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A method for detecting nitrate in hydrotalcite compound

A technology of hydrotalcites and compounds, which is applied in the direction of material analysis through observation of the influence of chemical indicators, and analysis through chemical reactions of materials, which can solve problems such as low sensitivity, false positives, and insoluble in water. Achieve the effect of improving product quality

Inactive Publication Date: 2019-03-05
马德君
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  • Description
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  • Application Information

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Problems solved by technology

However, in actual production, a certain amount of nitrate ions are often left in the hydrotalcite compound products obtained by the prior art, which seriously affects the quality and application range of the product, and cannot meet the needs of practical applications. It is particularly important to detect the nitrate
The existing technology shows that the qualitative detection of nitrate in hydrotalcite compounds can be carried out by using infrared spectroscopy, but the sensitivity of this method is low, and due to the interference of other impurities, false positive judgments are prone to occur
The current chemical detection methods for nitrate include brown ring test method, diphenylamine method, color-changing acid method, diphenylsemicarbazide method and other methods, but the detection objects of these methods are all nitrate ions in aqueous solution, while hydrotalcite compounds It is solid and insoluble in water, so its aqueous solution cannot be directly prepared for detection

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take 0.5g of hydrotalcite compound sample, add 4.0g of concentrated phosphoric acid, add 2.5g of deionized water, shake until the sample is completely dissolved to obtain a test solution. Take 0.5ml strong acid (H 2 SO 4 ) diphenylamine solution, add a drop of test solution, the system turns blue, indicating that the sample contains nitrate.

[0028] For the preparation method of strongly acidic diphenylamine solution, see "Handbook of Analytical Chemistry (Second Edition) Second Volume Chemical Analysis" edited by the Analytical Chemistry Teaching and Research Office of the Department of Chemistry, Hangzhou University, Beijing: Chemical Industry Press, 1997.

Embodiment 2

[0030] Take 0.5 g of hydrotalcite compound sample, add 3.0 g of concentrated sulfuric acid, add 2.5 g of deionized water, shake until the sample is completely dissolved to obtain a test solution. Take a drop of test solution, add a ferrous sulfate crystal, and then add a drop of concentrated sulfuric acid along the edge of the container, a brown ring appears along the ferrous sulfate crystal, indicating that the sample contains nitrate.

Embodiment 3

[0032] Take 0.5 g of a hydrotalcite compound sample, add 3.0 g of trifluoroacetic acid, add 2.5 g of deionized water, shake until the sample is completely dissolved to obtain a test solution. Slowly add 5.0 g of concentrated sulfuric acid, oscillate continuously to ensure uniform mixing; after cooling to room temperature, slowly add ferrous sulfate solution, no color is seen on the contact surface, indicating that no nitrate was detected in the sample.

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Abstract

The present invention provides a method for detecting nitrate in a hydrotalcite compound. After a hydrotalcite compound sample is dissolved with an acid, the nitrate is detected through a brown ring test process, a diphenylamine process, a chromotropic acid process or a diphenylsemicarbazide process. The method is practical, convenient, stabler, reliable and highly intuitive and can be used for detection and quality control of nitrate in hydrotalcite compounds.

Description

technical field [0001] The invention relates to a method for detecting nitrate in hydrotalcite compounds, in particular to a method for detecting nitrate in artificially synthesized hydrotalcite compounds. Background technique [0002] Hydrotalcite compounds are a class of layered compounds composed of positively charged layers and negatively charged anions filled between layers, with acidity, alkalinity, ion exchange, thermal stability, composition and structure controllability It is a new type of material with great application prospects, and has been widely used in medicine, catalysis, adsorption, ion exchange, flame retardant, insulating agent, anti-ultraviolet agent, etc. However, such compounds are rare in nature, with few varieties and high impurity content, which cannot meet the actual needs. The artificial synthesis methods of various hydrotalcite compounds just solve these problems. The artificial synthesis of hydrotalcite compounds is usually carried out by low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 马德君韩峰马高言陈卓远
Owner 马德君
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