surrogate toxicant

https://doi.org/10.1351/goldbook.15080
Relatively well-studied substance whose properties are assumed to apply to an entire chemically and toxicologically related class.
Example: Benzo[a]pyrene data may be used as toxicologically equivalent to that for all carcinogenic polynuclear aromatic hydrocarbons.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 952 [Terms] [Paper]