Sample pretreatment method suitable for azo dye detection

A sample pretreatment, azo dye technology, applied in the field of sample pretreatment in analytical chemistry, can solve problems such as health hazards, and achieve the effects of improving selectivity, increasing specific surface area, and increasing adsorption capacity

Active Publication Date: 2014-05-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After azo dyes are ingested into the human body, they will be metabolized into carcinogenic aromatic amines, which will bring great health hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Sample: environmental water sample

[0026] Target substances: Acid Yellow 9, Acid Golden, Acid Orange.

[0027] Nylon 6 is used as raw material, formic acid is used as solvent, and the mass concentration of nylon 6 is 25%. The electrospinning solution is obtained by magnetic stirring for 6 hours, and the nanofiber template is prepared by electrospinning; the nanofiber template is placed in ethanol, and then pyrrole is added in turn. Monomer solution and ferric chloride solution were polymerized for 1 hour under magnetic stirring; the nanofibers deposited with polypyrrole were taken out, and cleaned ultrasonically with water-ethanol-water in sequence until the cleaning solution was colorless and clear; soaked in formic acid for 2 hours , taken out, rinsed with water for 2 to 3 times, and dried naturally at room temperature to obtain hollow tubular polypyrrole nanofibers.

[0028] Weigh 2.0 mg of nanofibers and load them into a membrane-disk solid-phase extraction appar...

Embodiment 2

[0030] Sample: environmental water sample

[0031] Target substances: Acid Yellow 9, Acid Golden, Acid Orange.

[0032]Using polycaprolactone as raw material, chloroform-N,N-dimethylformamide (30:70, v / v) as solvent, the mass concentration of polycaprolactone is 18%, magnetic stirring for 12 hours to obtain electrospinning solution , the nanofiber template was prepared by electrospinning; the nanofiber template was placed in acetonitrile, and then the pyrrole monomer solution and the ferric chloride solution were added in sequence, and polymerized for 3 hours under magnetic stirring; the nanofiber deposited with polypyrrole was taken out, Ultrasonic cleaning with water-acetonitrile-water in sequence until the cleaning solution is colorless and clear; soak in chloroform-N,N-dimethylformamide (30:70, v / v) for 48 hours, take it out, rinse with water for 2~ 3 times, and dried naturally at room temperature to obtain hollow tubular polypyrrole nanofibers.

[0033] Weigh 1.0 mg of ...

Embodiment 3

[0035] Sample: Soy Products

[0036] Target substance: basic orange

[0037] Using polystyrene as raw material, N,N-dimethylformamide-tetrahydrofuran (40:60, v / v) as solvent, the mass concentration of polystyrene is 10%, magnetic stirring for 8 hours to obtain electrospinning solution, electrostatic Prepare the nanofiber template by spinning method; place the nanofiber template in acetonitrile, then add pyrrole monomer solution and potassium perchlorate solution in sequence, and polymerize under magnetic stirring for 1 hour; take out the nanofiber deposited with polypyrrole, and wash it with water-acetonitrile -Water is ultrasonically cleaned in sequence until the cleaning solution is colorless and clear; soak in N,N-dimethylformamide-tetrahydrofuran (40:60, v / v) for 36 hours, take it out, rinse with water 2 to 3 times, and store at room temperature and then dried naturally to obtain hollow tubular polypyrrole nanofibers.

[0038] Weigh 4.0 mg of nanofibers and fill them int...

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PUM

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Abstract

The invention provides a sample pretreatment method for hollow tubular polypyrrole naofiber-based azo dye detection. Various form reservation effects beween polypyrrole and azo dye modules are formed, and extraction selectivity of a target object is raised. In comparison with extraction efficiency by a commonly-used micron-sized solid-phase extraction medium, extraction efficiency is raised by a nanofiber nanostructure. By the hollow tubular polypyrrole nanofiber, specific surface area of the nanofiber is increased in comparison with specific surface area of solid core-shell nanofiber with a template, and absorption capacity is raised. Only by the use of several milligrams of polypyrrole nanofiber and several hectolambdas of an eluting solvent, high-selectivity high-efficiency extraction of various azo dyes in various practical samples can be realized, the sample matrix will not influence detection of a target object, and extraction efficiency is greatly raised in comparison with that of a commercially-produced solid phase extraction cartridge.

Description

technical field [0001] The invention provides a sample pretreatment method suitable for azo dye detection. The invention belongs to the technical field of sample pretreatment in analytical chemistry. Background technique [0002] Azo dyes are widely used in textile, leather, paper and other industries, and are discharged into the environment along with industrial waste or wastewater; because of their good coloring properties and low prices, they are also illegally added to aquatic products, soybean products, condiments and other foods. Therefore, the human body can directly or indirectly ingest azo dyes. When azo dyes are ingested into the human body, they will be metabolized into carcinogenic aromatic amines, causing great health hazards. Therefore, it is necessary to monitor the content of azo dyes in environmental samples or food. [0003] The actual sample matrix of environmental and food samples is complex and the content of the target substance is extremely low (μg / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34
Inventor 许茜祁菲菲李晓晴杨碧漪高海涛
Owner SOUTHEAST UNIV
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