交通干线空气中多环芳烃的干、湿沉降

Preliminary exploration of fate of polycyclic aromatic hydrocarbons (PAHs) in air of dry, wet deposil

采集并用液相色谱分析了交通干线尘土、雨水及地表径流水中12种PAHs的浓度,探讨环境空气中PAHs的主要归宿.结果表明,尘土、降雨、地表径流水中PAHs平均浓度分别为648ng/g,2157,3272ng/L.干沉降主要去除空气中4、5环PAHs,湿沉降则主要清除3环PAHs,而干、湿沉降对2环PAHs无明显去除作用.空气是2环PAHs的主要载体,大部分3环和部分4环PAHs则通过直接或间接途径进入水体或通过挥发作用滞留在空气中,尘土是部分4环和5环PAHs的主要贮存地.

The concentrations of 12 kinds of PAHs in the dust of main communication artery, rain and earth＇s surface runoff were collected and analyzed using liquid chromate graph to investigate the main fates of PAHs in surrounding air. The total average PAHs concentrations in dust, rain and the main runoff were 648ng/g, 2157, 3272ng/L, respectively. Dry deposit removed mainly the PAHs of 4, 5 rings in air, wet depoist removed mainly 3-ring PAHs. While dry, wet deposit had no obvious removal action on 2-ring PAHs. Air was the main carrier of 2-ring PAHs. Most past of 3-ring and part of 4-ring PAHs entered waters through direct or indirect way, or detained in air through volatilization. Dust was the main storage place of parts of 4-ring and 5-ring PAHs.