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| Application of UV Absorption Spectrum to Identification of Copy Papers |
| Received:October 17, 2020 |
| DOI：10.11980/j.issn.0254-508X.2021.02.005 |
| Key Words:copy paper UV absorption spectroscopy paper examination |
| Fund Project:2018年度公安部应用创新计划项目（2018YYCXLNST018）。 |
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| Abstract:In the examination of documents and trace evidence， it is necessary to test the types and identity of the paper in order to provide clues for investigation and evidence for case trial. In order to establish an economical， simple and rapid examination method of copy papers， the extraction conditions of papers were optimized as follows： the paper was immersed in boiling pure water （98℃） bath for 10 min. Then， the extracts were scanned by UV absorption spectrum， and the test data were analyzed with independent T-test. The results showed that the number， location， shape and absorption value of UV spectra of extracts from various paper samples were different under the same experimental conditions. According to this result， the paper samples from different manufacturers， brands and batches could be distinguished and classified. A new identification method was provided for the source judgment and identity comparison of copy papers， which had good reproducibility and simplicity. It could meet the requirements of grass-roots inspection departments to a certain extent. |
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