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Indicator for simultaneous measurement of calcium, barium and magnesium in silicon-calcium-barium-magnesium by adopting EDTA titration method

An indicator, silicon-calcium-barium technology, applied in the magnesium indicator, EDTA complexometric titration joint measurement of calcium and barium in silicon-calcium-barium-magnesium, to achieve the effect of sensitive color development and reduced error

Inactive Publication Date: 2015-04-01
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the slow reaction of existing complexometric titration, and some indicators will have tailing and rigid effects, so that the selected indicator can Make the end point color change sensitive and easy to observe the color with naked eyes, and the analysis results are more accurate and reliable. Provide an EDTA titration method for joint determination of calcium, barium and magnesium indicators in silicon, calcium, barium and magnesium

Method used

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  • Indicator for simultaneous measurement of calcium, barium and magnesium in silicon-calcium-barium-magnesium by adopting EDTA titration method
  • Indicator for simultaneous measurement of calcium, barium and magnesium in silicon-calcium-barium-magnesium by adopting EDTA titration method
  • Indicator for simultaneous measurement of calcium, barium and magnesium in silicon-calcium-barium-magnesium by adopting EDTA titration method

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Embodiment Construction

[0012] 1. Method summary:

[0013] Weigh the sample in a polytetrafluoroethylene beaker (carry out a blank test with the sample), add nitric acid to dissolve the sample, add hydrofluoric acid dropwise until the sample is completely dissolved, and emit perchloric acid fumes. Add hydrochloric acid to dissolve the salts, transfer to a beaker, and dropwise add ammonia water to separate. Firstly, to determine the amount of calcium and barium, it is necessary to control the pH value to eliminate the influence of magnesium in the form of precipitation. Determination of calcium and magnesium content, adding potassium sulfate to generate barium sulfate to eliminate the influence of barium. Calcium is finally determined, and potassium sulfate is added while controlling the pH value, while eliminating the influence of barium and magnesium.

[0014] 2. Reagents:

[0015] The density of nitric acid is 1.42g / mL;

[0016] The density of hydrofluoric acid is 1.15g / mL;

[0017] The densit...

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Abstract

The invention relates to an indicator for simultaneous measurement of calcium, barium and magnesium in silicon-calcium-barium-magnesium by adopting an EDTA titration method. The indicator is characterized in that when the content of calcium and barium is to be measured, a calcein-alizarin mixed indicator is used; when the content of calcium and magnesium is to be measured, an o-cresolphthalein complexing agent is taken as the indicator; when the content of calcium is to be measured, a calcium indicator is used. The indicator has the advantages that unhooking operation is more convenient and labor-saving; hook closing is more reliable; the indicator is sensitive and rapid; errors caused by inaccurate observation of human eyes at the end point are reduced; EDTA complexometric titration is adopted for simultaneous measurement of calcium, barium and magnesium in the silicon-calcium-barium-magnesium, so that simultaneous measurement of the three elements calcium, barium and magnesium can be implemented in the same solution by just dissolving a sample by one time.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy analysis, and relates to an indicator for the combined measurement of calcium, barium and magnesium in silicon, calcium, barium and magnesium by EDTA complexometric titration. [0002] Background technique [0003] Silicon-calcium-barium-magnesium alloy is a new type of high-efficiency composite deoxidizer and desulfurizer, which is mainly used in deoxidation and phosphorus removal in molten steel. It can effectively remove impurities in steel and change the properties of inclusions in steel. Purify molten steel and improve the quality of steel. It has a good application prospect in the metallurgical industry. Therefore, it is very important to determine the content of calcium, barium and magnesium in silicon-calcium-barium-magnesium alloy. [0004] Complexation indicators commonly used in EDTA complexometric titration include calcium indicator, calcein, o-cresolphthalein complexing agent, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 戴文杰常欢刘建华王宴秋
Owner INNER MONGOLIA BAOTOU STEEL UNION
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