- Concentration, amount or intensity of a particular physical or
chemical agent or environmental agent that reaches the target
population, organism, organ, tissue, or cell, usually expressed in
numerical terms of concentration, duration, and frequency (for
chemical agents and micro-organisms) or intensity (for physical
- Process by which a substance becomes available for absorption by
the target population, organism, organ, tissue or cell, by any route.
PAC, 2004, 76, 1033
(Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003))
on page 1051
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook