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Method for measuring content of calcium ions

A testing method and technology of calcium ions, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as cementing construction risks, and achieve simple measurement steps and measurement. high precision effect

Inactive Publication Date: 2012-05-23
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Problems solved by technology

After dissolving a large amount of salt in the cement slurry, the properties such as water loss, rheology, thickening, and strength will change greatly, which will bring great risks to the cementing construction and even cause serious accidents

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  • Method for measuring content of calcium ions

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Embodiment

[0028] A kind of test method of calcium ion content that the present invention relates to, its concrete steps are as follows:

[0029] (a) In buffer solution, with chrome black T as indicator, measure the total amount by titration with ethylenediaminetetraacetic acid standard titration solution;

[0030] (b) In the medium, use sodium sulfate as a precipitating agent to remove barium and strontium ions in the water sample;

[0031] (c) The sample with barium and strontium ions removed is titrated with ethylenediaminetetraacetic acid standard titration solution in the buffer solution with chrome black T as indicator respectively, and the combined amount of magnesium and calcium ions is measured;

[0032] (d) Using a calcium reagent as an indicator in the medium, titrate with a standard titration solution of ethylenediaminetetraacetic acid to measure the calcium ion content.

[0033] In the step (a), the pH value of the buffer solution is 10.

[0034] In the step (a), the conce...

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Abstract

The invention discloses a method for measuring the content of calcium ions. The method comprises the steps of: titrating by using ethylene diamine tetraacetic acid for measuring the total quantity; removing barium and strontium ions in a water sample; titrating by using the ethylene diamine tetraacetic acid for measuring resultant of magnesium and calcium ions; and titrating by using the ethylene diamine tetraacetic acid for measuring the content of the calcium ions. In brine solutions with different salt contents and polymer solutions of the brine solutions, gypsum ore is scoured for a certain time, the content of the Ca<2+> dissolved in the solution is measured, so that the dissolving capacity of different brine solutions to the gypsum ore is obtained. The method has the advantages of high measurement precision and simple measurement steps.

Description

technical field [0001] The invention relates to a method for testing calcium ion content. Background technique [0002] In the mid-1980s, domestic and foreign studies on the corrosion of cement stone by acid gas were started to improve the corrosion resistance of the cement sheath. In terms of preventing the cement sheath from being corroded, domestic and foreign mainly focus on CO 2 and SO 4 2- conducted indoor and on-site analysis and research on the corrosion and anti-corrosion methods of cement stones, and for high H content 2 S and its relationship with CO 2 Under the condition of coexistence, there are few reports on the mechanism of cement stone corrosion and anti-corrosion technical methods. [0003] About CO 2 Corrosion problems, reported as early as 1924, thought that at the same pH value CO 2 The corrosivity of aqueous solution is stronger than that of hydrochloric acid; In 1940, relevant experts proposed that CO 2 Report on the hazards of corroded casing;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 常萍
Owner 常萍
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