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AMPEROMETRIC TITRATION OF CHROMIUM IN MIXTURES OF FLUORIDE SALTS

Journal Article · · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.
DOI:https://doi.org/10.1021/ac60212a011· OSTI ID:4015712
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A rapid and precise method for the amperometric titratlon of chromium in mixtures of fluoride salts was developed. The salt is dissolved in a mineral acid mixture, after which the chromium is oxidized to Cr(VI) with argentic oxide. The Cr(VI) is then amperometrically titrated with ferrous sulfate. This reduction causes no change in cell current urtil the end point is reached where the current decreases. The titration is followed by means of a polarograph equipped with a titration cell that consists of a pyrolytic graphite electrode vs the S.C.E. The optimum potential for the titration is + 1.0 volt vs the S.C.E. In the range of 1 to 50 mu g of Cr(VI) titrated, the relative standard deviation is less than 2%. Of the interferences studied, only Mn(VII) and Ce(IV) interfere with the method at the level of concentrations studied. (auth)
Research Organization:
Oak Ridge National Lab., Tenn.
NSA Number:
NSA-18-019869
OSTI ID:
4015712
Journal Information:
Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Journal Name: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed. Vol. Vol: 36; ISSN ANCHA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

AMPEROMETRY
CHEMISTRY
CHROMIUM
ELECTRIC POTENTIAL
ELECTRODES
ERRORS
FLUORIDES
GRAPHITE
INTERFERING ELEMENTS
IRON SULFATES
MINERAL ACIDS
MIXING
OXIDATION
POLAROGRAPHY
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
SILVER OXIDES
SOLUTIONS
TITRATION