摘要
目的 建立一种稳定的双溶剂提取圆珠笔油墨的实验体系，达到相对准确判断圆珠笔字迹书写时间的目的。方法 依次用弱溶剂（氯苯）、强溶剂（N-N二甲基甲酰胺）溶解提取纸张上的圆珠笔油墨，点样在硅胶板上，薄层扫描得到吸收峰高值，而后根据吸收峰高值测算其相对提取率和标准偏差。结果 找到了弱溶剂量10μl、取样量10～15片、弱溶剂溶解时间60s以及强溶剂量10μl的最佳实验条件。结论 优化了双溶剂提取法，提高了该方法在检验鉴定中的准确度和可靠性。
Objective The paper is to set a steady experimental system for double-solvent extraction, then achieve the goal of estimate the writing-time of ball pen inks. Methods Weak solvent（chlorlbenzene） and powerful solvent（N-N dimethyl foramide） were used to extract ball pen inks on the paper, then drop the fluid extracted in the silica gel board, get the absorb peak using thin layer chromatography scanning instrument. According the absorb peak, calculate relative extraction-rate and standard deviation. Resluts Get optimum experimental conditions, the volume of weak solvent is 10μl; the quantity of sample is 10-15 ink spots; the time of weak solvent dissolution is 60s and the volume of powerful solvent is 10μl. Conclusion The paper optimize the method of double-solvent extraction, furthermore improve the accuracy and reliability of the method.
出处
《刑事技术》
2006年第5期23-26,共4页
Forensic Science and Technology
