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Method for identifying printing ink of ball pen

A ballpoint pen and ink technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of low detection sensitivity of thin-layer chromatography, low separation efficiency of liquid chromatography, large amount of mobile phase, etc., achieve good separation effect, improve Good separation efficiency and method precision

Inactive Publication Date: 2008-12-24
UNIMICRO SHANGHAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of the above identification methods are: the detection sensitivity of thin layer chromatography is low, and the amount of sample is large; the gas chromatography can only detect components with low boiling points; the separation efficiency of liquid chromatography is low, and the amount of mobile phase is large

Method used

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  • Method for identifying printing ink of ball pen
  • Method for identifying printing ink of ball pen
  • Method for identifying printing ink of ball pen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Ballpoint pen ink model: AA1672, manufacturer: Shanghai Biganzi Industry and Trade Co., Ltd.

[0024] Draw 50 lines with a length of 0.5 cm each on blank paper with a ballpoint pen filled with the above ink, cut off the lined paper, add 1 ml of absolute ethanol, soak for 20 min, filter the resulting solution with a 0.22 μm microporous membrane, and collect the filtrate Prepare a sample solution. The prepared sample solution was directly injected into the pressurized capillary electrochromatograph for analysis, and the injection volume was controlled to be 700nl. Control analysis time 40min. The control analysis conditions are as follows: chromatographic column: a quartz capillary column packed with C18 with a particle size of 5 μm, an inner diameter of 150 μm, a column length of 55 cm, and an effective column length of 30 cm. Mobile phase: A component: a matrix made of 5 parts by weight of acetonitrile and 95 parts by weight of water, plus 0.05% trifluoroacetic acid e...

Embodiment 2

[0026] Ballpoint pen ink model: WG-710A, manufacturer: Tonglu Wengang Pen Co., Ltd.

[0027] Draw 50 lines with a length of 0.5 cm each on blank paper with a ballpoint pen filled with the above ink, cut off the lined paper, add 1 ml of absolute ethanol, soak for 20 min, filter the resulting solution with a 0.22 μm microporous membrane, and collect the filtrate Prepare a sample solution. The prepared sample solution was directly injected into the pressurized capillary electrochromatograph for analysis, and the injection volume was controlled to be 700nl. Control analysis time 40min. The control analysis conditions are as follows: chromatographic column: a quartz capillary column packed with C 18 with a particle size of 5 μm, an inner diameter of 150 μm, a column length of 55 cm, and an effective column length of 30 cm. Mobile phase: A component: a matrix made of 5 parts by weight of acetonitrile and 95 parts by weight of water, plus 0.05% trifluoroacetic acid equivalent to th...

Embodiment 3

[0029] Ballpoint pen ink model: YJ-001-1, manufacturer: Shanghai Jiji Pen Industry Co., Ltd.

[0030] Draw 50 lines with a length of 0.5 cm each on blank paper with a ballpoint pen filled with the above ink, cut off the lined paper, add 1 ml of absolute ethanol, soak for 20 min, filter the resulting solution with a 0.22 μm microporous membrane, and collect the filtrate Prepare a sample solution. The prepared sample solution was directly injected into the pressurized capillary electrochromatograph for analysis, and the injection volume was controlled to be 700nl. Control analysis time 40min. The control analysis conditions are as follows: chromatographic column: a quartz capillary column packed with C18 with a particle size of 5 μm, an inner diameter of 150 μm, a column length of 55 cm, and an effective column length of 30 cm. Mobile phase: A component: a matrix made of 5 parts by weight of acetonitrile and 95 parts by weight of water, plus 0.05% trifluoroacetic acid equivale...

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Abstract

The invention provides an identification method used for ballpoint pen ink, which adopts a pressurized capillary electro-chromatography instrument for the identification, comprising the steps as follows: a sample solution is prepared by the ballpoint pen ink to be identified; the sampling analysis of the prepared sample solution is carried out by the pressurized capillary electro-chromatography instrument; furthermore, the obtained chromatographic peak graph is compared with the known chromatographic peak graph of the ballpoint pen ink, thus identifying the sort and type of the ballpoint pen ink to be identified, etc.; wherein, the sampling quantity is 700nl and the analysis time is 40min. The identification method of the invention uses relatively simple flow phase, and has little sample quantity, large peak capacity, stable analysis process, good preciseness and extremely good separation effect.

Description

technical field [0001] The invention relates to a substance analysis and identification method, in particular to a ballpoint pen ink identification method. Background technique [0002] Ballpoint pens have become the most commonly used writing tools for people because of their smooth writing, easy portability and bright colors. At the same time, they are also the most commonly used tools for criminals. Therefore, in various criminal, economic cases and civil disputes, the inspection and identification of handwriting, color marks, and components are often involved, especially the inspection and identification of ballpoint pen ink. So far, the inspection and identification of ballpoint pen inks are generally carried out by methods such as thin-layer chromatography, gas chromatography, and liquid chromatography. The problems of the above-mentioned identification methods are: low detection sensitivity of thin-layer chromatography and large amount of sample; gas chromatography c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/60
Inventor 阎超黎路黄晓晶李鹏申克宇
Owner UNIMICRO SHANGHAI TECH
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