交通道路旁茶园多环芳烃的污染特征免费下载

中国环境科学 2008,28(7)：577~581 China Environmental Science 交通道路旁茶园多环芳烃的污染特征 林道辉,朱利中* (浙江大学环境科学系,浙江 杭州 310028) 摘要：采样分析了某交通道路旁茶园多介质环境中多环芳烃(PAHs)的浓度水平,探讨汽车尾气对茶鲜叶中 PAHs 的影响.结果表明,茶园空气、土壤和茶组织中 16 种 PAHs 的总浓度(∑PAHs)分别为 1780.0~4710.0ng/m3、n.d.(未检出)~35.9.0µg/kg 和 100.00~885.00µg/kg,均随交通道路距离增加而降低,说明汽车尾气对茶园环境造成了 PAHs 污染.但离交通道路 50m 和 250m 处的茶组织中的∑PAHs 差异不明显,说明汽车尾气对茶树的 PAHs 污染主要局限在路旁 50m 范围内.茶组织中∑PAHs 的大小顺序为老叶>须根>嫩叶>生产枝>主根,地上部分大于地下部分.嫩叶中 PAHs 以 3 环为主,占∑PAHs 的 80.6%.老叶中 4 环比例高于 3 环,且 5~6 环的比例显著高于嫩叶.在茶树生长过程中,茶鲜叶会逐渐积累环境中毒性更强的高环 PAHs. 关键词：茶叶；汽车尾气；多环芳烃；源解析 中图分类号：X51 文献标识码：A 文章编号：1000-6932(2008)07-0577-05 Characteristic of polycyclic aromatic hydrocarbons in a roadside tea field. LIN Dao-hui, ZHU Li-zhong* (Department of Environmental Science, Zhejiang University, Hangzhou 310028, China). China Environmental Science, 2008, 28(7)：577~581 Abstract：Polycyclic aromatic hydrocarbon (PAH) contents in air, soil, and tea plant samples from a roadside tea field were analyzed, and the contribution of traffic exhausts to the PAHs in fresh tea leaves was discussed. Total concentrations of 16 PAHs (∑PAHs) in the air, soil, and tea samples were 1780~4710ng/m3, n.d.~35.9µg/kg, and 100~885µg/kg, respectively. ∑PAHs decreased with increasing distance from the road curb, implying that traffic exhausts may be the main PAH source to the tea field. However, ∑PAHs of the tea plant at the sampling site of 50 m from the road curb varied little from that of 250 m, indicating that the impact of traffic exhausts on ...