西藏农田土和农作物中多氯联苯的分布、环境行为和健康风险评估Distribution,Environmental Behavior,and Health Risks of Polychlorinated Biphenyls in the Tibetan Agricultural Soil and Crops
王传飞;龚平;王小萍;姚檀栋;
摘要(Abstract):
南亚排放的多氯联苯类污染物(PCBs)可随大气传输到西藏南部,并沉降到农田等区域。农田中的PCBs能够经食物链进入人体,从而可能对人体健康产生影响。但目前尚无西藏农田PCBs环境过程和农作物健康风险评估的研究。本研究通过同步采集西藏农田土壤和农作物,发现西藏农田土壤、青稞和油菜PCBs的浓度均值分别为5.1 pg·g-1dw、13.5 pg·g-1dw和10.9 pg·g-1dw,低于全球其他地区。青稞和油菜对PCBs的生物富集系数都大于1,说明PCBs在农作物中发生了生物富集现象。模型模拟结果显示,农田土壤中99.6%的PCBs都富集在土壤有机质中,只有0.38%的PCBs进入了植物根系。因此,青稞直接从大气中吸收PCBs是其对PCBs积累和富集的主要途径。基于饮食结构(青稞、牛肉、牛奶和酥油),西藏人群PCBs摄入均值为0.75 ng·kg-1bw·d-1,低于安全阈值约一个数量级。PCBs的食物摄入不会对西藏居民健康状况产生明显影响。
关键词(KeyWords): 多氯联苯;西藏;空间分布特征;逸度模型;健康风险
基金项目(Foundation): 国家自然科学基金(41222010,41571463)
作者(Author): 王传飞;龚平;王小萍;姚檀栋;
Email:
DOI:
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