Analysis method for determining calcium fluoride in fluorite by potentiometric titration

A potentiometric titration and analysis method technology, which is applied in the field of analysis, can solve the problems of easy error in human judgment and insignificant color change at the end point of indicator titration, and achieve the effects of avoiding errors, improving accuracy, and accurate detection results

Pending Publication Date: 2021-04-23
广西北港新材料有限公司
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Problems solved by technology

Since the color change at the end point of the titration of the indicator is not significant, human judgment is prone to errors, so a highly sensitive, precise, accurate and efficient determination method is needed

Method used

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  • Analysis method for determining calcium fluoride in fluorite by potentiometric titration
  • Analysis method for determining calcium fluoride in fluorite by potentiometric titration
  • Analysis method for determining calcium fluoride in fluorite by potentiometric titration

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Embodiment 1

[0054] This implementation provides an analytical method for the determination of calcium fluoride in fluorite by potentiometric titration. The content of total calcium and calcium carbonate is determined by potentiometric titration with EDTA standard solution, and the titrated total calcium content is subtracted from the titrated carbonic acid. Calcium content, calculate the content of calcium fluoride in fluorite. Specific steps are as follows:

[0055] Potentiometric titration determination of total calcium content

[0056] (1) Weigh 0.5g (accurate to 0.1mg) of fluorite sample in a 250mL beaker, add a few drops of absolute ethanol, add 50ml of mixed acid (hydrochloric acid-boric acid-sulfuric acid), cover with a watch glass, heat for 30min, and take Cool down, rinse the watch glass and beaker with water, and dilute to 100mL; filter, and make up to 250mL (denoted as V).

[0057] (2) Pipette 25.00 mL of the sample solution in step (1) (denoted as V 1 ) into a special beake...

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Abstract

The invention discloses an analysis method for determining calcium fluoride in fluorite by potentiometric titration. The analysis method comprises the following steps: preparing a sample solution, performing potentiometric titration determination on the total calcium content, performing potentiometric titration determination on the calcium carbonate content and calculating the calcium fluoride content; wherein potentiometric titration is carried out by adopting an EDTA standard solution, and the content of calcium fluoride in the fluorite is calculated by subtracting the content of calcium carbonate measured by titration from the content of total calcium measured by titration. An indication electrode for potentiometric titration is a Ca electrode, reference electrodes are Ag and AgCl reference electrodes, and the total calcium content is determined in the presence of a masking agent and a precipitant; the sample solution is leached with acetic acid, and the content of calcium carbonate is determined. A potentiometric titration method is used for replacing a traditional manual titration method, the judgment on a titration end point is stronger, and a detection result is more accurate. Errors caused by multiple times of titration are avoided, especially detection errors caused by the judgment of titration end points of different persons are avoided, and the accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of analysis, in particular to an analysis method for measuring calcium fluoride in fluorite. Background technique [0002] At present, the standard method for the determination of calcium fluoride in fluorite is mostly used: GB / T5195.1 Determination of calcium fluoride in fluorite, this method uses the traditional titration method to titrate the total calcium content, and then subtracts the amount of calcium carbonate in the sample , calculate the mass fraction of calcium fluoride in the sample. But for the traditional manual titration method, the indicator is usually used to indicate the titration end point. Since the color mutation of the indicator titration end point is not significant, human judgment is prone to errors, so a high-sensitivity, precise, accurate and efficient determination method is required. SUMMARY OF THE INVENTION [0003] In view of the problems existing in the prior art, the objec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/38G01N1/44
CPCG01N31/16G01N1/38G01N1/44
Inventor 罗锦辉黄磊何活源庞其凤沈俊峰
Owner 广西北港新材料有限公司
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