Method for testing content of titanium dioxide by complexometric titration-back titration method

A titanium dioxide and titration technology, applied in the field of chemical testing, can solve the problems of indicator discoloration, high analysis cost, limitations, etc., and achieve the effects of improved accuracy and precision, obvious discoloration process, and accurate endpoint judgment.

Inactive Publication Date: 2013-05-08
JIANGSU ALAND NOURISHMENT
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Problems solved by technology

[0004] It is known that there are aluminum reduction method and complexometric titration method for the determination of titanium dioxide content. However, the aluminum reduction method requires specific analytical instruments and standard substances, and the analysis cost is high, which is greatly restricted in actual production.
Complexometric titration back titration is a commonly used analysis method in volumetric analysis. The principle is that excess disodium EDTA EDTA reacts quantitatively with metal ions to form a stable soluble complex, and the remaining disodium ethylenediaminetetraacetate Quantitative reaction with zinc titration solution can obtain the content of titanium dioxide in the sam...

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Embodiment Construction

[0011] A method for measuring titanium dioxide content by complexometric titration back titration, characterized in that: comprising the following steps: 1), sample processing: take about 1.0 g of a sample dried at 105° C. for 3 hours, accurately weighed, put in a platinum crucible, Add 2g of potassium carbonate, mix well, blaze at 900°C for 30min, let cool, transfer the residue into a 100ml measuring bottle with a mixture of 20ml of water and 30ml of hydrochloric acid, put it on a water bath and heat until the solution is clear, let it cool, and dilute with water to Scale, shake well; 2), optimize the operating procedures, reasonably adjust the concentration of PH alkali in the solution: accurately measure 10ml of the sample solution in 1), add 100ml of water and 4ml of concentrated hydrogen peroxide solution, mix well, and precisely add 0.05mol / l B 50ml of disodium diaminetetraacetic acid titration solution, let stand for 5min, add 1 drop of methyl red indicator solution, neu...

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Abstract

The invention provides a method for testing content of titanium dioxide by a complexometric titration-back titration method. The method comprises the following steps of: (1) treating a sample; (2) optimizing an operation process, and reasonably adjusting the concentration of solution pH alkali; and (3) adding a buffer solution; and then calculating out the content of the titanium dioxide in the sample. By adopting the method provided by the invention, the acidity of the solution at the end point of titration can be controlled well, an indicator is ensured to change the color obviously, the precision of sample test is improved, and the relative deviation of the sample test result is less than 0.3%.

Description

technical field [0001] The invention relates to the field of chemical testing, in particular to a method for determining the content of titanium dioxide by complexometric titration back titration. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is a white solid or powdery amphoteric oxide. Titanium dioxide is stable in nature, not easy to undergo chemical changes, and has strong adhesion, high melting point, non-toxic, and is the best white pigment. It is mostly used in photocatalysts. Cosmetics, and used to make fire-resistant glass, glaze, enamel, clay, high-temperature experimental vessels, etc. [0003] As an important chemical raw material, titanium dioxide is widely used in many fields, and the content of titanium dioxide directly affects the quality of the product. Therefore, the rapidity and accuracy of quantitative analysis of titanium dioxide have become an important criterion for the detection method. This method is mainly appl...

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Application Information

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IPC IPC(8): G01N21/79
Inventor 陈惠勋张沛霞
Owner JIANGSU ALAND NOURISHMENT
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