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Relationships between aqueous oxygen concentration and uptake and elimination rates during bioconcentration of hydrophobic chemicals in fish
Author(s) -
Opperhuizen Antoon,
Schrap S. Marca
Publication year - 1987
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620060503
Subject(s) - bioconcentration , chemistry , aqueous solution , oxygen , gill , environmental chemistry , poecilia , fish <actinopterygii> , pollutant , limiting oxygen concentration , bioaccumulation , biology , organic chemistry , fishery
Oxygen concentrations in ambient water do not influence the uptake and elimination rates of 2,2′,5,5′‐tetra‐ and 2,2′,4,4′,5,5′‐hexachlorobiphenyl in guppies ( Poecilia reticulata ) after aqueous exposure. It is concluded that both the bioconcentration kinetics and bioconcentration factors are independent of the ambient oxygen regime between 2.5 and 8.0 mg/L. Since it can be assumed that the volume of water passing over the gills increases proportionally with decreasing aqueous oxygen concentration, it is concluded that for the bioconcentration of extremely hydrophobic chemicals, such as polychlorinated biphenyls, the uptake efficiencies rather than the uptake rate constants are dependent on the aqueous oxygen concentration. The experimental results support the concept that the rate of diffusion of the hydrophobic chemicals inside the fish, and not the ventilation volume of contaminated water passing over the gills, dominates the rates of uptake and elimination.