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Marine pollution, ecotoxicology and sustainability
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Biokinetic modeling of Cd bioaccumulation from water, diet and sediment ina marine benthic goby: a triple stable isotope tracing technique
Monday 7th @ 1510-1530, Conference Room 7
Zhiqiang Guo* , Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou 510301, China
Hengzhen Ye, State Key Laboratory of Marine Resource Utilization in South China Sea, College of Marine Science, Hainan University, Haikou 570228, China
Juan Xiao, College of Food Science and Technology, Hainan University, Haikou 570228, China.
ChristerHogstrand, Metals Metabolism Group, School of Life Course Sciences, King's College London, 150 Stamford Street, London SE1 9NH, UK
Li Zhang, Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou 510301, China
Presenter Email: GUOZQ@SCSIO.AC.CN |
| Aquatic animals are often simultaneously exposed to metals through multiple routes in the natural environment. This study explored a triple stable isotope tracing method to quantify simultaneous cadmium(Cd) uptake biokinetics by yellowstripe gobyfromwater (traced by 110Cd), sediment (traced by 111Cd), and diet (traced by 113Cd) when the fish were exposed to Cd for 24 h. The simultaneous uptake of Cd from multiple routes during 4 weeks was then predictedby the modified biokinetic model. The results demonstrated that the uptake rate constant of waterborne 110Cd, sediment-associated 111Cd, and dietary 113Cdwas 3.1 L kg-1 d-1, 2.2x10-4g g-1 d-1 and 3.3x10-3 g g-1 d-1 in the fish. Sedimentary Cd was less bioavailable than the waterborne and dietary Cd, however, sediment could become the predominant Cd source of the total Cd bioaccumulation when the partition coefficient of Cd between sediment and seawater (Kd) is larger than 6x104 L kg-1. The simultaneous uptake of Cd from the three routes could be successfully predicted by the modified model. The model revealed that the Cd bioaccumulation generally increased with the increase of ambient Cd concentration inall the three routes.Overall, our findingsdemonstrated thatthe multiple stable isotopes tracingmethod and the modified biokinetic model have a wide generality and applicability for predicting Cd bioaccumulation under multiple routes of metal exposure scenario and may have application to other metals.
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