Organic Matter and Heavy Metals Sorption

Organic matter content in soils is highly variable and includes dead living organisms their decomposition products. plant residue humic substances. Thermodynamically, organic unstable later will oxidize to Co2, H2O. The effective substances of are fulvic acids (FA+Hu) which contain Several functional groups that release electrons or protons during leaving behind several radical act as electron donner ward heavy metal ions forming FA Hu-metal soluble insoluble complexes. Those metallic-organic Complexes by Stability constant (SC) absolutely pH-dependent. less stable the complex, higher mobility soil, In contrast, a complex mobility. So, plays an important role accumulation, leaching, transportation Cations present water chelates different supplying roots these behavior buffering substance