使用ATR-FTIR光谱和化学测量对红色口红残留物的法医调查 - - 一项全面的佩戴和储存效应研究
Arti Yadav1, Dimple Bhatia1, Chongtham Nimi1
1Department of Forensic Science, Punjabi University, Patiala, Punjab, India.
Journal of forensic sciences
|September 3, 2025
概括
使用ATR-FTIR光谱的法医唇膏分析可以在几个小时内对磨损的样本进行可靠. 然而,一年的存储大大降低了准确性,影响了证据的真实性.
科学领域:
- 法医科学
- 分析化学
背景情况:
- 在犯罪现场的口红痕迹是重要的法医证据.
- 在储存过程中样品的降解可能会损害证据的完整性.
研究的目的:
- 评估佩戴时间和储存时间对口红痕迹分析的影响.
- 为了确定衰减总反射率-里埃变换红外光谱 (ATR-FTIR) 的可靠性,用于法医口红的识别.
主要方法:
- 使用ATR-FTIR光谱分析20种红色口红品牌.
- 通过在不同时间点 (5分钟至5小时) 抽取志愿者的样本.
- 在ATR-FTIR分析之前,一组样本经过1年的老化研究.
主要成果:
- 清洁的口红样品的识别准确率为100%.
- 用过的口红样本 (第一阶段) 显示化学预测准确率为80%.
- 由于干燥和样品损失,老化样品的精度显著下降 (45%).
结论:
- 在新鲜口红痕迹分析中,ATR-FTIR光谱与化学测量相结合是有效的.
- 长期储存口红样本会对分析准确性和证据可靠性产生负面影响.
- 尽量减少储存时间对于保持法医口红证据的真实性至关重要.
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