Method for detecting methylene blue absorption quantity of montmorillonite

Abstract

The invention relates to a method for detecting methylene blue absorption quantity of montmorillonite. The method comprises the following steps: (1) dispersing a montmorillonite test sample into water, adding a sodium pyrophosphate solution, stirring uniformly, heating to slight boiling and cooling to room temperature; (2) adding an excessive methylene blue standard solution, stirring to perform complete reaction, generating precipitate, filtering, collecting filtrate, adding a potassium dichromate standard solution into the filtrate, performing water bath, cooling and filtering, washing withwater and collecting the filtrate; (3) adding a sulfuric acid solution and potassium iodide and shaking up; and (4) performing titration by using a sodium thiosulfate standard solution until the solution is faint yellow, adding several drops of starch indicator olution is faint yellow to enable the solution to be blue, and performing titration until blue color disappears, wherein bright green color is the end point. Compared with the prior art, the method has the following advantages: the used reagents are wide in source and moderate in price; and the result obtained through measurement by the measuring method is high in repeatability and is accurate and effective.

Description

technical field [0001] The invention relates to the technical field of chemical component detection, in particular to a method for detecting blue absorption in montmorillonite. Background technique [0002] Montmorillonite is a hydrous layered aluminosilicate mineral, and the interlayer cations can be exchanged with monovalent cations in aqueous solution. Methylene blue is a polar molecule that produces monovalent cations in aqueous solution, can replace montmorillonite and exchange cations, and can be adsorbed in the form of a hydroxide in the alkaline medium of sodium pyrophosphate. Therefore, the dispersion Montmorillonite in aqueous solution has the ability to adsorb methylene blue, and the amount of adsorption is the amount of blue absorption. [0003] The measuring method of blue absorbing amount in existing montmorillonite is to adopt halo method, namely dropwise methylene blue standard solution in sample solution with burette under agitation, the methylene blue of a...

AI Technical Summary

Problems solved by technology

[0004] (1) Only use the naked eye to observe the appearance of the light blue halo to determine the end point, and the error is relatively large;

[0005] (2) There will be errors due to the large titrated volume, which will affect the accuracy of the experimental results;

[0006] (3) For many technicians, especially novices, it is difficult to judge the end point of the halo method blue absorption test

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