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Anal Bioanal Chem. 2019 Mar 16. doi: 10.1007/s00216-019-01718-0. [Epub ahead of print]

Elemental analysis and imaging of sunscreen fingermarks by X-ray fluorescence.

Author information

1
CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
2
University of Chinese Academy of Sciences, Beijing, 100049, China.
3
Institute of Forensic Science, Ministry of Public Security, Beijing, 100038, China.
4
Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, China.
5
Institute of Health Sciences, Anhui University, Hefei, 230039, China.
6
Bruker Scientific Technology Co. Ltd, Shanghai, 200233, China.
7
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
8
CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China. wangmeng@ihep.ac.cn.

Abstract

Chemical composition in fingermarks could provide useful information for forensic studies and applications. Here, we evaluate the feasibility of analysis and imaging of fingermarks via elements by synchrotron radiation X-ray fluorescence (SRXRF) and commercial X-ray fluorescence (XRF). As a proof of concept, we chose four brands of sunscreens to make fingermarks on different substrates, including plastic film, glass, paper, and silicon wafer. We obtained an evident image of fingermarks via zinc and titanium by XRF methods. In addition, the ratios of element concentrations in sunscreen fingermarks were obtained, which were in accordance with the results obtained by acid digestion and ICP-OES analysis. In comparison, commercial XRF offers the most advantages in terms of non-destructive detection, easy accessibility, fast element images, and broad applicability. The possibility to acquire fingermark images simultaneously with element information opens up new avenues for forensic science. Graphical abstract.

KEYWORDS:

Elemental imaging; Fingermark; Synchrotron radiation X-ray fluorescence; X-ray fluorescence

PMID:
30879112
DOI:
10.1007/s00216-019-01718-0

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