Method for quickly measuring content of MgO by calcium-magnesium total subtraction process

A technology of rapid determination and subtraction method, which is applied in the field of analysis and detection, can solve the problems of poor observation of end point color, error of analysis results, long titration process, etc., and achieve the effect of sensitive color reflection, high accuracy and shortened titration time

Inactive Publication Date: 2014-03-19
GEZHOUBA DANGYANG CEMENT
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Problems solved by technology

In the specific detection method provided by GB / T 176-2008, when measuring the total amount of calcium and magnesium, the masking agent, buffer solution and indicator are added first, and then EDTA is used for titration. There are many defects in this operation method: 1) The titration process Long, sour hands during stirring; 2) The color reaction is too slow; 3) It is difficult to observe the color of the end point, and it is very easy to over-titrate; 4) It will cause large errors in the analysis results

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  • Method for quickly measuring content of MgO by calcium-magnesium total subtraction process

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Embodiment

[0048] Adopt the method provided by the invention to measure the MgO content in the sample, determine to specifically comprise the following steps:

[0049] The processing method of the sample is sodium hydroxide melting.

[0050] 1) Determine the CaO content in the sample according to GB / T 176-2008, wherein the volume V2 of 0.015mol / L EDTA standard solution consumed when titrating calcium oxide is 39.6ml;

[0051] 2) Prepare the sample to be tested according to the method given in GB / T 176-2008;

[0052]3) Take 25ml of the sample solution to be tested, add 7ml of 20g / L potassium fluoride solution and let it stand for 2min, add water to dilute to 200ml, add 1ml of potassium sodium tartrate, 5ml of triethanolamine and mix well, then add 39.6ml to a concentration of 0.015mol / L The EDTA standard solution complexes all the CaO in the sample. Then add 25ml of buffer solution with pH=10 and mix well, add about 0.03g of acid chrome blue K-naphthol green B mixed indicator, the acid ...

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Abstract

The invention provides a method for quickly measuring the content of MgO by a calcium-magnesium total subtraction process, which specifically comprises the following steps: 1) measuring the content of Ca in a sample according to GB / T176-2008; 2) preparing a sample to be measured according to a method offered by the GB / T176-2008; 3) fetching the solution of the sample to be measured; adding water for diluting, sequentially adding potassium sodium tartrate and triethanolamine and mixing uniformly; adding an EDTA standard solution to complex all CaO in the sample while ensuring excessive EDTA; finally, adding an indicator and titrating with the EDTA standard solution to the end point; calculating the content of MgO according to a calcium-magnesium total subtraction process. By adopting the method provided by the invention, the titration time can be shortened, the color change is sharp and easy to observe, the working efficiency is greatly improved, and the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and in particular relates to a method for quickly measuring MgO content by subtracting the total amount of calcium and magnesium. Background technique [0002] At present, when measuring calcium and magnesium content in limestone, the determination of magnesium oxide in GB / T 176-2008 "Cement Chemical Analysis Methods" is generally carried out, that is, the determination is carried out by substitution method, firstly measure the calcium content in the sample, and then measure The total amount of calcium and magnesium in the sample, and finally the magnesium content can be calculated by subtracting the calcium content from the total amount of calcium and magnesium according to the subtraction method. In the specific detection method provided by GB / T 176-2008, when measuring the total amount of calcium and magnesium, the masking agent, buffer solution and indicator are added first, and then EDT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 赵向东严兰珍田太孝何春桃
Owner GEZHOUBA DANGYANG CEMENT
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