Development of a Multichemical Food Web Model: Application to PBDEs in Lake Ellasjen, Bear Island, Norway
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- 作者：Nilima Gandhi ; Satyendra P. Bhavsar ; Sarah B. Gewurtz ; Miriam L. Diamond ; Anita Evenset ; Guttorm N. Christensen ; Dennis Gregor
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：August 1, 2006
- 年：2006
- 卷：40
- 期：15
- 页码：4714 - 4721
- 全文大小：476K
- 年卷期：v.40,no.15(August 1, 2006)
- ISSN：1520-5851
文摘
A multichemical food web model has been developed toestimate the biomagnification of interconverting chemicalsin aquatic food webs. We extended a fugacity-basedfood web model for single chemicals to account for reversibleand irreversible biotransformation among a parentchemical and transformation products, by simultaneouslysolving mass balance equations of the chemicals using amatrix solution. The model can be applied to any numberof chemicals and organisms or taxonomic groups in afood web. The model was illustratively applied to four PBDEcongeners, BDE-47, -99, -100, and -153, in the food webof Lake Ellasj
en, Bear Island, Norway. In Ellasjen arcticchar (Salvelinus alpinus), the multichemical modelestimated PBDE biotransformation from higher to lowerbrominated congeners and improved the correspondencebetween estimated and measured concentrations incomparison to estimates from the single-chemical foodweb model. The underestimation of BDE-47, even afterconsidering bioformation due to biotransformation of theother three congeners, suggests its formation from additionalbiotransformation pathways not considered in thisapplication. The model estimates approximate values forcongener-specific biotransformation half-lives of 5.7, 0.8, 1.14,and 0.45 years for BDE-47, -99, -100, and -153, respectively,in large arctic char (S. alpinus) of Lake Ellasjen.
en, Bear Island, Norway. In Ellasjen arcticchar (Salvelinus alpinus), the multichemical modelestimated PBDE biotransformation from higher to lowerbrominated congeners and improved the correspondencebetween estimated and measured concentrations incomparison to estimates from the single-chemical foodweb model. The underestimation of BDE-47, even afterconsidering bioformation due to biotransformation of theother three congeners, suggests its formation from additionalbiotransformation pathways not considered in thisapplication. The model estimates approximate values forcongener-specific biotransformation half-lives of 5.7, 0.8, 1.14,and 0.45 years for BDE-47, -99, -100, and -153, respectively,in large arctic char (S. alpinus) of Lake Ellasjen.