![]() ![]() In contrast, the DT50 is the time required for the concentration to decline to half of the initial value. It is an intuitive way to express the rate of decline of a first-order degradation. The half-life, t 1/2 =ln(2)/ k, indicates the time required to reduce the concentration by 50% from any concentration point in time. The first-order representation is convenient because the rate is summarized with a single parameter (the rate constant, k), and the rate of transformation is independent of the initial concentration. The rate of transformation of pesticides in the environment is commonly described using first-order kinetics, often referred to as single first-order (SFO).
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