and PCBs in the quality blank samples.As for actual samples,the method of dissolution in 0.15 mol/L NaOH aqueous solution followed by liquid-liquid extraction with n-hexane achieves higher recoveries.The recoveries of all PCDD/Fs and PCBs homologous except PCB169 exceed 80%,which meet the quality control requirements of environmental standard methods HJ 77.3—2008 and EPA1668C(2010).The detection limits by this method are 0.005 0-0.044 ng·kg^-1 for PCDD/Fs and 0.016-0.12 ng·kg^-1 for PCBs.This method is used to detect PCDD/Fs and PCBs in two kinds of industrial grade 2,5-dichlorophenol products,indicating that the toxic equivalent quantity concentrations of PCDD/Fs are 100 g TEQ/g and 135 ng TEQ/g,respectively,and that of PCBs are 6.5 and 21 ng TEQ/g,respectively.

袁继委(1973-),男,本科,高级工程师,研究方向为环境监测与分析