has little effect on the concentration at time t, Ct. The rate of absorption will be
independent of Ct until the concentration decreases to a much lower value.
Under these conditions, the rate of absorption is constant and follows zeroorder
kinetics. Figure 6 compares the rate of absorption of a xenobiotic
under two conditions of zero-order and first-order kinetics, plotting the data as
a linear function of the plasma concentration of the xenobiotic. Figure 7 takes
the same data and plots the plasma concentration as a log function.