选用毛细管区带电泳分离模式,对13种市售蓝色签字笔样品字迹色痕进行了分析.当电压为15 kV、柱温为25 ℃时,以0.03 mol/L四硼酸钠水溶液(外加10%(体积分数)的甲醇)为缓冲液,所有样品都可以得到良好的区分;依据紫外区检测结果,样品可以分为三大类、五小类;依据可见区检测结果,样品可以分为四类;两种分析结果相结合有助于增大不同样品之间的区分度;选择3种样品进行暗处保存老化制样,根据字迹中色料成分相对含量的变化,对字迹的相对形成时间进行了初步探讨.研究还发现纸张类型对于上述研究结果无影响.
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