Adsorption, Oxidation and Complexation of Water-So-Inble Organic Snbstances in SoilsEnglish Full Text
DING CHANG-PUInstitute of Sozl Sczence, Academza Sznica, P. O. Boz 82i, Nalzjzng 210008 (China) )
Abstract: A greater part of water-solnble organic substances, accounting for 6070To of the total, could be adsorbedby soils, which included strongly and weekly reducing substances, positively and negatively charged substancesand substances containing amido. There existed a tendency of decrease in adsorption of the negativelycharged organic substances by the soil from South China to North China, with expression as Coulombianadsorption. A simultaneous reduction of iron and manganese appeared with clear voltammetric behavioursupon oxidation of water-soluble organic substances. Complexation of organic ligands with ferrons iron andmanganous manganese was proved by differential pulse voltammetric method, with disappearance of oxidationpeaks of ferrous iron and manganous manganese at 0.00 V and 0.35 V and occurrence of Fe`+-complex andMn￣2+ -complex at 0.75 V and 1.2 V respectively, whose peak potentials shifted backward.
Keywords：
adsorption; complexation; oxidation; voltammetric behaviour; water-solube organic substances;
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S154.1
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