Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 12, Pages 3390-3397Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.08.031
Keywords
Dioxins; Biokinetics; Exposure; Copepods; Fish
Categories
Funding
- University Grants Committee of the Hong Kong Special Administrative Region, China [AoE/P-04/04]
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Despite the great concerns about dioxins in the marine environments, the biokinetics and bioaccumulation of these compounds in marine organisms remains little known. Using radioactive tracers the aqueous uptake, dietary assimilation efficiency, and elimination of dioxins were measured in marine phytoplankton, copepods and seabream. The calculated uptake rate constant of dioxins decreased with increasing trophic levels, whereas the dietary assimilation efficiency (AE) was 28.5-57.6% in the copepods and 36.6-70.2% in the fish. The dietary AE was highly dependent on the food concentrations and food type. The elimination rate constant of dioxin in the copepods varied with different exposure pathways as well as food concentration and food type. Biokinetic calculation showed that dietary accumulation was the predominant pathway for dioxin accumulation in marine copepods and fish. Aqueous uptake can be an important pathway only when the bioconcentration of dioxins in the phytoplankton was low. (C) 2011 Elsevier Ltd. All rights reserved.
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