Quantitative structure-activity relationships for predicting potential ecological hazard of organic chemicals for use in regulatory risk assessments.
The use of quantitative structure-activity relationships (QSARs) for deriving the predicted no-effect concentration of discrete organic chemicals for the purposes of conducting a regulatory risk assessment in Europe and the United States is described. In the United States, under the Toxic Substances Control Act (TSCA), the TSCA Interagency Testing Committee and the U.S. Environmental Protection Agency (U.S. EPA) use SARs to estimate the hazards of existing and new chemicals. Within the Existing Substances Regulation in Europe, QSARs may be used for data evaluation, test strategy indications, and the identification and filling of data gaps. To illustrate where and when QSARs may be useful and when their use is more problematic, an example, methyl tertiary-butyl ether (MTBE), is given and the predicted and experimental data are compared. Improvements needed for new QSARs and tools for developing and using QSARs are discussed.
Comber
Mike H I
MH
Exxon Mobil Biomedical Sciences, Exxon Mobil, Hermeslaan 2, 1831 Machelen, Belgium. mike.comber@exxonmobil.com
Walker
John D
JD
Watts
Chris
C
Hermens
Joop
J
D000818:Animals; D023381:Endpoint Determination; D004777:Environment; D004785:Environmental Pollutants / Q000633:toxicity*; D005060:Europe; D005544:Forecasting; D006801:Humans; D019055:No-Observed-Adverse-Effect Level; D009930:Organic Chemicals / Q000633:toxicity*; D021281:Quantitative Structure-Activity Relationship; D018570:Risk Assessment; D014481:United States
D004785:Environmental Pollutants; D009930:Organic Chemicals