ELECTRON EXCHANGE BEHAVIORS OF HUMIC SUBSTANCES WITH IRON, COPPER, AND MANGANESE

Publisher Website
Google Scholar
Abstract
Iron, copper, and manganese are the three major micronutrient cations with variable valencies present in soils. Both microorganisms and soil organic matter are known to cause the transformation of their oxidation states. Although it is more or less certain that the nonhumic part of the soil organic matter can cause such electron exchanges, the role of humic substances in this process is not definitely known. For this reason, interaction of the metal ions with humic substances under sterile conditions and in the absence of nonhumic substances has been studied. Both sterile humic substances and. their nonsterile counterparts were characterized and compared. It is concluded that apart from the simultaneous formation of well-known chelates, humic substances are independently able to change the valence state of metal ions. Iron, copper, and manganese are the three major micronutrient cations with variable valencies present in soils. Both microorganisms and soil organic matter are known to cause the transformation of their oxidation states. Although it is more or less certain that the nonhumic part of the soil organic matter can cause such electron exchanges, the role of humic substances in this process is not definitely known. For this reason, interaction of the metal ions with humic substances under sterile conditions and in the absence of nonhumic substances has been studied. Both sterile humic substances and. their nonsterile counterparts were characterized and compared. It is concluded that apart from the simultaneous formation of well-known chelates, humic substances are independently able to change the valence state of metal ions. © Williams & Wilkins 1983. All Rights Reserved.

This publication has 1 reference indexed in Scilit: