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Zeng F.-W.,Dalian Bolong New Materials Co. | Song M.-M.,Dalian Bolong New Materials Co. | Chen Y.-B.,Dalian Bolong New Materials Co. | Sun T.-J.,Dalian Galaxy Metal Materials Co. | And 4 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2013

The redox titration was the common method for the determination of vanadium, in which, N-phenyl-o-aminobenzoic acid was used as indicator, and the content of vanadium was titrated using ammonium ferrous sulfate (FAS) standard solution. In national standard and industrial standard, ferrous was calibrated mainly with reference materials or standard solutions such as spectroscopically pure vanadium pentoxide, ammonium meta-vanadate, potassium dichromate and potassium permanganate. Based on the difference study of FAS calibration, its influence on the determination of vanadium was investigated. It was found that, when ammonium meta-vanadate or vanadium pentoxide was used as reference material, the calibration of solution and the determination of vanadium content in vanadium compounds had the same chemical reaction. The error caused by the color change potential of indicator and the difference of stoichiometric potential would be partially offset and decreased. Compared with ammonium meta-vanadate (or vanadium pentoxide), the calibration results of FAS were lower when potassium permanganate and potassium dichromate were used, so the determination results of vanadium were also lower. Source

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