Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China.
Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China.
Forensic Sci Int. 2020 Jun;311:110296. doi: 10.1016/j.forsciint.2020.110296. Epub 2020 Apr 18.
For the past decades, forensic chemists have made considerable efforts to develop methods capable of dating ballpoint pen ink by monitoring the loss of volatile solvents over time; however, few studies have been reported on carbon-based black gel inks. In China, carbon-based black gel pens are typically used for formal writing and signatures, such as contracts, loan receipts, testaments, and paper tests. Thus, it is imperative to analyze the age of carbon-based black gel inks for questioned document examiners in forensic casework. In this study, by employing the combination of gas chromatography with mass spectrometry (GC-MS) and GC with a flame ionization detector, a useful method for ink dating was proposed according to the dissipation of triethylene glycol from three novel carbon-based black gel inks. The ink aging curves suggested that this approach can distinguish questioned ink samples that are less than or greater than 9 months. This result could help to identify some questioned documents actually written within a month but are passed off as documents written years ago.
在过去几十年中，法医学家们付出了相当大的努力来开发能够通过监测挥发性溶剂随时间的损失来确定圆珠笔墨水年代的方法；然而，关于基于碳的黑色凝胶墨水的研究却很少。在中国，基于碳的黑色凝胶笔通常用于正式书写和签名，例如合同、贷款收据、遗嘱和纸试验。因此，对于法医案件中的有疑问的文件检验员来说，分析基于碳的黑色凝胶墨水的年代是至关重要的。在这项研究中，通过将气相色谱与质谱联用（GC-MS）和气相色谱与火焰离子化检测器联用，根据三种新型基于碳的黑色凝胶墨水中三乙二醇的消耗，提出了一种有用的墨水年代测定方法。墨水老化曲线表明，这种方法可以区分少于或多于 9 个月的有疑问的墨水样本。这一结果有助于识别一些实际上在一个月内书写的有疑问的文件，但却被冒充为多年前书写的文件。
