上海某大型化工区周边大气细颗粒物中多环芳烃的分布特征

Distribution Characteristics of Polycyclic Aromatic Hydrocarbons in Fine Particulate Matters in Proximity of a Large Chemical Industrial Park in Shanghai

[目的]了解上海某大型化工区大气细颗粒物(PM2.5)中多环芳烃水平。[方法]在该化工区下风向3 km内的监测点A和下风向30 km的监测点B(对照)分别设置采样点,于2014年6月3—5日连续采样3次,测定PM2.5及PM2.5中16种多环芳烃浓度。[结果]化工区周边大气多环芳烃总质量浓度(13.64±2.25)ng/m3,高于对照区(6.00±1.59)ng/m3,差异有统计学意义(P<0.05);化工区周边大气PM2.5浓度为(70.84±15.35)μg/m3,对照区为(85.74±12.73)μg/m3,差异无统计学意义(P>0.05);化工区周边单位质量PM2.5携带的多环芳烃(201.19 mg/g)约为对照区的(74.64 mg/g)2.7倍,差异有统计学意义(P<0.05)。[结论]上海某大型化工区周边大气多环芳烃浓度较对照区稍高。

[ Objoctive ] To measure the concentrations of polycyctic aromatic hydrocarbons （PAHs） in fine particulate matters （PM2.5） in proximity of a large chemical industrial park in Shanghai, [ Mothods ] The concentrations of PMz5 and 16 PAHs in PM2_~ were determined in area A （in 3 km proximity downwind of the chemical industrial park） and area B （control, 30 km away from the chemical industrial park） after consecutive three days of sampling in 3-5 June 2014. [ Results ] The concentration of total PAHs in area A was （13.64 ~ 2,25） ng/m3, significantly higher than that in area B of （6.00 ± 1.59） ng/m3 （P 〈 0.05）, The concentrations of PM2.S in area Aand area B were （70.84±15.35） p,g/m3 and （85.74 ± 12.73） μg/m3 respectively （P〉0.05）. The weight of PAHs per gram of PM2.5 in area A （201.19mg/g） was about 2.7 times that in area B （74.64mg/g） （P〈0.05）. [ Conclusion ] The levels of PAHs close to the large chemical industrial park in Shanghai are higher than those away from this place.