compartmental analysis

https://doi.org/10.1351/goldbook.CT06818
Mathematical process leading to a model of transport of a substance in terms of compartments and rate constants, usually taking the form $C=A\ \text{e}^{-\alpha\ t}+B\ \text{e}^{-\beta \ t}\text{...}$ where each exponential term represents one experiment. C is the substance concentration; A, B,… are proportionality constants; α, β,… are rate constants; and t is time.
Source:
PAC, 2004, 76, 1033. 'Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)' on page 1045 (https://doi.org/10.1351/pac200476051033)