昆山市大气PM_(2.5)中PAHs污染特征研究

Pollution Characteristics Study of Atmospheric Polycyclic Aromatic Hydrocarbons(PAHs) in PM_(2.5) in Kunshan

使用GC-MS法测定了201 3年昆山市不同地区大气PM2.5中PAHs的污染水平,并用比值法进行了来源简析.研究发现2013年昆山地区一共可检出13种PAHs,年平均浓度范围在0.12 ～ 4.59ng/m3之间,浓度最高的为BghiP.从季节变化看,PAHs季节变化明显,大部分PAHs和∑PAHs浓度值大小为春季＞冬季＞夏季＞秋季.从空间分布来说,城郊的∑PAHs最低,年均值为16.05 ng/m3,其余地区数值较为接近.从PAHs环数分布情况看,从高到低依次为4环＞5环＞6环＞2环＞3环.通过比值法发现,机动车尾气的排放是昆山市PAHs的主要来源.

Pollution level and source of PAHs in PMzs in Kunshan were studied by GC/MS in 2013. It was that 13 kinds of PAHs couldbe found in Kunshan ranging from 0. 12 to 4. 59 ng/m3 , and the highest concentration of PAHs was BghiP . The order of most of PAHs and.PAHs were spring 〉 winter 〉 autumn 〉 summer. The lowest concentration area of PAHs was suburban valued 16.05 ng/m2 ,thevalues were closed to the rest area . The average amounts of the different ring PAHs appeared in the following order： 4-ring 〉 5-ring 〉6-ring 〉 2-ring 〉 3-ring. Through ratio method, found that motor vehicle exhaust emission was the main source of PAHs in Kunshan.