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采集了北京市奥林匹克森林公园和西直门北大街2个不同PM_(2.5)污染区的6种植物叶片样品,应用高效液相色谱法测定叶片中多环芳烃(PAHs)的含量,比较6种常见树种叶片对PAHs的吸收特征,并对PAHs的成分具体分析。结果表明:不同树种吸收PAHs的能力有差异。在2个采样点,圆柏、油松针叶树种叶片对PAHs的吸收含量均高于阔叶树种;阔叶树种中碧桃叶片对PAHs的吸收含量最高,其次是毛白扬。此外,随着污染的加重,树种能够增强其吸收PAHs的能力以适应环境污染。6种树种叶片对PAHs的吸收含量均表现为污染较重的西直门高于污染较轻的森林公园。对6种树种叶片的PAHs成分分析表明,叶片中PAHs的主要成分为3环化合物,其次是2环、4环和5~6环化合物,叶片对不同环数化合物的吸收含量也表现为西直门高于森林公园。西直门样品中3环化合物的组分略多于森林公园样品,且组分的含量也高于森林公园样品。6种树种叶片对PAHs吸收含量的主成分分析指出,树种吸收PAHs能力大小依次为圆柏>碧桃>油松>毛白杨>榆树>紫叶李。
Six plant leaf samples collected from two different PM 2.5 contaminated areas in Beijing Olympic Forest Park and Xizhimen North Street were collected. The contents of polycyclic aromatic hydrocarbons (PAHs) in the leaves were determined by HPLC. Six common tree species Leaf absorption characteristics of PAHs, and the composition of PAHs specific analysis. The results showed that there were differences in the ability of different tree species to absorb PAHs. At 2 sampling sites, the content of PAHs in Sabina vulgaris and Pinus tabulaeformis leaves were higher than those in broad-leaved tree species. The content of PAHs in broad-leaved tree species was the highest, followed by that of Populus tomentosa. In addition, as pollution increases, tree species can enhance their ability to absorb PAHs to adapt to environmental pollution. The absorption of PAHs in the leaves of six tree species showed that Xizhimen with higher pollution was higher than the less polluted forest park. Analysis of PAHs in six species showed that the major components of PAHs in leaves were 3-ring compounds, followed by 2-ring, 4-ring and 5-6-ring compounds. The absorption of different ring- In the forest park. The composition of the 3-ring compound in Xizhimen sample is slightly more than that of the Forest Park sample, and the content of the component is also higher than that of the Forest Park sample. The principal component analysis of PAHs uptake by six tree species leaves indicated that the ability of tree species to absorb PAHs in order was Sabina przewalskii, Pinus tabulaeformis, Pinus tabulaeformis, Populus tomentosa and Ulmus pumila.