红色圆珠笔油墨分类的研究

发布时间：2018-04-01 05:40

本文选题：法庭科学　切入点：红色圆珠笔油墨　出处：《首都师范大学》2008年硕士论文

【摘要】： 随着社会经济的快速发展,法庭科学和刑侦领域涉及文档真伪鉴定的案件呈逐年增加的趋势,对圆珠笔字迹种类和书写时间的鉴定一直是法庭科学中的难题。由于油墨组成成分的多样性和测定的干扰性,更对油墨的分类和老化的研究增加了挑战。我们结合5种仪器方法对市售的54支红色圆珠笔进行了综合考察。首先,介绍了油墨分析、鉴定的研究进展,综述了近年来国内外对可疑文件的种类鉴定和书写时间鉴定的发展和应用,介绍了常用的仪器分析方法,包括:薄层色谱法、气相色谱法、液相色谱法、毛细管电泳法和液质联用技术,并对圆珠笔的发展史、原理及结构、分类和油墨的成分进行了阐述。其次,通过紫外可见分光光度法、电化学方法、薄层色谱法、高效液相色谱法和液质联用法对样品笔进行测定,并选择了最佳的实验条件。由于高效液相色谱法具有很高的灵敏度和分辨率,我们根据液相中350nm和528nm波长下出峰的个数、峰的保留时间和最大吸收波长的不同将红色圆珠笔分为六大类,每一类都结合其他的四种方法进行综合分析。五种仪器分析方法的检出信号之间存在着一一对应关系。为以后结合多种方法对红色圆珠笔的分析鉴定奠定了基础。最后,还对其他的分类方法进行了研究。在液相色谱更低的波段,出峰更多,样品笔之间的区别更明显。我们选择254nm波长下检测,用分级流程图可以将属于一大类的笔进一步细分。我们还根据不同厂家不同品牌的笔所添加的油墨染料的配比的不同,对红色圆珠笔进一步分类。
[Abstract]:With the rapid development of social economy, the number of cases in the field of forensic science and criminal investigation involving document authenticity is increasing year by year. The identification of the type of writing and writing time of ballpoint pen has been a difficult problem in court science.Because of the diversity of ink composition and the interference of determination, the classification and aging of ink are more challenging.Combined with 5 kinds of instruments, 54 red ballpoint pens sold on the market were investigated.Firstly, the paper introduces the research progress of ink analysis and identification, summarizes the development and application of classification identification and writing time identification of suspicious documents at home and abroad in recent years, introduces the commonly used instrument analysis methods, including: thin layer chromatography,Gas chromatography, liquid chromatography, capillary electrophoresis and liquid-mass spectrometry were used to describe the history, principle and structure, classification and composition of ink of ballpoint pen.Secondly, the sample pen was determined by UV-Vis spectrophotometry, electrochemical method, thin-layer chromatography, high performance liquid chromatography and liquid-quality spectrometry, and the optimum experimental conditions were selected.Due to the high sensitivity and resolution of HPLC, red ballpoint pens are divided into six categories according to the number of peaks in liquid phase at 350nm and 528nm wavelengths, the retention time of peaks and the maximum absorption wavelengths.Each class is integrated with the other four methods for comprehensive analysis.There is a one-to-one correspondence between the detected signals of the five instrument analysis methods.It lays a foundation for the analysis and identification of red ballpoint pen with various methods.Finally, other classification methods are also studied.In the lower band of liquid chromatography, there are more peaks and the difference between the sample pens is more obvious.We select the 254nm wavelength detection and use the hierarchical flow chart to further subdivide the pens which belong to a large category.We further classify the red ballpoint pen according to the different proportion of ink dye added by different brands of pen.
【学位授予单位】：首都师范大学
【学位级别】：硕士
【学位授予年份】：2008
【分类号】：D918.92

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