The pesticide soil literature is so voluminous that there are even too many reviews to be searched or cited. The only practical option now for environmental practioners and current research groups is to selectively consult the literature, and to avoid adding more examples of what has already been reported. Agricultural soils are the ultimate example of physically and chemically irregular mixtures. That resulted in a 50 year accumulation of empirical parameters used as approximations. A careful selection of publications has yielded two critical reviews and a series of discoveries reported by several authors. This is making pesticide soil science more chemically correct and predictive. A 2001 review by A. D. Sitea concluded that the empirical parameters had serious limitations. IUPAC Project No. 640/43/97 followed a year later, in which S. Yeh et al. independently came to the same conclusions as Sitea. To correct the problems identified by these reviewers, the series of discoveries has now been used to replace the empirical parameters with conventional chemical kinetics based on real chemical stoichiometry. The predictive spreadsheet models that have been tested for particular pesticide soil combinations now need to be generalized. The search is on for the factors that control sorption sites and kinetic rate coefficients. Soil components and pesticide chemical structures are suspected.

Stoichiometry and conventional kinetics for pesticide soil reaction mechanisms: What causes sorption sites and rate coefficients?

248th National Meeting (2014)

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