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Method for rapidly testing unsymmetrical dimethylhydrazine residuals in daminozide

A rapid determination technology for unsymmetrical dimethylhydrazine, which is applied in the field of pesticide analysis and can solve problems such as difficult detection

Inactive Publication Date: 2012-08-01
XIAN HANGJIE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the end of the 1960s, my country began to produce Bijiu products. After entering the 21st century, the production technology has made great progress. In recent years, in order to meet the needs of the international market, unsymmetrical dimethylhydrazine residues have been produced. For bijiu products less than 30ppm, conventional analysis methods are difficult to detect the trace residue of unsymmetrical dimethylhydrazine in bijiu. Production and quality control are of great importance

Method used

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  • Method for rapidly testing unsymmetrical dimethylhydrazine residuals in daminozide

Examples

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Embodiment 1

[0018] 1) Mix 0.1 mol / L citric acid aqueous solution and 0.2 mol / L disodium hydrogen phosphate aqueous solution in a ratio of 100:185 to prepare 285 ml of buffer solution with pH=6.2.

[0019] 2) Prepare 0.3% sodium ferrocyanide developer solution.

[0020] 3) Accurately weigh three long-term samples with known unsymmetrical dimethylhydrazine content in three 25 ml graduated test tubes, add 20 ml of pH=6.2 buffer solution to dissolve, and then use a 1 ml pipette Accurately pipette 1 ml of 0.3% sodium ferrocyanide chromogen, shake well, use a dropper with a rubber tip to absorb the buffer solution to 25 ml, cover the lid, turn it upside down 5 times, and keep it at about 25°C Put it in a dark place for 1 hour in a cool environment. Prepare the solution of the sample to be tested in the same way as above, and put it in a dark place at about 25°C for 1 hour to develop color.

[0021] 4) Set the wavelength selection knob of the 722-type visible spectrophotometer to a working wav...

Embodiment 2

[0028] 1) Mix 0.1 mol / L citric acid aqueous solution and 0.2 mol / L disodium hydrogen phosphate aqueous solution in a ratio of 100:185 to prepare 285 ml of buffer solution with pH=6.2.

[0029] 2) Prepare 0.3% sodium ferrocyanide developer solution.

[0030] 3) Accurately weigh three long-term samples with known unsymmetrical dimethylhydrazine content in three 25 ml graduated test tubes, add 20 ml of pH=6.2 buffer solution to dissolve, and then use a 1 ml pipette Accurately pipette 1 ml of 0.3% sodium ferrocyanide chromogen, shake well, use a dropper with a rubber tip to absorb the buffer solution to 25 ml, cover the lid, turn it upside down 5 times, and keep it at about 25°C Put it in a dark place for 1 hour in a cool environment. Prepare the solution of the sample to be tested in the same way as above, and put it in a dark place at about 25°C for 1 hour to develop color.

[0031] 4) Set the wavelength selection knob of the 722-type visible spectrophotometer to a working wav...

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Abstract

The invention relates to a method for rapidly testing unsymmetrical dimethylhydrazine residuals in daminozide. The method comprises the following steps: preparing a buffer solution, preparing an amino sodium ferrocyanide color reagent solution, preparing a to-be-tested daminozide sample solution, covering a cover on the to-be-tested daminozide sample solution, mixing the to-be-tested daminozide sample solution uniformly, enabling the to-be-tested daminozide sample solution to develop color in a dark place, testing absorbance of a daminozide sample with a known content of unsymmetrical dimethylhydrazine, drawing a standard curve about the content of unsymmetrical dimethylhydrazine and the absorbance, testing the absorbance of the to-be-tested daminozide sample, and checking the content of unsymmetrical dimethylhydrazine corresponding to the absorbance in the to-be-tested daminozide sample, etc. According to the method, the technical problem that the unsymmetrical dimethylhydrazine residuals in the daminozide are difficult to test according to the conventional analysis method is solved, and the method is of great significance for the production and quality control over the product of daminozide.

Description

technical field [0001] The invention relates to a method for analyzing residual unsymmetrical dimethylhydrazine in bijiu, belonging to the technical field of pesticide analysis. Background technique [0002] Since the end of the 1960s, my country began to produce Bijiu products. After entering the 21st century, the production technology has made great progress. In recent years, in order to meet the needs of the international market, unsymmetrical dimethylhydrazine residues have been produced. For bijiu products less than 30ppm, conventional analysis methods are difficult to detect the trace residue of unsymmetrical dimethylhydrazine in bijiu. Production and quality control are of great significance. Contents of the invention [0003] The purpose of the present invention is to provide a method for detecting and analyzing free unsymmetrical dimethylhydrazine whose residual unsymmetrical dimethylhydrazine is less than 30ppm. [0004] Technical solution of the present inventio...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 郭友闫小宁苏雪春王卫国李军锋王龙龙陈帅白海龙李承柱马翔田建军陈卫民许峰何宇吉卉姚中东李军平许东兴杨玲张慧刘丽
Owner XIAN HANGJIE CHEM TECH
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