In most cases in environmental toxicology where the concentration of the
xenobiotic in the air, water, food, etc is low, absorption takes place by passive
diffusion, and therefore, at a rate proportional to the concentration gradient
between the site of absorption and the blood. In these cases, the rate of
absorption is described by exponential or first-order kinetics.
In most cases in environmental toxicology where the concentration of thexenobiotic in the air, water, food, etc is low, absorption takes place by passivediffusion, and therefore, at a rate proportional to the concentration gradientbetween the site of absorption and the blood. In these cases, the rate ofabsorption is described by exponential or first-order kinetics.
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