Estimating biotransformation rate constants of organic chemicals from modeled and measured elimination rates.
In this study, biotransformation rate constants are estimated for a large set of organic compounds. Biotransformation (km) is considered part of the total elimination, further consisting of physico-chemical elimination to water (kw), depuration by feces (kf) and growth dilution (gamma). Existing models are used to estimate kw and kf, and gamma. The difference between measured elimination rate constants and the sum of predicted elimination rate constants for water, feces and growth indicates the ration of biotransformation in the total elimination. In all examined animal classes, polycyclic aromatic hydrocarbons seem to be metabolized at an intermediate rate. Because of the relative low hydrophobicity of some of the studied compounds, their physico-chemical elimination rate constant is relatively high, and the relative contribution of metabolism to total elimination of these compounds is therefore relatively low. Fish seem to be capable of metabolizing chlorodibenzo-p-dioxins and -furans, DDT, chloroanilines and phenol.
van der Linde
A
A
Department of Chemistry and Ecotoxicology, Institute for Inland Water Management and Waste Water Treatment, Lelystad, The Netherlands.
Hendriks
A J
AJ
Sijm
D T
DT
D000818:Animals; D001711:Biotransformation; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004785:Environmental Pollutants / Q000378:metabolism*; D005399:Fishes; D008962:Models, Theoretical; D011084:Polycyclic Aromatic Hydrocarbons / Q000378:metabolism*; D012016:Reference Values; D014867:Water
D004785:Environmental Pollutants; D011084:Polycyclic Aromatic Hydrocarbons; D014867:Water