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By Wenlin Chen; Aleksandar Sabljic; Steven A Cryer; Rai S Kookana; American Chemical Society. Division of Agricultural and Food Chemistry

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By Wenlin Chen; Aleksandar Sabljic; Steven A Cryer; Rai S Kookana; American Chemical Society. Division of Agricultural and Food Chemistry

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Extra resources for Non-first order degradation and time-dependent sorption of organic chemicals in soil

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Their regressions were developed on a compound/study-specific basis so that the inherent biodegradability factor did not need to be accounted for separately. Assuming biodegradability is directly proportional to microbial population, Struijs and Van Den Berg (30) showed that specific biotransformation rates in different environmental media could be estimated from a compound’s biodegradability adjusted by a bioavailability factor of the underlying medium. The authors emphasized that standardized biodegradability measurements are necessary for inter-media extrapolation in the assessment of environmental biodegradation rates.

5%). Recall that in the Shelton and Parkin study (21), significant decrease in carbofuran degradation rate was observed only when soil moisture decreased to below 15%. Figure 11. 5% soil moisture content (15 bar) and 20 °C. 4%). Data source: Krieger et al. study (22). Relation to Double First-Order in Parallel. It is interesting to observe that the analytical solutions for the concentration in soil water (Eq. 5) and the total bulk soil system (Eq. 8) are both double exponential decay, a decline pattern well observed in many soil metabolism and field dissipation studies (28, 29).

58-fold smaller. No degradation is assumed at or below 0°C. Figure 3. 7 (9, 13). θFC is the gravimetric soil moisture at field capacity (pF 2). Degradation at 37% field capacity is only half as fast compared to 100% field capacity. The degradation rate does not increase beyond field capacity. ; Kinetic Evaluations The kinetic evaluation of degradation data after normalization usually follows the guidance provided in (10) to derive modeling endpoints that can be used as input in numerical leaching models.

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