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Study　on　Water－Soluble　organic　reducing　substances：Ⅲ．Electrochemical　Properties　of　Decomposition　Products　of　Rice　Straw　and　Their　Interactions　with　Variable　Charge　Soils

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Pedosphere 1996年第2期6卷 167-173页

作者： WU YOUXIAN(Institute of Soil Science,Acodemia Sinica,P.O.Box 821,Nanjing 210008 China) Institute of Soil Science Academia Sinica P. O. Box 821 Nanjing 210008 China

Some electrochemical properties,such as PH,Eh,and voltammetric behavior,of the decomposition products of rice straw and the in eractions of these products with soils were *** PH,Eh,and amounts of organic reducing substances changed markedly during the 60-day anaerobic *** decreased sharply to pH 5 on the tenth day and then increased gradually to 7 on the 45th *** amouats of organic reducing substances increased almost synchronously with the fall of redox potential during the first 15 *** differential pulse voltammetric(dpv) behavior changed not only in the peak current but also in the peak *** fractions with apparent molecular weights lower than 200 dations appeared to be active in dpv *** electric charge of organic reducing substances was closely related to the decomposition *** 6th day of incubation was the crucial time before and after which the major part of the components was negatively charged and positively charged, *** group with a low apparent molecular weight and a negative charge was the main components responsible for the lower anodic peak *** were oxidized first during the interactions of the organic reducing substances with soils.

关键词： electrochemical properties organic reducing substances rice straw variable charge soils

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Study on Water-Soluble organic reducing substances: II. organic reducing substances Produced from Anaerobic Decomposition of Milk Vetch (Astragalus sinicus L.)

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Pedosphere 1992年第4期2卷 355-362页

作者： WUYOU－XIAN DINGCHANG－PU InstituteofSoilScience AcademiaSinicaP.O.Box821Nanjing210008（China） InstituteofSoilScience Academia

The characteristics of electric charge and molecular weight distribution,oxidation-reduction regimes,*** and amounts of organic reducing substances produced by milk vetch during anaerobic decomposition process,were studied by using electrochemical *** between soils and organic reducing substances was also *** results indicate that the organic reducing substances were mainly the organic compounds with negative and amphoteric charges,which were distributed in two groups at anodic peak potentials of 0.25 and 0.69 volt in differential pulse voltammograms,*** apparent molecular weights are all less than 700 daltons,in which those active in oxidation-reducion reaction were distributed in the fraction with apparent molecular weight less than 200 *** organic reduction substances can be oxidized by manganese oxides in their interaction with soils.

关键词： electric charge milk vetch molecular weight organic reducing substances oxidation-reduction regime

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维普期刊数据库

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Study on Water-Soluble organic reducing substances. I. Determination of organic reducing substances by Differential Pulse Voltammetry

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Pedosphere 1991年第2期1卷 157-167页

作者： WUYOU－XIAN DINGCHANG－PU InstituteofSoilScience AcademiaSinica.P.O.Box821Nanjing210008（China） InstituteofSoilScience Academia

A new method was proposed for study of organic reducing substances in soils. According to the theoretical relationship between the voltammetric behaviors and reduction-oxidation reaction of reducing substances, the working conditions of differential pulse voltammetry (d.p. v.) for determining the organic reducing substances produced during the processes of the anaerobic decomposition of plant materials were established with a glass carbon electrode as working electrode, 1 M Ag-AgCl electrode with large area as reference electrode, 0.2 M NH4AC as supporting electrolyte and pH buffer solution, pulse amplitude (AE) of 25 mV, scan rate at 2 mV·S-1and scan potential ranging from -0.5 to +1.2 voltage(vs. M Ag-AgCl). The peak current proportional to the concentration of reducing substances, and the characteristic peak potential of each organic reducing substance were regarded as the quantitative and qualitative base, respectively. These results obtained under the conditions mentioned above directly reflect both the reducing intensity and capacity of the organic reducing system in soils.

关键词： differential pulse voltammetry organic reducing substances peak current peak potential

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