Concentrations and Biota-Sediment Accumulations of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Fish and Shrimp from Lake Kasumigaura.
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PCDDs/PCDFs with four or more chlorine atoms, including non 2, 3, 7, 8-substituted isomers in fish and shrimp from Lake Kasumigaura were analyzed and their isomer profiles and biota-sediment accumulation factors were investigated. The concentration of total PCDDs/PCDFs and I-TEQ in fish and shrimp were 4.19-247.09pg/g (wet weight) and 0.18-9.85pg TEQ/g, respectively. The concentration of 1, 3, 6, 8 and 1, 3, 7, 9-TCDD were high in all samples and these two isomers accounted for more than 90% of the total TCDDs. The proportion of 2, 3, 7, 8-substituted isomers was 12.7-49.5% of the total PCDDs/PCDFs con-centration. 2, 3, 7, 8-Substituted isomers accumulated selectively in fish. The biota-sediment ac cumulation factors of PCDDs/PCDFs decreased with increasing log K<SUB>ow</SUB>. Cluster analysis showed that the accumulation patterns from sediment to biota differed between crustaceans and fish.
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