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practical applications of biological control: the moment of sampling

To select the time of sampling should take into account the different aspects of the chemical kinetics, in particular, must know its absorption by the lungs, gastrointestinal tract and skin, its distribution after various compartments of the body, biotransformation, and finally disposal. It is also important to know which parts of the body can accumulate.
On exposure to organic substances, the time of collection of biological samples is the most important, given the different rates of metabolic processes involved and, consequently, more or less rapid excretion of absorbed dose.