气质联用法检验签字笔字迹中溶剂成分

GC-MS based solvent component detection in black signature pen

采用气质联用法检测了24种黑色签字笔中的溶剂成分。采用甲醇为提取溶剂,对黑色签字笔字迹中的溶剂成分进行了提取。结果表明,1,2-丙二醇和苯氧乙醇是黑色签字笔中最常见的溶剂,检测的24种样品区分率在50%左右。对1,2-丙二醇在短时间内的变化规律进行了研究,样品中1,2-丙二醇在笔迹形成后第1天变化最大,到第5天后变化趋于稳定。该研究为鉴定字迹的形成时间提供了重要的依据。

We detected solvent component in 24 kinds of black signature pens with GC-MS. We extracted solvent component in black signature pen with methanol as extraction solvent. Results show that t, 2-propanediol and phenoxyethanol are the most common solvents in black signature pen. Distinction rate is about 50% for the 24 kinds of samples. We further studied the variation rule of 1,2-propanediol in a short time. 1 ,2-propanediol changed to the maximum on the first day of handwriting formation. The variation tends to be stable on the fifth day. The research provides important evidence for the identification of handwriting formation time,