The steady-state concentration, ecotoxicology

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The steady-state concentration, ecotoxicology

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How can we calculate the steady-state concentration of a compound in an animal is 230 mmol/l in a contaminated environment. The animal is then moved to a clean environment. The rate constant for excretion of the compound is 0.16 min-1. What is the concentration of the compound in the animal after 20 min and after 2 h?

In this we suppose that there is only one compartment in the animal, i.e. elimination if we  follows the formula Ct=Coe^-kt; in our answer can we also evaluate, when multiple compartments with different fluxes may occur.