Analysis method of chromium in chromium vanadium hydrogen storage alloy

Abstract

The invention relates to an analysis method of chromium in a chromium vanadium hydrogen storage alloy, and belongs to the field of analytical chemistry. The invention solves the technical problem by providing a simple rapid accurate and direct analysis method for determining chromium content in the chromium vanadium hydrogen storage alloy. The method includes the steps of: A, dissolution of sample: dissolving a vanadium chromium hydrogen storage alloy sample with sulfuric acid and nitric acid, and adding water to a constant volume to obtain a sample solution; B, oxidation: adding ammonium peroxydisulfate into the sample solution under certain acidity, oxidizing vanadium and chromium under the catalysis of silver nitrate; C, vanadium color masking; D, spectrophotometric determination and calculation of chromium content: determining the absorbance of chromium by a spectrophotometric method, and calculating the chromium content according to the absorbance. The method does not require a color developing agent in the spectrophotometric determination, uses the natural color of chrome, and masks the color of vanadium by adjusting the pH value, so as to eliminate the interference of vanadium on the determination of chromium; and the spectrophotometric method can directly measure the content of chromium in the chromium vanadium hydrogen storage alloy.

Description

technical field [0001] The invention relates to a method for analyzing chromium content. Especially for the analysis method of chromium in vanadium chromium hydrogen storage alloy with high content of vanadium and chromium, it belongs to the field of analytical chemistry. Background technique [0002] At present, some universities and scientific research institutes are developing a new material - vanadium chromium hydrogen storage alloy. %between. The method for directly measuring the chromium content in this sample has not been reported yet. [0003] According to existing literature reports and actual production experience, the analysis of high-content chromium generally adopts ferrous ammonium sulfate titration method. During the determination process of this method, vanadium interferes very much with the determination. Since the properties of vanadium and chromium are very similar, it is difficult to Vanadium and chromium are separated. At present, this method is ofte...

AI Technical Summary

Problems solved by technology

[0003] According to existing literature reports and actual production experience, the analysis of high-content chromium generally adopts ferrous ammonium sulfate titration method. During the determination process of this method, vanadium interferes very much with the determination. Since the properties of vanadium and chromium are very similar, it is difficult to Separation of vanadium and chromium

At present, this method is often used to measure the total amount of vanadium and chromium, and then subtract the amount of vanadium to convert the content of chromium. There are problems in this operation: (1) the workload is large, time-consuming and labor-intensive: originally only chromium is needed However, the amount of vanadium and the total amount of vanadium and chromium must be measured, which is equivalent to the indirect determination of chromium content

If the user needs the content of vanadium and chromium, there is no increase in workload. If only the content of chromium is needed, an additional vanadium content is analyzed, which increases the workload and analysis cost.

Images