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Volumetric analysis method adopting ascorbic acid to carry out reductometry on iron

A technology of ascorbic acid and capacity analysis, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of unsatisfactory measurement results, expensive reducing agents, and reducing agent purity. Low cost, short measurement time, and environmental friendliness

Inactive Publication Date: 2013-04-24
长治学院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of the above methods have low accuracy and are not perfect; some reducing agents are not high in purity and contain trace iron, and the measurement results are not ideal; some reducing agents are expensive and are rarely used in laboratories.

Method used

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  • Volumetric analysis method adopting ascorbic acid to carry out reductometry on iron
  • Volumetric analysis method adopting ascorbic acid to carry out reductometry on iron
  • Volumetric analysis method adopting ascorbic acid to carry out reductometry on iron

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Experimental program
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Effect test

Embodiment 1

[0027] Dissolve the iron-containing sample according to the literature method, take the iron sample solution in a 250mL Erlenmeyer flask, add the newly prepared ascorbic acid solution drop by drop, and heat to about 30°C, shake slowly to make it fully react until the yellow color disappears, and then Add an extra drop of ascorbic acid solution. Add 2,6-dichloroindophenol solution dropwise until the solution changes from colorless to light pink, and oxidize the remaining ascorbic acid. Then slowly add sulfur-phosphorus mixed acid dropwise, add dropwise sodium diphenylamine sulfonate indicator, and immediately use K 2 Cr 2 o 7 The standard solution was titrated to a stable purplish red as the end point.

[0028] The iron content (mass fraction) in the iron-containing sample is calculated by the following formula:

[0029]

[0030] In the formula:

[0031] c : concentration of potassium dichromate standard solution, mol / mL;

[0032] V : volume of potassium dichromate s...

Embodiment 2

[0040] Using the classic stannous chloride-mercuric chloride-potassium dichromate method and the method of the present invention, that is, the ascorbic acid-2,6-dichloroindophenol-potassium dichromate method, the same iron-containing sample is subjected to comparative determination. The measurement results are shown in Table 3. It shows that the accuracy of the method of the present invention is high.

[0041]

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Abstract

The invention discloses a volumetric analysis method adopting ascorbic acid to carry out reductometry on iron. The method is characterized by dissolving an iron-containing sample by a conventional method, quantitatively reducing Fe<3+> to Fe<2+> with ascorbic acid, then oxidizing the excessive ascorbic acid with a 2,6-dichloroindophenol solution, in a sulfuric acid and phosphoric acid mixed environment, taking sodium diphenylaminesulfonate as an indicator and titrating Fe<2+> with a potassium dichromate standard solution until stable purple red appears to be the end point and computing the mass fraction of iron in the iron-containing sample. The method has the beneficial effects that a highly toxic mercuric chloride reagent is avoided and pollution is reduced; and the analysis method is easy to operate, has high accuracy and is suitable for determining the content of the major component iron in iron ores and iron powder.

Description

technical field [0001] The invention relates to an iron analysis method, in particular to a volumetric analysis method using ascorbic acid as a reduction titrant for titration determination of iron content. Background technique [0002] Iron is one of the most widely distributed metal elements on the earth. The content of iron in iron ore is relatively high, generally between 20% and 70%. In the routine analysis of iron ore, the determination of total iron content is an important determination item. The classic analytical methods are stannous chloride-mercuric chloride-potassium dichromate volumetric method, stannous chloride-mercuric chloride-cerium sulfate volumetric method. The basic principle is: in hot, concentrated hydrochloric acid medium, use tin protochloride to dissolve Fe in the test solution 3+ reduced to Fe 2+ , the excess stannous chloride is oxidized and removed by mercuric chloride, and in the presence of sulfuric acid-phosphoric acid mixed acid, with sodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 申双龙李敏郝利花
Owner 长治学院
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