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Method for performing complexometric titration on magnesium ions

A complexometric titration, magnesium ion technology, applied in the field of analytical chemistry, can solve the problems of narrow linear range, severe, matrix interference, etc., to achieve the effect of easy judgment, reduce analysis errors, and eliminate the interference of coexisting sodium ions

Inactive Publication Date: 2014-04-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

The atomic absorption method can only measure one element at a time and the linear range is narrow, and the matrix interference is serious

Method used

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  • Method for performing complexometric titration on magnesium ions
  • Method for performing complexometric titration on magnesium ions
  • Method for performing complexometric titration on magnesium ions

Examples

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Embodiment

[0053] The present invention is further illustrated by the following examples, and these examples are only for the purpose of illustration and do not limit the scope of the present invention. Except for the specific conditions indicated, the test methods in the examples were carried out according to conventional conditions.

[0054] Determination of the wavelength of the blank control:

[0055] Accurately pipette 10mL of 0.02mol / L magnesium chloride solution into a conical flask, add 10mL of ammonia buffer solution, use chrome black T as indicator, and titrate with EDTA, the solution changes from tartar red before titration to azure at the end of titration , this is a blank comparison experiment, and the solution at the end point of the titration is scanned in the visible light region to obtain λ 0 (627nm).

[0056] Example:

[0057] Accurately pipette 10mL of the mixed solution (containing 0.02mol / L magnesium chloride and different amounts of sodium chloride) into a 20...

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Abstract

The invention relates to the technical field of analytical chemistry and in particular discloses a method for performing complexometric titration on magnesium ions. Chrome black T serves as an indicator, and magnesium of a solution is titrated by using ethylene diamine tetraacetic acid (EDTA). The method is characterized in that the solution comprises magnesium ions and sodium ions; an ammonia buffer solution with the pH value being 10 and a masking agent are added into the solution before titration; the masking agent is mixed alcohol, hydroxylamine hydrochloride or a mixture of triethanolamine and mixed alcohol; the mixed alcohol is a normal butanol / ethanol mixture with the volume ratio of 1:(1-4); the maximal absorption wavelength of the titration end-point solution is close to blank reference wavelength. According to the method provided by the invention, interference of the sodium ions of the mixed solution can be effectively eliminated, accurate titration of the magnesium ions is realized and the average relative error can maintain below 1%. In the method provided by the invention, the titration end point is easy to judge.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a method for eliminating the influence of sodium ions in the process of complexometric titration of magnesium ions. Background technique [0002] my country is rich in salt lake resources, and the salt lake resources in Qinghai are the most representative. Salt lakes contain a large amount of K, Mg, Na, Li, B and other elements. The magnesium resources in Qinghai Salt Lake mainly include magnesium chloride and magnesium sulfate, with reserves of 4.18×1016 tons (total of magnesium chloride and magnesium sulfate), which are important resources for the preparation of inorganic salt chemical products. [0003] In the production process of chemical products using salt lake brine as raw material, Mg 2+ , Ca 2+ Content analysis is an important link. At present, the commonly used method is complexometric titration, and there are also spectrophotometry, ion chromatography,...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/33
Inventor 郭敏吴志坚李权高晓雷张慧芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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