天津地区表层土壤多环芳烃的分区特征研究

根据实际情况,把天津地区划分为5个地区单元,通过现场采样及室内分析测试,研究了各单元表层土壤多环芳烃的分区特征。结果表明,在划分的5个单元区中,PAHs总浓度及各组分浓度基本上均符合市区>近郊区>滨海区>郊县>远郊县这样的分布规律。在天津的5类地区单元中,土壤PAHs污染物成分谱基本相同。其中,前3类地区(同属于城市化水平高的地区)的成分谱尤为接近;郊县和远郊县的成分谱与前3类地区略有不同,除Nap的高值外,次高值区为Bbf、Bkf和Bap,而不是前3类中的Phe和Fla。此外,PAHs含量大小与各地的单位面积工业总产值的自然对数呈显著正相关,样本可决系数r2=0.8983。这表明,工业化和城市化水平是决定天津地区表土中PAHs含量的重要的社会经济因素。

Characteristics of Topsoil PAHs Distribution in Tianjin Different Areas

Based on the social and natural factors of Tianjin area, the region of Tianjin is partitioned to 5 zones. They are city zone, suburban zone, seashore zone, county zone, and remote county zone. With polycyclic aromatic hydrocarbons (PAHs) sampling data of Tianjin different areas, the basic statistical result showed that the variety of PAHs concentration is distinct in different zones. The concentration of total PAHs and different kinds of PAHs in the city zone is highest, with the order: city zone>suburban zone> seashore zone> county zone> remote county zone. Regression analysis indicates that the variety of PAHs concentration is proportion to the different district economic levels, with the coefficient of regression being 0.898 3, suggesting that the level of industrialization and urbanization is the key social and economical factor to PAHs concentration of Tianjin area.