Method for Accurately Determining Vanadium Content in Vanadium Chromium Hydrogen Storage Alloy
A hydrogen storage alloy, vanadium-chromium technology, applied in the field of analytical chemistry, can solve the problems of inaccurate measurement results, unsatisfactory effect of masking chromium, etc., and achieves the effect of less reagent consumption, reduction of reagent types and dosage, and good accuracy.
Active Publication Date: 2021-03-16
PANZHIHUA UNIV
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[0006] The technical problem to be solved by the present invention is: when measuring the vanadium content in high-chromium alloys in the prior art, alcohol is used as a masking agent, and the effect of masking chromium due to the influence of excessive sodium nitrite is not ideal, making the measurement results inaccurate and other problems
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[0026] The invention provides a method for accurately measuring the vanadium content in a vanadium-chromium hydrogen storage alloy, comprising the following steps:
[0027] a. Take a vanadium-chromium hydrogen storage alloy sample, add sulfuric acid and nitric acid, and dissolve the sample;
[0028] B, add ammonium ferrous sulfate in the solution gained in step a, vanadium, chromium are reduced to low price;
[0029] c, adding potassium permanganate solution to the solution obtained in step b, the vanadium is oxidized to +5 valence;
[0030] d, add urea to the solution obtained in step c, then add excess sodium nitrite;
[0031] E, add N-phenyl anthranilic acid indicator in step d gained solution, titrate with ammonium ferrous sulfate standard solution, titration ends when solution turns bright green by wine red, and the ammonium ferrous sulfate consumed is recorded as Vml, the formula for calculating the percentage content of vanadium: Wherein, V% is the percentage conten...
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The invention belongs to the technical field of analytical chemistry, and particularly relates to a method for accurately measuring vanadium content in a vanadium chromium hydrogen storage alloy to solve the problem in the prior art that when the vanadium content in a high-chromium alloy is measured, alcohol is used as a masking agent, the chromium masking effect is not satisfactory with the influence of excess sodium nitrite, and therefore the measuring result is not accurate. The method for accurately measuring the vanadium content in the vanadium chromium hydrogen storage alloy comprises the following steps that a, a sample of the vanadium chromium hydrogen storage alloy is taken, and sulfuric acid and nitric acid are added to dissolve the sample; b, ammonium ferrous sulfate is added toreduce vanadium and chromium to low valence; c, a potassium permanganate solution is added to oxidize the vanadium to +5 valence; d, urea is added, and excessive sodium nitrite is added; and e, indicator is added, titration is conducted with a standard solution of ammonium ferrous sulfate to calculate the percentage composition of the vanadium. The chromium is masked by adding excessive sodium nitrite. Masking can be achieved without the alcohol. The measuring result is accurate and reliable, operation is simple and popularization can be facilitated.
Description
technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for accurately measuring the vanadium content in a vanadium-chromium hydrogen storage alloy. Background technique [0002] Vanadium-chromium hydrogen storage alloy is a new type of alloy, which can absorb hydrogen under certain conditions and release hydrogen under certain conditions. It has excellent cycle life performance and can be used in large batteries, especially electric vehicles, hybrid electric vehicles, high-power applications, etc. . The main components of the vanadium-chromium hydrogen storage alloy are vanadium and chromium, wherein the content of vanadium in the alloy is about 45-65%, and the content of chromium in the alloy is about 10-25%. When determining the vanadium content in the alloy, due to the high chromium content, it is easy to interfere with the determination of vanadium, making the determination results inaccurate. ...
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IPC IPC(8): G01N21/79
CPCG01N21/79
Inventor 冯向琴
Owner PANZHIHUA UNIV