成都市城东道路灰尘中典型多环芳烃的液相色谱测定及其来源分析

HPLC and sources of typical PAHs in Chengdu urban road dust

城市道路灰尘中的多环芳烃在一定程度上可以反映邻近区域多环芳烃的排放情况.作者采用超声波溶剂提取、自制硅胶层析柱净化和高效液相色谱分离,建立了城市道路灰尘中菲和蒽、荧蒽和芘、苯并[a]蒽和（窟）等3对多环芳烃同分异构体的分离分析方法.该方法精密度优于4％,检出眼（质量分数）为（1.6～4.7）×10-9,回收率为72％～92％.用该方法测定了成都市城东不同功能区道路中6种多环芳烃的含量,总质量分数在（1.57～7.15）×10-6.多环芳烃含量分布表明人口密集、工业活动及交通要道等功能区道路灰尘中多环芳烃含量高.源解析结果显示研究区道路灰尘中多环芳烃主要来源于附近的石油、机动车尾气和有机物质燃烧.

Polycyclic aromatic hydrocarbons （PAHs） has been concerned because of their toxicity,bioaccumulation,and semi-volatile,and persistence in the environment.The PAHs in urban road dust can reflect the emissions of PAHs in the adjacent areas of the road to some extent.This paper proposes a separation and analysis method of phenanthrene and anthracene,fluoranthene and pyrene,benzo [a] anthracene and chrysene in urban road dust with the precision of better than 4％,detection limit （mass fraction） of （1.6～4.7） × 10-9 and recoveries of 72％～92％.The PAHs in road dust from different functional areas of Chengdu have been determined by this method.The total mass fraction is （1.57～7.15）×10-6.The content distribution and source apportionment of PAHsindicate that PAHs in the road dust are mainly from emissions of the sampling sites nearby.