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Forensic sciences - Examination methods for projectiles and soldering tin - Differential scanning calorimetry(DSC)
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Basic data
| Standard ID | GA/T 2077-2023 (GA/T2077-2023) |
| Description (Translated English) | Forensic sciences - Examination methods for projectiles and soldering tin - Differential scanning calorimetry(DSC) |
| Sector / Industry | Public Security (Police) Industry Standard (Recommended) |
| Classification of Chinese Standard | A92 |
| Classification of International Standard | 13.310 |
| Word Count Estimation | 8,899 |
| Date of Issue | 2023-03-01 |
| Date of Implementation | 2023-12-01 |
| Issuing agency(ies) | Ministry of Public Security |
GA/T 2077-2023: Forensic sciences - Examination methods for projectiles and soldering tin - Differential scanning calorimetry(DSC)
---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.
ICS 13.310
CCSA92
Public safety industry standards of the People's Republic of China
Forensic Science Projectile and Solder Inspection
Differential Scanning Calorimetry
Published on 2023-03-01
Implemented on 2023-12-01
Released by the Ministry of Public Security of the People's Republic of China
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.
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is submitted by the Criminal Investigation Bureau of the Ministry of Public Security.
This document is under the jurisdiction of the Physical and Chemical Inspection Sub-Technical Committee of the National Technical Committee for Standardization of Criminal Technology (SAC/TC179/SC4).
This document was drafted by. Ministry of Public Security Identification Center, Beijing Municipal Public Security Bureau Judicial Identification Center, China Criminal Police College.
The main drafters of this document. Guo Hongling, Zhu Jun, Wang Ping, Liu Huijuan, Zhao Pengcheng, Wu Yanyan, and Li Hongda.
Forensic Science Projectile and Solder Inspection
Differential Scanning Calorimetry
1 Scope
This document specifies the analytical methods and basic requirements for differential scanning calorimeter testing of projectiles and solder in the field of forensic science.
This document is applicable to the thermodynamic parameter analysis and comparative inspection of projectiles and solders in the field of forensic science, and can also be referenced in other fields.
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 19267.12 Physical and chemical examination of criminal technical trace evidence Part 12.Thermal analysis method
GB/T 19466.1 Differential Scanning Calorimetry (DSC) for Plastics Part 1.General Principles
GB/T 19466.3 Differential Scanning Calorimetry (DSC) for Plastics Part 3.Determination of Melting and Crystallization Temperatures and Enthalpies
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 19267.12, GB/T 19466.1, GB/T 19466.3 and GA/T 242 apply to this document.
4 Principles
Common projectiles are alloys of lead and antimony in different proportions, and solders are usually alloys of tin and lead in different proportions. Different shot and solder due to
Different proportions of alloying elements have different melting temperatures and crystallization temperatures, and the changes in heat enthalpy during melting and crystallization are also different. Differential Scanning Calorimetry
By measuring the change of the heat flow rate difference input to the sample and the reference sample with temperature or time under the specified atmosphere and program temperature control, the actual
Measurement of thermodynamic parameters such as melting temperature, crystallization temperature, enthalpy change of samples and comparison inspection between samples.
5 Reagents and materials
Reagents and materials are as follows.
a) Indium or tin standard sample;
b) High purity nitrogen (N2);
c) Aluminum sample dish (with lid);
d) Absolute alcohol absorbent cotton balls;
e) Absolute ethanol (C2H5OH, analytical grade);
f) scalpel;
g) Tweezers;
h) Gloves.
...
