GB/T 19267.7-2023Forensic sciences—Physical and chemical examination of trace evidence—Part 7: Gas chromatography-mass spectrometry (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1. Structure and Drafting Rules of Standardization Documents" Drafting.

This document is Part 7 of GB/T 19267. GB/T 19267 has released the following parts.

---Part 1. Infrared absorption spectrometry;

---Part 2. UV-visible absorption spectrometry;

---Part 3. Molecular fluorescence spectrometry;

---Part 4. Atomic emission spectrometry;

---Part 5. Atomic absorption spectrometry;

---Part 6. Scanning electron microscopy/X-ray spectroscopy;

---Part 7. Gas Chromatography-Mass Spectrometry;

---Part 8. Microspectrophotometry;

---Part 9. Thin layer chromatography;

---Part 10. Gas Chromatography;

---Part 11. High performance liquid chromatography;

---Part 12. Thermal analysis method.

This document replaces GB/T 19267.7-2008 "Physical and chemical examination of criminal technical trace evidence - Part 7. Gas chromatography-mass spectrometry", Compared with GB/T 19267.7-2008, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

---Changed the applicable field, changing "criminal technology" to "forensic science" (see Chapter 1, Chapter 1 of the 2008 edition);

---Added GB/T 13966 "Terminology for Analytical Instruments" and GA/T 242 "Terminology for Physical and Chemical Testing of Trace Evidence in Forensic Science" Normative references (see Chapter 3);

---Added the term "secondary mass spectrometry" (see 3.4);

---Changed the terms of "gas chromatography-mass spectrometry", "gas chromatography-mass spectrometry", "total ion chromatogram" and "ion relative abundance" Terms and/or definitions (see 3.1~3.3, 3.5, 3.3, 3.4, 3.11, 3.25 of the 2008 edition);

---Deleted some terms (see 3.1, 3.2, 3.5~3.10, 3.12~3.24 of the 2008 edition);

---Changed the "principle" (see Chapter 4, Chapter 4 of the 2008 edition);

---Added "instrument configuration" (see Chapter 5) and deleted "instrument composition" (see 5.1 of the 2008 edition);

---Added "Performance indicators of gas chromatography part" (see 6.1);

---Changed the "Performance Indicators of the Mass Spectrometry Part" (see 6.2, 5.2 of the 2008 version);

---Added relevant content on "sampling" technology (see 7.1.2);

---Changed the relevant contents of "carrier gas", "sampling mode", "column flow", "injection volume" and "gas chromatography column" (see 7.1.1, 7.1.3~ 7.1.5, 7.2, 7.3, 7.4.1.1, 7.4.1.3, 7.4.1.4, 7.2 of the 2008 version);

---Deleted "other injection ports" and "sampling pre-treatment" (see 7.4.1.2 and 7.4.1.5 of the 2008 edition);

---Changed the relevant contents of "Instrument Tuning and Calibration", "Full Scan Mode" and "Selected Ion Detection Mode" (see 8.1, 8.2.1, 8.2.2, 5.3, 7.4.2.1, 7.4.2.2 of the 2008 version);

---Added "multiple reaction monitoring (MRM) mode" and "ion trap multi-stage mass spectrometry (MSn) mode" (see 8.2.3, 8.2.4);

---Changed the relevant contents of "Environmental Conditions" and "Sample Processing" (see 9.1, 9.3, 7.1, 6.3 of the 2008 version);

---Deleted "requirements for inspection materials" and "handling of inspection materials" (see 6.1 and 6.2 of the 2008 edition);

---Added "comparison confirmation of target compounds" and "comparison test" (see 10.1.1, 10.1.3);

---Changed the relevant content of "Quantitative Analysis" (see 10.2, 7.4.3 of the 2008 version);

---Deleted "qualitative accuracy and quantitative error" (see Chapter 8 of the 2008 edition);

---Changed the relevant content of "result expression" (see Chapter 11, Chapter 9 of the 2008 edition).

Introduction

GB/T 19267 is a professional basic standard for forensic scientific trace evidence examination, aiming to improve the quality of identification and unify identification results.

Discussion, increase the credibility of identification opinions, and provide norms and guidance for forensic scientific trace evidence examination.

GB/T 19267 is planned to consist of 12 parts.

---Part 1. Infrared absorption spectrometry.

---Part 2. UV-visible absorption spectrometry.

---Part 3. Molecular fluorescence spectrometry.

---Part 4. Atomic emission spectrometry.

---Part 5. Atomic absorption spectrometry.

---Part 6. Scanning electron microscopy/X-ray spectroscopy.

---Part 7. Gas Chromatography-Mass Spectrometry.

---Part 8. Microspectrophotometry.

---Part 9. Thin layer chromatography.

---Part 10. Gas Chromatography.

---Part 11. High performance liquid chromatography.

---Part 12. Thermal analysis method.

This document is Part 7 of GB/T 19267. It describes the overall principles and basic principles of gas chromatography-mass spectrometry in the examination of trace evidence.

The requirements are generally applicable to the physical and chemical examination of trace evidence, and will play an important role in the examination of trace evidence in various cases such as explosions, arson, and gun-related cases.

It is used for the standardization and normalization construction of forensic scientific trace evidence examination, improve the quality of identification, unify identification conclusions, and increase the validity of identification opinions.

Credibility is important. It has been more than 13 years since the last version of GB/T 19267.7 was released. With the gas chromatography of trace evidence in forensic science- With the development of mass spectrometry testing technology, the content of this standard is no longer applicable to new analytical technologies and methods, and there is also a lack of specific pre-treatment methods for test materials.

It is not practical in terms of practicality, identification and expression of results, and needs to be revised and improved urgently. Therefore, this document will be officially launched again in 2021. Revision.

1 Scope

This document describes gas chromatography-mass spectrometry testing methods for forensic science trace evidence examination.

This document is applicable to the physical and chemical examination of trace evidence in the field of forensic science.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 13966 Analytical Instrument Terminology

GB/T 14666 Analytical Chemistry Terminology

GA/T 242 Terminology for physical and chemical examination of trace evidence in forensic science

3 Terms and definitions

The terms and definitions defined in GB/T 13966, GB/T 14666, GA/T 242 and the following apply to this document.