STP891

    Bioconcentration of Four Chlorinated Dioxins By Rainbow Trout and Fathead Minnows

    Published: Jan 1985


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    Abstract

    Accumulation of four 14C-labelled chlorinated dibenzo-p-dioxins (1,2,3,7-tetrachloro- (T4CDD), 1,2,3,4,7-pentachloro- (P5CDD), 1,2,3,4,7,8-hexachoro- (H6CDD), and 1,2,3,4,6,7,8-heptachloro- (H7CDD) isomers) from water by rainbow trout fry (Salmo gairdneri) and fathead minnows (Pimephales promelas) was studied using a 5-day exposure period followed by a 24-day elimination phase. Water concentrations of these hydrophobic compounds (measured after centrifugation) ranged from 0.005 to 0.10 ng/mL during the fish exposures. Equilibrium bioconcentration factors calculated by use of a two-compartment kinetic rate model ranged from 810 for P5CDD to 2278 for H6CDD in rainbow trout and from 515 for H7CDD to 4232 for H6CDD in fathead minnows. Elimination rates of T4CDD and P5CDD isomers were similar and rapid, with half-lives of total radioactivity averaging about 2.6 days in trout fry and 3.0 days in minnows. Half-lives of total 14C for H6CDD and H7CDD were also similar but much longer than the other two isomers averaging about 16 days in rainbows and 20 days in fatheads. Low bioconcentration by both species was attributed to the high proportion of total radioactivity in water apparently unavailable to the fish because of association with suspended and dissolved material and to poor membrane transport.

    Keywords:

    bioconcentration, polychlorinated dioxins, uptake rate constant, elimination rate constant, rainbow trout, fathead minnows, tetrachlorodibenzodioxin, pentachlorodibenzodioxin, hexachlorodibenzodioxin, heptachlorodibenzodioxin


    Author Information:

    Muir, DCG
    Research scientist and chemical technologist, Freshwater Institute, Winnipeg, Canada

    Yarechewski, AL
    Research scientist and chemical technologist, Freshwater Institute, Winnipeg, Canada

    Webster, GRB
    Professor, University of Manitoba, Winnipeg,


    Paper ID: STP33593S

    Committee/Subcommittee: E47.01

    DOI: 10.1520/STP33593S


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