DETERMINATION OF SOME REDOX PROPERTIES OF HUMIC-ACID BY ALKALINE FERRICYANIDE TITRATION

被引：66

作者：

HELBURN, RS ^{[1
]}

MACCARTHY, P ^{[1
]}

机构：

[1] COLORADO SCH MINES,DEPT CHEM & GEOCHEM,GOLDEN,CO 80401

来源：

ANALYTICA CHIMICA ACTA | 1994年 / 295卷 / 03期

关键词：

POTENTIOMETRY; TITRIMETRY; HUMIC SUBSTANCES;

D O I：

10.1016/0003-2670(94)80231-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A method for the direct potentiometric oxidation titration of aqueous phase humic substances with potassium ferricyanide (K,Fe(CN),) has been developed. Oxidative titrations of humic acid were carried out at varying analyte concentrations, and at values of pH ranging from 5.0 to 11.0. Model synthetic mixtures of phenols and hydroquinones were examined in the same pH range. Ferricyanide titrations of humic acid at pH 9.0 yielded single discrete endpoints, and generally stable potential measurements in the pre-equivalence point region of the titration curve. Cyclic voltammetry of alkaline solutions of humic acid provides evidence for direct interaction between phenolic components in the humic acid and the electrode surface, and that for titrations conducted at pH 9.0 and above, humic acid can contribute to the poising of the potential measurements in the region of the half-titration point.

引用

页码：263 / 272

页数：10

共 49 条

[21] APPLICATION OF THERMOMETRIC TITRATIONS TO STUDY OF SOIL ORGANIC-MATTER .2. HUMIC ACIDS [J].

KHALAF, KY ;

MACCARTHY, P ;

GILBERT, TW .

GEODERMA, 1975, 14 (04) :331-340

[22] Mixed potentials at the dropping mercury electrode [J].

Kolthoff, IM ;

Miller, CS .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1940, 62 :2171-2174

[23] ROTATED AND STATIONARY PLATINUM WIRE ELECTRODES - RESIDUAL CURRENT-VOLTAGE CURVES AND DISSOLUTION PATTERNS IN SUPPORTING ELECTROLYTES [J].

KOLTHOFF, IM ;

TANAKA, N .

ANALYTICAL CHEMISTRY, 1954, 26 (04) :632-636

[24] STANDARD SOLUTION FOR REDOX POTENTIAL MEASUREMENTS [J].

LIGHT, TS .

ANALYTICAL CHEMISTRY, 1972, 44 (06) :1038-&

[25] POLAROGRAPHY AND COULOMETRY IN DIMETHYLSULFOXIDE OF NITRIC ACID OXIDATION PRODUCTS FROM SOIL HUMIC ACID [J].

LINDBECK, MR ;

YOUNG, JL .

SOIL SCIENCE, 1966, 101 (05) :366-&

[26] DIRECT MEASUREMENT OF INFRARED-SPECTRA OF HUMIC SUBSTANCES IN WATER BY FOURIER-TRANSFORM INFRARED SPECTROSCOPY [J].

MACCARTHY, P ;

MARK, HB ;

GRIFFITHS, PR .

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 1975, 23 (03) :600-602

[27]

MACCARTHY P, 1975, THESIS U CINNCINATI

[28] LIMITATIONS IN THE USE OF COMMERCIAL HUMIC ACIDS IN WATER AND SOIL RESEARCH [J].

MALCOLM, RL ;

MACCARTHY, P .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1986, 20 (09) :904-911

[29]

Martell A.E., 1974, CRITICAL STABILITY C

[30] MECHANISM OF PHENOLIC OXIDATIVE COUPLING REACTIONS - FERRICYANIDE OXIDATION OF 2,3',4-TRIHYDROXYBENZOPHENONE, AN EXAMPLE OF A RADICAL AROMATIC SUBSTITUTION MECHANISM [J].

MCDONALD, PD ;

HAMILTON, GA .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1973, 95 (23) :7752-7758

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