核磁共振氢谱法鉴定油性圆珠笔文书的书写时间

Dating Oily Ballpoint Pen Hand-Writings by 1H NMR Spectroscopy

油性圆珠笔文书书写时间的鉴定是司法鉴定工作中的热点.该文采用核磁共振氢谱法（^1H NMR）对所购6种不同型号油性圆珠笔的油墨进行了表征,研究了圆珠笔油墨中的溶剂——苯氧基乙醇在文书老化过程中的变化,并建立了MG-115书写文书的自然老化标准曲线.该标准曲线能够准确鉴定MG-115圆珠笔4个月内的文书书写时间,重现性良好;同时,该文探究了人工老化与自然老化的关系,为文书书写时间的鉴定提供了依据.

Dating ballpoint pen hand-writings is a hot topic in forensic science. It remains untested whether NMR spectroscopy is suitable for this task. In this study, six types of oily ballpoint pen ink were characterized by 1H NMR spectroscopy. The same method was also used to measure the changes of 2-phenoxyethanol content in oily ballpoint pen hand-writings with aging. A standard curve was established based on the experimental results. It was demonstrated that, as long as the brand of the oily ballpoint pen used was known, hand-writings made within 4 months could be dated precisely. The effects of artificial aging and natural aging were compared subsequently. It was found that ten minutes in ultraviolet aging box corresponded to approximately one day of natural aging.