Determination method of trace iron in aluminum-containing phosphoric acid solution and aluminum masking agent therefor

Abstract

The invention relates to the technical field of a determination method of trace iron in an aluminum-containing phosphoric acid solution, and particularly to a determination method of trace iron in an aluminum-containing phosphoric acid solution and an aluminum masking agent for the determination method. The determination method comprises two steps of drawing a standard work curve of iron content and testing the iron content in a test sample solution. The determination method of the invention is simple in operation, high in test accuracy, and good in reproducibility, not only overcomes the defect in the prior art of impossible to detect due to the present of white aluminum hydroxide precipitate, but also solves the problems of poor trace iron detection accuracy and high cost in the track iron determination process by the atomic absorption spectrophotometry, and effectively expands the application scopes of determinating iron content in the phosphoric acid with the phenanthroline spectrophotometric method.

Description

technical field

[0001] The invention relates to the technical field of measuring trace iron in aluminum-containing phosphoric acid solution, and relates to a method for measuring trace iron in aluminum-containing phosphoric acid solution and an aluminum masking agent thereof. Background technique

[0002] The phenanthroline spectrophotometer method is one of the commonly used methods for the determination of iron in phosphoric acid. The method includes two steps. The first step is to draw the standard working curve of iron content. The second step is to test the determination of iron content in the sample solution. The first step The test solution used is a standard solution with known iron content, and the second step test solution uses a test sample solution. The other steps of these two steps are: add 5% to 10% of hydroxylammonium hydrochloride to the test solution 1 ml to 10ml, 10% to 30% sodium acetate solution 5 ml to 20ml, 0.1% to 0.5% o-phenanthroline 2 ml to 10ml, d...

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