利用SPMD技术监测珠江三角洲大气中多环芳烃

利用半渗透膜被动采样装置(SPMD),对珠江三角洲地区大气中多环芳烃进行了分季度为期一年的监测,同时在广州(GZ01站)用大流量采样器进行主动采样分析.结果表明,SPMD主要采集大气气态多环芳烃,其富集速率Rs受温度影响显著,低温更有利于SPMD对有机物的渗透富集.大气气态PAHs浓度季节差异明显,各季度平均值分别为286.0ng/m³(4～6月),322.0ng/m³(7～9月),216.4ng/m³(10～12月)和153.3ng/m³(1～3月),温度是影响气态PAHs含量高低的主因素.该区域内,污染程度呈南北低、中间高.污染源主要来自于机动车尾气的排放.

Studies on monitoring atmospheric PAHs utilizing SPMD technique in the Pearl River Delta

Atmospheric polycyclic aromatic hydrocarbons (PAHs) were monitored seasonally utilizing semipermeable membrane devices (SPMDs) for a year in the Pearl River Delta. At the same time, active sampling was carried out in Guangzhou (GZ01) using High-volume air sampler. The PAH compounds sampled by SPMD were mainly gaseous PAHs, the enrichment ratio (Rs) was significantly affected by temperature, and lower temperature was more favorable for SPMD sampling. Gaseous PAHs concentration showed obvious seasonal variations, the average concentrations (geometric mean) were 286.0ng/m3 (April-June, 2001), 322.0ng/m3 (July-September, 2001), 216.4ng/m3 (Octable-December, 2001) and 153.3ng/m3 (January-March, 2002), respectively. Temperature was the main factor governing the gaseous PAHs in the air. In the area, the atmospheric PAHs concentration was higher in the center and lower in the north and south, vehicle emissions were considered the mainly source.