Pollution And Environmental Risk Assessment Of Polychlorinated Biphenyls In Suburban Vegetable Soils In Typical Industrial Cities In Jilin Province

Vegetables are the main agricultural products grown in suburban, in the rapid development of urbanization and industrialization today, more and more attention has been paid to the land pollution in suburban. Soil(Polychlorinated biphenyls,PCBs) have characteristics such as environmental persistence, biological chemicals and high toxicity, easy to accumulate in organisms, and through the amplification effect of the food chain eventually endanger human health. Therefore, study the content and composition characteristics of PCBs in suburban vegetable soils, explore distribution and source of PCBs, and assess environmental risk of PCBs is of great significance for suburban vegetable soil environmental quality and safety and vegetables’ safe production. In this paper, suburban vegetable soils of typical industrial cities of Jilin(Changchun and Jilin) were choosen as the research object to study the pollution status and environmental risks of PCBs in suburban vegetable soil. The main results are as follows:1. The content of PCBs in suburban vegetable soil of typical industrial cities of Jilin Province. Affected by human activities, there is a certain difference between two cities, the content of PCBs in suburban vegetable soil of Jilin City which is given priority to chemicals industry is higher than that in Changchun City which is given priority to car-making, compared with the soil environment quality standard, the pollution level is low; compared with other areas in the country, the PCBs pollution in the study area is in the middle level.2. Composition analysis of PCBs in suburban vegetable siols. Changchun and Jilin Cities suburb vegetable soils are both given priority to high chlorinated PCBs, indicating that soil PCBs pollution comes mainly from the high chlorinated PCBs.3. The distribution of PCBs in suburban vegetable soil. High values of PCBs in Changchun suburb vegetable soils are mainly distributed in northeast suburbs, and there is sporadic distribution near Yitong River southeast. High values of PCBs in Jilin City are mainly distributed in northern suburbs, high value areas in conformity with the major industrial area.4. Analysis of sources of PCBs in the vegetable soils. PCBs pollution in changchun city suburb vegetable soil mainly related to transportation, paint and other industries; PCBs in jilin city suburb vegetable soil is mainly derived from petroleum chemical industry, electric power and other industries, this is consistent with the fact that Changchun and Jilin, respectively, as the car city and the city of petroleum and chemical industry use and production of PCBs containing products, indicating that industrial activity is an important factor affecting the residues of soil pollutants in urban agricultural.5. The analysis of correlation of PCBs in the vegetable soils and soil physicochemical properties. There was no significant correlation between the physical and chemical properties of soil, such as pH, organic matter, and PCBs content.6. Ecological risk assessment of PCBs on suburban vegetable soils. It showed that the ecological risk probability of PCBs in Changchun and Jilin cities suburban vegetable soil are both 10% ~ 50%, for the moderate ecological pollution levels; toxicity equivalent factor method results showed that the toxicity equivalent of PCBs in suburban vegetable soils in two cities are in moderate range, compared with other regions, in the medium level.7. Health risk assessment of PCBs.on suburban vegetable soils. Non cancer risk and cancer risk of PCBs exposure in different land use patterns in Changchun and Jilin were not more than acceptable level, and the health risk was small.