中文摘要：

本研究于2014年在北京市采集母乳样品37份,按照国标方法采用高分辨气相色谱-高分辨质谱（HRGC-HRMS）结合同位素稀释技术,测定样品中二英及其类似物含量.总毒性当量的均值为6.74 pg TEQ·g^-1脂肪,多氯代苯并呋喃（PCDD/Fs）和二英样多氯联苯（dl-PCBs）毒性当量的均值分别为5.06 pg TEQ·g^-1脂肪和1.68 pg TEQ·g^-1脂肪.与发达国家和地区相比,北京市普通人群的二英及其类似物负荷水平较低.

英文摘要：

Concentrations of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans（ PCDD/Fs） and dioxin-like polychlorinated biphenyls（ dl-PCBs） in 37 human milk samples collected in 2014 from Beijing residents were determined by high-resolution gas chromatography-high resolution mass spectrometry（ HRGC-HRMS） and isotope dilution methodology. The mean valuesof TEQ,based on WHO TEFs 1998,were 5. 06 pg TEQ·g^-1fat for PCDD / Fs and 1. 68 pg TEQ·g^-1fat for dl-PCBs,giving a total of 6. 74 pg TEQ·g^-1fatfor PCDD / Fs plus dl-PCBs. The TEQ body burdens of the people living in Beijing were lower than those in the developed countries.