Citation: Si-Jia LU, Zhuo XING, Rui-Qin YANG. Detection of Metal Imprints on Non-porous Surfaces[J]. Chinese Journal of Applied Chemistry, ;2021, 38(1): 116-122. doi: 10.19894/j.issn.1000-0518.200155 shu

Detection of Metal Imprints on Non-porous Surfaces

1.
School of Forensic Science, People's Public Security University of China, Beijing 100038, China
2.
School of Policing Studies, Shanghai University of Political Science and Law, Shanghai 201701, China

Corresponding author: Rui-Qin YANG, yangruiqin@ppsuc.edu.cn
Received Date: 22 May 2020
Accepted Date: 21 July 2020

Fund Project: the Innovation Personnel Training Project of People′s Public Security University of China in 2020 2020ssky006the Fund of Liu Yao Academician of Chinese Academy of Engineering 2019-YZ-01

Figures(9)

A new method of visualizing metal imprints on non-porous surfaces was studied using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol as the chromogenic reagent. The affecting factors such as contact time, time elapse from the contact to the reaction, type of substrates and transfer times were studied. The results show that imprints with good quality are obtained when the contact time is more than 1 s, the time interval is between 1~30 days and the metal imprints within 5 deposition times after the contact between hands and metal tools for 90 s. This method has the advantages of high sensitivity and easy operation and is used to establish the connection between suspects and metal tools, which has potential applications in forensic science.
- Non-porous surfaces,
- Metal imprints,
- Ion transfer,
- Forensic science
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沈阳化工大学材料科学与工程学院沈阳 110142