南京公园松针中多环芳烃的富集特征与源解析

Enrichment Characteristics and Source Apportionment of Polycyclic Aromatic Hydrocarbons(PAHs) in Pine(Pinus massoniana Lamb) Needles from Parks in Nanjing City,China

采用高效液相色谱测定了南京市8个代表性公园马尾松松针中15种多环芳烃（PAHs）的含量，研究了其组成特征，并采用特征化合物比值法分析了松针中PAHs的来源．结果显示，不同公园松针中PAHs总含量（∑PAHs）范围为909．8（灵谷寺）～2129．6ng·g^-1（莫愁湖公园），平均含量为1438．0ng·g^-1；松针主要富集低环（2、3环）PAHs和中环（4环）PAHs，分别占∑PAHs的66．4％和29．6％，高环（5、6环）PAHs仅占∑PAHs的4％；单种PAHs以菲（Phe）的含量最高，平均含量为591．4ng·g^-1；致癌性最强的苯并（a）芘（BaP）平均含量为5．1ng·g^-1．源解析结果表明，松针中PAHs主要来源于机动车的尾气排放．

The concentrations of 15 polycyclic aromatic hydrocarbons （PAHs） in pine （Pinus massoniana Lamb） needles from 8 urban parks in Nanjing City （China） were determined using High Performance Liquid Chromatography, and the source apportionment of PAHs in pine needles was studied using diagnostic ratios. The results show that the total PAHs concentrations （ ∑ PAHs） accumulated in needles from different parks ranged from 909.8 （Linggu Temple） to 2 129.6 ng · g^-1（ Mochou Lake） , with an average of 1 438.0 ng· g^-1. The PAHs in pine needles mainly associates with 2,3-ring PAHs and 4-ring PAHs, accounting for 66.4% and 29.6% of the PAHs, respectively, while 5,6-ring PAHs only accounts for 4% of the .∑ PAHs. Phenanthrene is the dominant PAH with an average concentration of 591.4 ng · g^-1 The average concentration of Benzo （a） pyrene, the most carcinogenic PAH, is 5.1 ng· g^-1. The source apportionment indicates that vehicle emission is the predominant source for PAHs in the pine needles.