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GA/T 1701-2019: Forensic sciences - Tone identification - Infrared spectrometry
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| GA/T 1701-2019 | English | 139 |
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Forensic sciences - Tone identification - Infrared spectrometry
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GA/T 1701-2019
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Basic data | Standard ID | GA/T 1701-2019 (GA/T1701-2019) | | Description (Translated English) | Forensic sciences - Tone identification - Infrared spectrometry | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Classification of International Standard | 13.310 | | Word Count Estimation | 6,627 | | Date of Issue | 2019 | | Date of Implementation | 2019-12-01 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1701-2019: Forensic sciences - Tone identification - Infrared spectrometry---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Forensic sciences - Tone identification - Infrared spectrometry
ICS 13.310
A92
Public Safety Industry Standard of the People's Republic of China
Forensic science toner inspection infrared spectroscopy
Published on October 14,.2019
2019-12-01 Implementation
Issued by the Ministry of Public Security of the People's Republic of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Sub-Technical Committee of the National Criminal Technology Standardization Technical Committee (SAC/TC179/SC10) and
Be in charge.
This standard was drafted by. Chongqing Municipal Public Security Bureau.
The main drafters of this standard. Gao Yonglun, Zhao Liang, Du Wanghong.
Forensic science toner inspection infrared spectroscopy
1 Scope
This standard stipulates that infrared spectroscopy in the field of forensic science examines electrostatic copiers, laser printers, and other methods of electrostatic development.
Specification for inspection of ink-forming toner.
This standard is applicable to the infrared spectroscopy inspection of ink toner formed by electrostatic development in the field of forensic science.
2 Principle
The main components of xerographic toner, laser printing toner and other toners are carbon black, pigment, dye, hot melt resin, paraffin and others
The fine powder composition of the carrier and the additives, the difference of the toner components can be reflected by the infrared spectrum.
3 Reagents and testing equipment
3.1 Reagents. Spectral pure potassium bromide, chloroform.
3.2 Equipment and parameters.
a) Fourier transform infrared spectrometer.
1) Number of scans. 40;
2) Resolution. 4cm-1;
3) Detector. standard detector;
4) Scanning range. 400cm-1~4000cm-1.
b) Blade.
c) Infrared film-making hydraulic device.
4 Operation steps
4.1 Select writing in different parts of the document (more than 3), and scrape the writing toner with a blade.
4.2 Take an appropriate amount of chloroform for extraction, shake and dissolve completely, let stand, and filter.
4.3 Place the filtrate in the agate grindstone and dry it under infrared light.
4.4 The sample and potassium bromide are mixed in an appropriate ratio, fully grinded, and tableted with a tableting hydraulic device to make a transparent potassium bromide tablet.
4.5 Put the potassium bromide tablet into the infrared spectrometer for testing.
5 Expression of results
5.1 If the characteristic absorption peaks of the infrared spectrum of the test material and the sample are the same, it can be concluded that the outer spectrum of the test material and the sample ink pink is not
Significant differences were detected.
5.2 If the characteristic absorption peaks of the infrared spectrum of the test material and the sample are different, you can get an opinion. the detection material and the toner composition of the sample are detected
difference.
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