Cement hexavalent chromium test powder indicator and preparation method thereof

A hexavalent chromium and indicator technology, which is applied in the direction of material analysis, measuring device, color/spectral characteristic measurement, etc. by observing the influence on chemical indicators, can solve the problems of long preparation time, short shelf life, poor water solubility, etc. Achieve the effects of improving preparation efficiency, improving detection sensitivity, and increasing coverage

Active Publication Date: 2019-10-01
浙江鑫月新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a cement hexavalent chromium test powder indicator and its preparation method to solve the problems of poor water solubility, short shelf life, long preparation time and pH sensitivity of the cement hexavalent chromium color developer in the prior art question

Method used

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  • Cement hexavalent chromium test powder indicator and preparation method thereof
  • Cement hexavalent chromium test powder indicator and preparation method thereof
  • Cement hexavalent chromium test powder indicator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Disperse acrylic acid in deionized water to form a mixed solution; add diphenylcarbazide acetone solution containing initiator azobisisobutyronitrile dropwise to the mixed solution, and heat in a water bath at a temperature not exceeding 50°C , by stirring and freeze-drying to obtain a hexavalent chromium developer diphenylcarbazide copolymerized modified polymer.

[0044] Adding the hexavalent chromium developer diphenylcarbazide copolymerized modified polymer with a mass ratio of 68 is added to the dispersion homogenizer;

[0045] Then add quality preserving agent vitamin C 1.0, cosolvent acetamide 0.4, acidity regulator sodium bicarbonate 30 and stabilizer disodium edetate 0.6. After stirring and drying, the cement hexavalent chromium test powder indicator is obtained.

Embodiment 2

[0047]Disperse vinyl acetate in deionized water to form a mixed solution; add diphenylcarbazide acetone solution containing initiator potassium persulfate dropwise to the mixed solution, and heat in a water bath at a temperature not exceeding 50°C. After being stirred and freeze-dried, a hexavalent chromium developer diphenylcarbazide copolymerized modified polymer is obtained.

[0048] Add the hexavalent chromium developer diphenylcarbazide copolymerized modified polymer with a mass ratio of 70 into the dispersion homogenizer;

[0049] Then add quality preserving agent vitamin C 0.5, cosolvent acetamide 1.5, acidity regulator sodium bicarbonate 27 and stabilizer disodium edetate 1.0. After stirring and drying, the cement hexavalent chromium test powder indicator is obtained.

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Abstract

The invention provides a powder indicator for quickly determining cement hexavalent chromium content. The powder indicator is characterized in that the powder indicator is prepared from the followingcomponents in parts by weight ratio: 65-70 parts of hexavalent chromium color developing agent diphenylcarbazide copolymerization modified polymer, 0.15-1.0 part of quality assurance agent vitamin C,0.15-2.0 parts of cosolvent acetamide, 25-30 parts of acidity regulator sodium bicarbonate, and 0.15-1.0 part of stabilizer ethylenediamine tetraacetic acid disodium salt. The powder indicator is powdery solid, and does not contain organic solvent and water, the stability of the indicator is improved, and the effective storage time is prolonged; the powder indicator can be stably stored for 1-2 years normally under a sealing light-avoiding condition. The powder indicator can be quickly dissolved in the water, and the defect that the color developing agent diphenylcarbazide is low in solubilityin water and easy to oxidize and degenerate in organic solvent or water is overcome. The indicator provided by the invention can be directly added in the to-be-tested sample solution, the detection is quick and sensitivity, the experiment time is saved, the determination index completely conforms to the national standard, and has extensive popularization and application value.

Description

technical field [0001] The invention relates to a detection indicator and a preparation method thereof, in particular to an indicator for determining the hexavalent chromium content of cement and a preparation method thereof. Background technique [0002] In recent years, the problem of hexavalent chromium pollution in cement has attracted great attention from relevant state departments. In October 2015, the national standard "GB 31893-2015 Limits and Determination Methods of Water-Soluble Chromium (VI) in Cement" came into effect, and the accurate determination of hexavalent chromium ion content in cement has become a routine and important cement technology index. When testing the chromium ion content of a cement sample, it is necessary to add an acetone solution containing a hexavalent chromium developer diphenylcarbazide to the cement filtrate to be tested, and then detect the absorbance value of the sample at a light wavelength of 540nm. According to the hexavalent c...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78G01N21/3577
CPCG01N21/31G01N21/78G01N21/3577
Inventor 梁锦徐锋
Owner 浙江鑫月新材料科技有限公司
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