福州市蔬菜基地土壤重金属和多环芳烃的含量及其与土壤磁性指标的关系

In this paper, the soil pollution status of vegetable base is closely related to humans' health. In this study, the pollution status of 6 types of heavy metals and 15 US EPA priority PAHs in soils of vegetable base in Fuzhou city was investigated, and their relationships with the parameters of soil magnetic susceptibility were analyzed. The results showed that the average contents of heavy metals in soils were 146.95, 54.99, 45.52, 21.26, 16.00, and 0.61 mgokg-1 for Zn, Pb, Cu, Cr, As, and Cd, respectively. The total contents of PAHs ranged from 324.26 to 1838.62 μgokg-1. The contents of Cu and total PAHs in soils were both significantly correlated with soil magnetic susceptibility (χ) (p<0.05). From a combination of PAH ratios and the result of soil frequency dependent susceptibility (χfd), it can be inferred that the main sources of PAHs were the leakage of petroleum and the combustion of biomass while thesources of heavy metals were complicated, including the emission of human activity and the heavy metals in soil parent material. Theresults of pollution assessment index indicated that the soil contents of Cr and As did not exceede the standards, but the soil contents of Cu, Zn and Cd exceeded the standards. According to the standard for soil remediation in Netherlands, the contents of PAHs in 11.1 % of soil samples exceeded the target value, however, 22.2 % of soil samples exceeded the standard.according to the technical provision for the assessment of soil pollution status in China.