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Chromium detection polymer film and its preparation method and use

A polymer film and mixture technology, applied in the field of analysis, can solve the problems of unsuitable, rapid detection or use restrictions of heavy metal chromium analysis methods, and achieve good application prospects, low cost and good repeatability

Active Publication Date: 2012-11-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the commonly used analysis methods for heavy metal chromium in existing water bodies are not suitable for rapid detection or use is limited to a certain extent, and provide a polymer film, preparation method and application for rapid detection of heavy metal chromium with a wide range of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example example 1

[0021] Preparation of polymer films, including:

[0022] (1) Photografting on the surface of the polymer film: use benzophenone as the photoinitiator, use the aqueous solution of N-vinylpyrrolidone and N, N'-methylenebisacrylamide as the water phase, and use n-decane It is an oil phase, and Span 20 and Tween 60 are inverse microemulsions composed of surfactants, wherein the mass concentration of benzophenone in the emulsion is 0.5%, and the concentration of N-vinylpyrrolidone in the water phase is 15%. The molar ratio of N-vinylpyrrolidone to N, N'-methylenebisacrylamide is 30:1, the concentration of surfactant in the oil phase is 20%, and the mass ratio of Span 20 to Tween 60 is 2: 1. The oil-water ratio is 6:4, and a uniform microemulsion is formed by mechanical stirring. The ethylene terephthalate polymer film is placed in a petri dish with a diameter of 8 cm, soaked in 10 ml of the above microemulsion Irradiate under high-pressure mercury lamp (1KW) for 30 minutes, the gr...

example example 2

[0029] According to the preparation method of Example 1, the concentration of N-vinylpyrrolidone monomer in the water phase in the microemulsion is 30%, and the other conditions remain unchanged, so as to prepare a polymer film for rapid detection of heavy metal chromium.

example example 3

[0031] According to the preparation method of Example 1, the concentration of N-vinylpyrrolidone monomer in the water phase of the microemulsion is 10%, the concentration of acrylamide monomer is 5%, and the other conditions are unchanged, and a polymer film for rapid detection of heavy metal chromium is prepared. .

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Abstract

The invention discloses a chromium detection polymer film and its preparation method and use, and belongs to the technical field of analysis. The chromium detection polymer film is characterized in that a layer of nano-particles are coated on the surface of a polymer film as a matrix by photografting; a mixture of dodecyltrimethylammonium bromide, polyvinyl alcohol and citric acid is loaded on the nano-particles; and diphenylcarbazide (DPC) as a color-developing agent is loaded on the mixture. The preparation method comprises the following steps that a layer of the nano-particles are coated on the surface of the polymer film as a matrix by photografting; and after pretreatment, the DPC as a color-developing agent is loaded on the nano-particles. In use, a standard solution and the chromium detection polymer film undergo a reaction so that standard color gradation is obtained; and after a reaction of a solution needing to be detected and the chromium detection polymer film, a color is compared with the standard color gradation so that a detection result is obtained. The chromium detection polymer film has high detection precision and good repeatability, can be operated easily, realizes fast on-site detection of chromium ions in an environmental water sample, avoids use of a traditional large-scale instrument in chromium detection, and has a low cost and a good application prospect.

Description

technical field [0001] The invention relates to a polymer film for detecting chromium, a preparation method and an application thereof, and belongs to the technical field of analysis. Background technique [0002] Trivalent chromium is an essential trace element for the human body. It is closely related to lipid metabolism and can increase the decomposition and excretion of cholesterol in the human body. It is an effective component of the glucose energy factor in the body and can assist insulin in utilizing glucose. If a large amount of chromium, especially hexavalent, will pollute the environment and seriously endanger human health. [0003] Chromium exists widely in nature, and its natural source is mainly rock weathering, most of which are trivalent; the main source of man-made pollution is the discharge of industrial chromium-containing waste gas and wastewater. Industrial wastewater is mainly composed of hexavalent chromium compounds, often in the form of chromate ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78C08J7/12C08J7/18
Inventor 杨万泰吴万玲赵京波马育红
Owner BEIJING UNIV OF CHEM TECH
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