大港地区大气颗粒物中多环芳烃分布及污染源识别的研究

Study on identifying the distribution and pollution sources of PAHs in airborne particulate in Dagang Area, Tianjin.

多环芳烃（ＰＡＨｓ）是一类对人体危害较大的有机污染物。目前对大气环境中ＰＡＨｓ来源识别技术还处于探索与发展阶段。为了解天津大港油田地区大气环境中ＰＡＨｓ污染状况与来源，对天津市大港地区大气颗粒物中１０种ＰＡＨｓ分布及污染源开展了调查。结果表明：大港地区１０种ＰＡＨｓ总浓度平均为１６９ｎｇ／ｍ３，比市区对照点的４６５ｎｇ／ｍ３低６３．７％，其中苯并（ａ）芘（ＢａＰ）平均浓度为１３．６ｎｇ／ｍ３，比市区对照点的４１．１ｎｇ／ｍ３低６６．９％。实验结果经统计处理发现ＢａＰ浓度与其它９种ＰＡＨｓ浓度存在一定的相关性，相关系数均在０．６０以上。利用比值法进行源识别得出：大港石化区ＰＡＨｓ主要来源为燃煤污染；而大港油田区ＰＡＨｓ主要来源为燃油污染。

Polycyclic Aromatic Hydrocarbons(PAHs) are probably the most widely spread organic pollutants in the environment and some PAHs exhibit carcinogenic effects in humans. The distribution and pollution sources of PAHs in atmospheric particulate were investigated in Dagang Area, Tianjin.The results show that the mean total concentration of 10 PAHs is 169ng/m3 ,63.7% less than that of 465ng/m3 of the urban control sample;the mean concentration of BaP is 13.6ng/m3 ,66.9% less than 41.1ng/m3 in the urban control sample . There exists certain relativity between the concentration of BaP and other 9 PAHs. The ratio of BaP to other PAHs was used as a method to identify that the major source of PAHs was coalcombustion pollution in Dagang petrochemistry industrial zone and oilcombustion pollution in Dagang oilfield zone .