The theoretical-profile-shape (TPS) method for estimating pesticide evaporative flux from soil was compared to the aerodynamic-profile (AD) method in an intraplot field experiment using dacthal (DCPA) herbicide. Flux values measured by the TPS method were approximately 20% higher than values found by the AD method. Linear regression analysis of soil concentration over an 84-d period showed a soil half-life of 33.8 d. Of the amount lost from soil, 52 and 36% were accounted for by volatilization with the TPS and AD methods, respectively. The volatilization half-life of dacthal based on the 21-d cumulative flux measurements from actual and estimated daily fluxes were 59 and 83 d for the TPS and AD methods, respectively. The results were compared to the 138-d prediction of a published environmental fate model.
No takes yet. Share an insight, caveat, or question.
Majewski et al. (1991) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: