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Wu, W.Z.* ; Zhang, Q.H.* ; Schramm, K.-W. ; Xu, Y.* ; Kettrup, A.

Distribution, transformation and long-term accumulation of polychlorinated dibenzo-p-dioxins and dibenzofurans in different tissues of fish and piscivorous birds.

Ecotoxicol. Environ. Saf. 46, 252-257 (2000)

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The present study monitored 10-year-old fish and piscivorous birds from sites contaminated for many years. The data reflected the results of actual, long-term environmental exposures. The results demonstrate that different tissues of fish have quite different concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F). The concentration order of PCDD/F within fish is liver≅egg≅intestine>kidney≅heart>gill≅bladder>muscle>brain. The concentration order of PCDD/F within piscivorous birds was liver>egg≅heart>muscle≅stomach>brain. The results obtained also demonstrate that the accumulation patterns of piscivorous birds and fish are quite different. The tissues of fish and piscivorous birds have different capacities for bioaccumulation and biotransformation of PCDD/F; variable proportions of TEQs were also found throughout their bodies. In fish, toxic equivalency quotient (TEQ): PCDD/F ratios in various tissues ranged from 0.01 to 0.07, whereas in birds the ratios ranged from 0.07 to 0.43. If the concentrations are normalized with lipid content, the results vary less. The effect of different lipid properties is obvious in the case of brain tissue, which is richer in phospholipids.

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