Theoretical Modeling and Reactivity of the Iron Chelates in Agronomic Conditions

摘要

O,oEDDHA/Fe~(3+) and its analogues (o,oEDDHMA/Fe~(3+), EDDHSA/Fe~(3+)) are chosen as the main iron chelates used to correct iron chlorosis in crops grown in calcareous and alkaline soils. In order to test new chelating agents, prior to their application, theoretical modeling using the speciation program MINTEQA2 is proposed. Also interaction tests between the chelates and the main soil components (organic matter, metal oxide/hydroxide, clay, carbonate ...) are a useful tool to study the sorption processes on the soil surfaces. In addition, percolation column tests provide information on the mobility of these chelates depending on the soil type.