Constant-half-life first-order degradation

 Degradation in soils is the result of a combination of chemical and, predominantly, biological events (Bollag and Liu, 1990; Wu and Nofziger, 1999). A first-order degradation model is used to simulate the variation of residual mass of a chemical compound in a soil syetm after its application (Dykaar and Kitanidis, 1996; Walker, 1974). If the first-order rate constant or half-life remains unchanged in the degradation process, the residual mass of the chemical degraded decreases exponentially with time. This program displays the changing concentration of a chemical undergoing first-order degradation for user specified degradation rates and initial concentrations.

Send email to david.nofziger@okstate.edu

Last Modified: January 16, 2008.