title: Risk assessment of butyltins based on a fugacity-based food web bioaccumulation model in the Jincheng Bay mariculture area: I. Model development.
abstract: A fugacity-based model was developed to simulate the bioaccumulation of butyltins in the food web of the Jincheng Bay mariculture area. The predicted biological tissue residues of tributyltin (TBT), dibutyltin (DBT), and monobutyltin (MBT) were 0.04-17.09, 0.14-53.54, and 0.27-108.77 ng-Sn g(-1), respectively, and the predicted values in six mollusca agreed well with the measured ones. The lipid-normalized concentrations did not significantly increase across trophic levels, indicating no biomagnification across aquatic food webs. These results were highly consistent with those observed both in the laboratory and field, which had been reported in numerous references. The explanation, from calculating their flux equilibrium in the food web, was that butyltins were primarily taken in via respiration from the water column by marine organisms. The sensitivities of the model parameters were analyzed, revealing that the hydrophobicity of butyltins played the dominant role in their bioaccumulation phenomena. The verified model predictions of the biotic tissue concentrations of the butyltins could be readily applied to perform internal ecological risk and human health risk assessments in this area.
authors.affiliation: College of Marine Life Sciences, Ocean University of China, No. 5, Yushan Road, Qingdao 266003, China. rusg@ouc.edu.cn.
authors.forename: Yanbing
authors.initials: Y
authors.lastname: Hu
authors.forename: Xianghong
authors.initials: X
authors.lastname: Gong
authors.forename: Yingjiang
authors.initials: Y
authors.lastname: Xu
authors.forename: Xiukai
authors.initials: X
authors.lastname: Song
authors.forename: Huihui
authors.initials: H
authors.lastname: Liu
authors.forename: Xuxiu
authors.initials: X
authors.lastname: Deng
authors.forename: Shaoguo
authors.initials: S
authors.lastname: Ru
mesh_terms: D000818:Animals; D061006:Bays / Q000032:analysis; D004784:Environmental Monitoring; D020387:Food Chain; D019015:Geologic Sediments / Q000032:analysis*; D006801:Humans; D008954:Models, Biological; D009947:Organotin Compounds / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity; D018570:Risk Assessment; D017747:Seafood / Q000032:analysis* / Q000633:toxicity; D014220:Trialkyltin Compounds / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity
chemical_list: D009947:Organotin Compounds; D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; C516409:mono-n-butyltin; C056189:di-n-butyltin; C011559:tributyltin