某废旧电器拆解场家禽和农产品类二恶英多氯联苯含量及人体摄入量
Dioxin-Like Polychlorinated Biphenyls in Agricultural Products and Dietary Intake of Residents in an Electronic Waste Dismantling Area
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摘要:
目的 研究某废旧电器拆解地区自产农产品中类二恶英多氯联苯(DL-PCBs)的水平,并对居民DL-PCBs每日摄入量进行估算。 方法 选择某废旧电器拆解地区散养鸡鸭、自产稻米和白菜为研究对象,利用同位素稀释高分辨磁质谱法测定其12 种DL-PCBs 的含量,采用世界卫生组织毒性当量因子(WHO-TEF,1998)计算毒性当量(TEQ),估算当地成年居民每天通过上述食物摄入的DL-PCBs。 结果 散养鸡鸭组织、白菜和稻米中DL-PCBs 的含量分别为1.85~557.97 pg TEQ/g 湿重、0.77~1.12 pg TEQ/g 湿重和 0.28 pg TEQ/g 干重。单邻位-PCBs 含量超过90%,其中,PCB118 是含量最高的DL-PCBs。在12 种DL-PCBs 中PCB126 的TEQ比例最高。居民通过散养鸡鸭、自产稻米和白菜摄入的DL-PCBs约为2.74 pg TEQ/(kg 体重& #183;d),为世界卫生组织每日容许摄入量的1.8 倍。 结论 居民通过食用当地散养的鸡鸭、稻米和白菜会增加其体内DL-PCBs 的负荷,存在潜在的健康风险。 Abstract:Objective To measure dioxin-like polychlorinated biphenyls (DL-PCBs) in agricultural products and dietary intake of residents in an electronic waste (E-waste) dismantling area. Methods Samples of free range poultries, rice, and cabbage were selected from the area and 12 DL-PCBs were measured by high resolution gas chromatograph-high resolution mass spectrometry (HRGC-HRMS). Toxic equivalent (TEQ) concentrations were calculated using World Health Organization's toxic equivalent factors (WHO-TEF, 1998). The dietary intakes of DL-PCBs of the residents by consuming poultries, rice, and cabbage were estimated. Results The DL-PCBs levels in the samples were 1.85-557.97 pg TEQ/g wet weight (poultries), 0.77-1.12 pg TEQ/g wet weight (cabbage), and 0.11-0.50 pg TEQ/g wet weight (rice). PCB118 was the dominant congener and over 90% of the total DL-PCBs were mono-ortho PCBs. PCB126 contributed the highest TEQ proportion among all the DL-PCBs congeners detected. The estimated dietary intake level of DLPCBs from free range poultries, rice, and cabbage was 7.24 pg TEQ/kg body weight per day, 1.8 times as the tolerable dietary intake level established by the World Health Organization. Conclusion The residents eating free range poultries, rice, and cabbage provided by local farms in an E-waste dismantling area are at healthy risk of having an elevated DL-PCBs intake level.
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