GB/T 19267.1-2023 in English
VALIDForensic sciences—Physical and chemical examination of trace evidence—Part 1: Infrared absorption spectrometry
- Issued on:2023-11-27
- Implemented on:2024-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$262.00
《GB/T 19267.1-2023法庭科学 微量物证的理化检验 第1部分：红外吸收光谱法》由TC179（全国刑事技术标准化技术委员会）归口，TC179SC4（全国刑事技术标准化技术委员会理化检验分会）执行，主管部门为公安部。
Introduction
1. Standard Overview
GB/T 19267.1-2023 "Physical and Chemical Examination of Trace Evidence in Forensic Science Part 1: Infrared Absorption Spectroscopy" is an important standard for the physical and chemical examination of trace evidence in forensic science research. This revision mainly updates and improves the terminology, instrument configuration and detection methods to adapt to technological progress and practical needs.
2. Comparison of standard frameworks
| Standard version | Scope of application | Main changes |
|---|---|---|
| GB/T 19267.1—2008 | Physical and chemical examination of trace evidence in criminal technology | - Limited number of terms- Single detection method |
| GB/T 19267.1—2023 | Physical and chemical examination of trace evidence in forensic science | + New terms: baseline, high-pressure diamond cell+ Updated detection technology: attenuated total reflection method, diffuse reflection method, etc.+ Expanded scope of application: applicable to more types of test materials |
3. Analysis of standard formulation background and technological evolution
With the increasing requirements for trace evidence testing technology in the field of forensic science, the original standard can no longer fully meet the practical needs. This revision aims to:
- Update the detection technology to adapt to the development of new technologies;
- Expand the scope of application to cover more types of test materials;
- Improve the standardization and accuracy of the result expression.
4. Interpretation of the core content of the standard
4.1 Terminology update
New terms include:
- Baseline: The curve on the absorption spectrum that represents the background absorption.
- High-pressure diamond cell: A device used to prepare samples under high pressure to measure infrared spectra.
4.2 Instrument configuration and performance requirements
The new standard puts forward higher requirements on the technical parameters of the instrument's beam splitter and detector, including:
| Instrument components | Technical indicators |
|---|---|
| Beam splitter | - Use range: 25000~3300 cm⁻¹ to 400~10 cm⁻¹ - Carrier type: SiO₂, CaF₂, KBr, etc. |
| Detector | - Operating temperature: 295K and below - Detection rate range: 1.8×10⁹ to 2×10¹¹ |
4.3 Sample preparation method
The new standard introduces a variety of sample preparation techniques:
- Pellet method: Applicable to powdered samples.
- Thin film method: Applicable to thermoplastic polymer samples.
- High-pressure diamond cell method: An efficient preparation method for trace samples.
4.4 Test steps and result analysis
The test process includes:
- Control of experimental environment conditions;
- Sample preparation and testing;
- Data processing and result analysis.
5. Implementation Suggestions
To ensure the effective implementation of the standard, it is recommended to:
- Strengthen the professional training of testing personnel;
- Equip with instruments and equipment that meet the requirements of the new standard;
- Establish standardized operating procedures and quality control systems.
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
