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

A method of determination, a technology of trace iron, which is applied in the direction of material analysis through observation of the influence of chemical indicators, and analysis through the chemical reaction of materials, which can solve the problems of the influence of aluminum ion detection process and achieve poor detection accuracy. , Solve the effect of high cost and high test accuracy

Active Publication Date: 2012-07-11
石河子众金电极箔有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for the determination of trace iron in aluminum-containing phosphoric acid solution, which overcomes the deficiencies of the above-mentioned prior art, and solves the problem of aluminum in the determination of iron content in phosphoric acid solution. The impact of ions on the detection process

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

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Embodiment 1

[0015] Embodiment 1, the assay method of trace iron in this aluminum-containing phosphoric acid solution is carried out according to the following steps:

[0016] The first step is to test known iron-containing solutions with a spectrophotometer and draw a standard working curve of iron content: take no less than 3 iron content standard solutions, add 1% to 10% hydroxylammonium hydrochloride 1ml to 10ml, 10% to 50% triammonium citrate 1ml to 10 ml, adjust the pH value to 4 to 6, add 0.1% to 1% o-phenanthroline 1ml to 10ml, and mix each time the above reagent is added , heated to 60°C to 85°C in a water bath, kept at constant temperature for 5 minutes to 30 minutes, removed and cooled to room temperature, diluted to the mark with pure water, and mixed well; wavelength λ=510nm, tested its absorbance with a spectrophotometer; is the ordinate, and the iron content is the abscissa, draw the standard working curve;

[0017] The second step, the determination of iron content i...

Embodiment 2

[0018] Embodiment 2, the difference with embodiment 1 is: embodiment 2 is in the first step or / and the second step, is that the acetic acid of 5.5 to 6.0 and sodium acetate buffer adjust the pH value to 4 to 6 with pH.

Embodiment 3

[0019] Embodiment 3, the difference with Embodiment 1 and 2 is: the addition amount of the acetic acid-sodium acetate buffer solution of embodiment 3 is 5.0ml.

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 李新芳
Owner 石河子众金电极箔有限公司
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