重工业区空气和大气干湿沉降物中多环芳烃的污染特征

Pollution characteristics of polycyclic aromatic hydrocarbons in the air and atmospheric deposition of heavy industrial district

为了确定重工业城市空气和大气干湿沉降物中多环芳烃污染现状,在柳州钢铁集团有限公司和双冲村附近设置空气被动采样器和大气干湿沉降采集器,利用16种多环芳烃的成分谱,结合其物理化学性质以及柳州市具体情况,确定柳州市大气中PAHs污染状况,结果表明:①柳钢和双冲村空气中∑PAHs浓度分别为519. 44、541. 45 ng·d^(-1),降雨中∑PAHs浓度分别为581. 88、756. 09 ng·m^(-2)·d^(-1),降尘中∑PAHs浓度分别为735. 86、1 558. 51 ng·g^(-1)·d^(-1);②空气中PAHs各环比例为2～3环> 4环> 5～6环,降雨中4环> 2～3环> 5～6环,降尘中4环> 5～6环> 2～3环,确定柳州市大气中PAHs来源于重工企业燃煤生产;③与其他地区相比,研究区大气中PAHs污染严重,PAHs通过直接摄入、呼吸和皮肤接触对人类健康造成潜在威胁。

In order to determine the pollution of polycyclic aromatic hydrocarbons in the air and atmospheric deposition of heavy industrial city,the air passive sampler and atmospheric wet and dry deposition in Liuzhou Iron and Steel Group co.,LTD.,and Shuangchong village,are studied by component spectra of 16 kinds of polycyclic aromatic hydrocarbons,combining with the physical and chemical properties to determine the atmospheric pollution of Liuzhou.The results show that the concentrations of∑PAHs in the air of Liugang and Shuangchong village are 519.44,541.45 ng·d^-1,with an order of 2-3 ring>4 ring>5-6 ring.In rainfall they were 581.88,756.09 ng·m^-2·d^-1,and the order is 4 ring>2-3 ring>5-6 ring,in dustfall were 735.86,1 558.51 ng·g^-1·d^-1,and the order is 4 ring>5-6 ring>2-3 ring.It is confirmed that the PAHs in atmosphere of Liuzhou come from coal burning by heavy industry enterprises and pollution is serious.