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Method for detecting metal ion contents in zinc stearate and calcium stearate composite salt

A technology of calcium stearate and zinc stearate is applied in the preparation of test samples, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., so as to achieve easy operation and method. Simple, accurate results

Inactive Publication Date: 2014-01-15
NANTONG XINBANG CHEM
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Problems solved by technology

The existing calcium stearate GB / T2424-2012 and zinc stearate GB / T3667-2012 inspection standards are only applicable to the detection of corresponding stearate monomers, and the standards for stearate mixtures or compounds cannot meet the detection requirements requirements, but such compound or mixture does exist in the market, and customers are willing to use it, so it is necessary to invent a method that can detect the content of each metal ion in zinc stearate and calcium stearate compound salt

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0017] Accurately weigh 1.5g (accurate to 0.000lg) compound zinc stearate and calcium salt, put it into the iodine measuring bottle, then add 10ml1+2 dilute nitric acid, 5ml alcohol, 10ml distilled water, heat the iodine measuring bottle, heat Until the oil layer is transparent, cool down; filter out the solid oil layer, pour the solution into a 50ml volumetric flask, wash the iodine volumetric flask with 5ml of distilled water three times, pour the washing liquid into the volumetric flask, add distilled water to the mark; take 10ml of the solution into a triangular flask, and use The mass fraction is 10% ammonia water to neutralize to PH=8, add 5ml of ammonia water-ammonium chloride buffer solution, 4 drops of chrome black T indicator, and titrate with 0.0236mol / l EDTA standard solution until the solution is pure blue. end. Record the titrated volume, extremely V 1 ; Take another 10ml of the solution into the Erlenmeyer flask, neutralize it with 10% ammonia water to pH=5-6, ...

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Abstract

The invention discloses a method for detecting metal ion contents in zinc stearate and calcium stearate composite salt. The method comprises the following steps: accurately weighing composite stearate, adopting a complexometric titration method, utilizing the different capacities of complexing metal ions of an EDTA sodium solution under different acid and alkaline conditions, recording the volume of the consumed EDTA sodium solution, and calculating the content of each metal ion. The method provided by the invention is simple and easy to operate, and the detected stearate metal contents are accurate and reliable.

Description

technical field [0001] The present invention relates to a kind of method that detects each metal ion content in zinc stearate, calcium stearate compound salt, particularly relates to a kind of complexometric titration method detection each metal ion content in zinc stearate, calcium stearate compound salt Methods. Background technique [0002] Stearates such as zinc stearate and calcium stearate are often used in products at the same time due to their synergistic and complementary effects in other products, such as stabilizers, foaming agents, lubricants, etc. Therefore, manufacturers often produce this compound stearate. But it was found that there is simply no standard that can be applied to the method of measuring this complex. The existing calcium stearate GB / T2424-2012 and zinc stearate GB / T3667-2012 inspection standards are only applicable to the detection of corresponding stearate monomers, and the standards for stearate mixtures or compounds cannot meet the detecti...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N1/28
Inventor 顾建荣段辉丽
Owner NANTONG XINBANG CHEM
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