上海交通沿线农田土壤中PAHs分布特征及源解析

In order to investigate the influence of traffic emission on the accumulation of 16 polycyclic aromatic hydrocarbons (PAHs) known as priority pollutants in the surrounding farmland soils, seventy soil surface samples and two soil cores samples were collected within 500m of the Shanghai traffic artery. The concentrations, compositions and sources of 16PAHs were systematically analyzed. The results showed that the concentrations of Σ₁₆ PAHs in the surface soils of the farmland along the Shanghai traffic artery was 23.16~21250.25ng/g, with an average of 928.16ng/g. Along the increase of distance from roadside shelterbelts, the concentrations of Σ₁₆ PAHs showed a trend of decrease first remove then increase, and finally decrease. The concentrations of Σ₁₆ PAHs in farmland soil cores showed an increasing trend with the decreasing distance from the soil surface. Positive definite matrix factor analysis (PMF) models and isomer ratios were used to distinguish PAHs sources in soil surfaces and core samples. It was found that they were mainly derived from the combustion of coal and biomass and traffic emissions.