湖北省部分地区牛奶中多氯联苯的污染水平和暴露分析

目的调查湖北省部分地区牛奶样品中6种指示性多氯联苯(polychlorinated biphenyls,PCBs)的含量水平。方法 2014年在湖北省部分地区共采集了30份本地产牛奶样品,利用同位素稀释-高分辨气相-高分辨磁质谱(HRGC-HRMS)法测定牛奶样品中6种指示性PCBs浓度水平和指纹特征。同时计算湖北省居民单位体重通过牛奶的指示性PCBs的日摄入量,并与国内外研究比较,评估其暴露风险。结果牛奶样品中指示性PCBs总含量为107.2~4 311.2 pg/g fat,平均值为699.9 pg/g fat,中位数为433.9 pg/g fat。牛奶样品中贡献率最高的化合物为PCB-28,其次是PCB-153和PCB-138。湖北省居民单位体重通过牛奶的指示性PCBs的日摄入量的平均值和高端暴露值(以P95计)分别为0.001 47和0.005 25 ng/kg BW。结论湖北省牛奶中指示性PCBs含量处于较低水平,居民通过牛奶摄入指示性PCBs的健康风险较低。

The study on pollution levels and exposure of polychlorinated biphenyls in milk in some areas of Hubei Province

Objective To investigate the levels of six indicator polychlorinated biphenyls (PCBs) in milk samples from some areas of Hubei Province. Methods Thirty locally milk samples were collected in 2014 from some areas of Hubei Province. Concentrations of six indicator PCBs in milk samples were measured by isotope dilution-high resolution gas chromatography-high resolution mass spectrometry (HRGC-HRMS). The daily intake of residents in Hubei Province through milk was calculated and compared with domestic and foreign studies, and the exposure risk was assessed. ResultsThe content of indicator PCBs in milk was 107.2-4 311.2 pg/g fat, the mean and median value was 699.9 and 433.9 pg/g fat, respectively. The compounds with the highest contribution rate in milk samples were PCB-28, followed by PCB-153 and PCB-138. The average and high level (P95) daily intake of residents in Hubei Province through milk is 0.001 47 and 0.005 25 ng/kg BW, respectively. Conclusion The concentrations of indicator PCBs in milk of Hubei were at low level and residents in this province had low health risks through milk intake.