Pedosphere 5(2): 171--178, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Adsorption, oxidation and complexion of water-soluble organic substances in soils |
| DING Chang-Pu |
| Institute of Sozl Sczence, Academza Sznica, P. O. Boz 821, Nanjing 210008 (China) |
| ABSTRACT |
| A greater part of water-soluble organic substances, accounting for 60-70% of the total, could be adsorbed by soils, which included strongly and weekly reducing substances, positively and negatively charged substances and substances containing amido. There existed a tendency of decrease in adsorption of the negatively charged organic substances by the soil from South China to North China, with expression as Coulombian adsorption. A simultaneous reduction of iron and manganese appeared with clear voltammetric behaviours upon oxidation of water-soluble organic substances. Complexation of organic ligands with ferrous iron and manganous manganese was proved by differential pulse voltammetric method, with disappearance of oxidation peaks of ferrous iron and manganous manganese at 0.00 V and 0.35 V and occurrence of Fe2+-complex and Mn2+-complex at 0.75 V and 1.2 V respectively, whose peak potentials shifted backward. |
| Key Words: adsorption, complexation, oxidation, voltammetric behaviour, water-solube organic substances |
| Citation: Ding, C. P. 1995. Adsorption, oxidation and complexion of water-soluble organic substances in soils. Pedosphere. 5(2): 171-178. |
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