title: [Prediction of PCBs uptake by vegetable in a representative area and evaluation of the human health risk by Trapp model].
abstract: Air, soil and vegetable samples were collected from an e-waste disassembly site and analyzed for characteristic contaminants PCBs. Based on the measured PCBs concentrations in soil and air, PCBs concentration in leafy vegetables was predicted by Trapp Model and the sources, composition of PCBs in vegetable and influencing factors were analyzed. By using human health risk assessment model of USEPA, risk to human health from consumption of vegetable that take up PCBs from environment was evaluated. The results showed that the Trapp Model could give good prediction of PCBs concentrations in leafy vegetables based on PCBs concentration in the soil and air. For instance, the measured sum of seven PCBs in vegetable was 51.2 microg x kg(-1) and the predicted value was 39.9 microg x kg(-1). So the predicted value agrees well with the measured value. The gaseous PCBs were the main source of PCBs in leafy vegetables, and the model predicting results indicated that the contribution rate was as high as 98.8%. The uptake pathway, n-octanol/water partition coefficient (K(ow)) and the n-octanol/air partition coefficient (K(oa)) of PCBs determine the concentration and composition of PCBs in vegetables. The duration needed for PCBs uptake to reach equilibrium was in good correlation with lgK(ow) and lgK(oa). Multiple linear regression analysis indicated that lgK(oa) was more important. Carcinogenic risk from consumption of PCBs contaminated vegetables was 10 000 times higher than that of gaseous PCBs, and the no-carcinogenic risk was increased by approximately 200 times. The main reasons are firstly the vegetables take up and accumulate more toxic PCBs with high-chloride substitutes and consequently the oral toxic factors of PCBs increase dramatically. Secondly, an adult takes 71 times more PCBs via consumption of vegetables than via inhalation of air.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. spdeng@issas.ac.cn
authors.forename: Shao-Po
authors.initials: SP
authors.lastname: Deng
authors.forename: Yong-Ming
authors.initials: YM
authors.lastname: Luo
authors.forename: Jing
authors.initials: J
authors.lastname: Song
authors.forename: Ying
authors.initials: Y
authors.lastname: Teng
authors.forename: Yong-Shan
authors.initials: YS
authors.lastname: Chen
mesh_terms: D000042:Absorption; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000633:toxicity*; D005506:Food Contamination / Q000032:analysis*; D006801:Humans; D008962:Models, Theoretical; D011078:Polychlorinated Biphenyls / Q000633:toxicity*; D018570:Risk Assessment; D014675:Vegetables / Q000737:chemistry / Q000378:metabolism*
chemical_list: D004785:Environmental Pollutants; D011078:Polychlorinated Biphenyls