珠江三角洲典型城市蔬菜中多环芳烃分布特征

Distribution Characteristics of PAHs in Vegetables of Typical City in Pearl River Delta——A Case Study of Dongguan City

在东莞市采集77个蔬菜样品,采用气相色谱-质谱仪对其16种优先控制多环芳烃(PAHs)进行分析。结果表明:东莞市蔬菜中16种PAHs含量在26.35～3748μg/kg之间,平均含量为656.3μg/kg;蔬菜中PAHs含量以3环和4环PAHs为主,单个PAHs以荧蒽、芘和菲含量最高;不同种类蔬菜间PAHs含量差异很大,叶菜类较果菜类蔬菜中的PAHs含量高,主要取决于蔬菜种类间不同的生长结构特征;东莞市的蔬菜受到一定程度的PAHs污染。

77 samples of vegetable were collected from Dongguan City, a typical city of Pearl River Delta and the concentrations of polycyclic aromatic hydrocarbons （16 US EPA priority PAlls） were determined by gas chromatography equipped with a mass spectrometry detector （GC-MS）. The results showed that the concentrations of PAHs in the vegetables ranged from 26.35 to 3748 μg/kg with the mean of 656.3 μg/kg. PAHs were dominated by the 3-ring and 4-ring members, the most abundant individual PAHs were Fluoranthene, Pyrene and Pbenanthrene. The contents of PAHs in leaf vegetables were higher than those in fruit vegetables. The type of vegetable was the main factor that significantly affected the PAHs concentrations. The vegetables from Dongguan City were polluted by PAHs to a certain extent..