| 光谱学与光谱分析 |
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| Tri-Level Infrared Spectroscopic Identification of Hot Melting Reflective Road Marking Paint |
| LI Hao1, MA Fang2, SUN Su-qin2 |
1. Nanjing Forest Police College，Nanjing 210042，China
2. Key Laboratory of Bioorganic Phosphorus Chemistry and Chemistry Biology(Ministry of Education) ，Department of Chemistry，Tsinghua University，Beijing 100084，China |
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Abstract In order to detect the road marking paint from the trace evidence in traffic accident scene, and to differentiate their brands, we use Tri-level infrared spectroscopic identification, which employs the Fourier transform infrared spectroscopy(FTIR), the second derivative infrared spectroscopy(SD-IR), two-dimensional correlation infrared spectroscopy(2D-IR) to identify three different domestic brands of hot melting reflective road marking paints and their raw materials in formula we Selected. The experimental results show that three labels coatings in ATR and FTIR spectrograms are very similar in shape, only have different absorption peak wave numbers, they have wide and strong absorption peaks near 1 435 cm-1, and strong absorption peak near 879, 2 955, 2 919, 2 870 cm-1. After enlarging the partial areas of spectrograms and comparing them with each kind of raw material of formula spectrograms, we can distinguish them. In the region 700～970 and 1 370～1 660 cm-1 the spectrograms mainly reflect the different relative content of heavy calcium carbonate of three brands of the paints, and that of polyethylene wax(PE wax), ethylene vinyl acetate resin (EVA), dioctyl phthalate (DOP) in the region 2 800～2 960 cm-1. The SD-IR not only verify the result of the FTIR analysis, but also further expand the microcosmic differences and reflect the different relative content of quartz sand in the 512～799 cm-1 region. Within the scope of the 1 351 to 1 525 cm-1, 2D-IR have more significant differences in positions and numbers of automatically peaks. Therefore, the Tri-level infrared spectroscopic identification is a fast and effective method to distinguish the hot melting road marking paints with a gradually improvement in apparent resolution.
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Received: 2014-09-16
Accepted: 2014-12-08
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Corresponding Authors:
LI Hao
E-mail: haohaoli_ly@sina.com
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