气溶胶与降尘中多环芳烃的含量分布研究

通过广东省茂名市区四个不同功能点大气气溶胶和降尘中多环芳烃的含量分布研究发现 :1、气溶胶中优控多环芳烃大大高于降尘中的含量 ,为降尘的 5.97～ 1 9.3倍 ;以石化厂区为例 ,非优控多环芳烃在气溶胶中的相对含量更高 ,为降尘的 2 4 .7倍。2、气溶胶中优控多环芳烃和非优控多环芳烃的分布为随分子量增加而含量增高的趋势 ,但降尘中优控多环芳烃的高含量相对集中于萤蒽至苯并 (b)萤蒽之间。3、不同功能区由于排放源的差别所表现出的气溶胶和降尘中优控多环芳烃总量及总量比值、部分强致癌和致癌物含量及含量比值均存在差异。4、对气溶胶和降尘中多环芳烃研究可以对降尘中非优控多环芳烃降解和溶解量进行估算。以石化厂区为例 ,降尘中非优控多环芳烃比原始含量已减少76%。

Study on concentration distributions of polycyclic aromatic hydrocarbons (PAHs) in aerosols and dustfall

The concentration distributions of polycyclic aromatic hydrocarbons (PAHs) in aerosols and dustfall at 4 different function areas were studied in Maoming urban, Guangdong province There are some conclusions as following 1) The concentration of priority PAHs in aerosols was higher 597 to 193 times than in dustfall and concentration of non-priority PAHs in aerosols was higher 247 times than in dustfall at MPCIC 2) The concentration distributions of priority and non-priority PAHs in aerosols are increasing tendency going with enhancing of molecular weight and the higher concentrations of priority PAHs in dustfall were relatively concentrated between fluoranthene to benzo(b)fluoranthene 3) There are differences on total concentrations and its ratios of priority PAHs and concentrations and its ratios of some strong cancinogenic and cancinogenic PAHs in aerosols and dustfall at different function areas on account of discrepancy of release sources 4) The values of degradation and solution of non-priority PAHs in dustfall may be assessed, for example, 76% non-priority PAHs were reduced in dustfall at MPCIC