Changes in the sorption of manganese and iron ions under the effect of differentiated oxygenation and reaction of the soil

The study is concerned with the course of sorption of Fe²⁺, Fe³⁺ and Mn²⁺ ions and with their washing, out with distilled water in sandy, loess, and loamy soils. Sorption was conducted according to the idynamic method. ODR and Eh were measured as indices of soil oxygenation. It was found that oxygen deficiency of the soils under study, with a change in their reaction from acid to neutral, resulted in: 1. an increase in the sorption of Fe²⁺ and Fe³⁺ ions, 2. an increase in the sorption of Mn²⁺ ions in the loamy soil only.