【摘要】 为解决司法鉴定领域中喷墨打印文件制成时间问题，利用气相色谱-质谱联用法（GC-MS）定性定量分析4种黑色喷墨打印文件墨迹中的挥发性溶剂成分。对同一时间打印的样品进行追踪测试，每间隔一定天数用打孔器取样，提取剂提取后进行GC-MS分析。通过内标法测定样品提取液中各组分的浓度，计算单位长度（mm）墨迹中挥发性溶剂含量C(ng/mm)并作为打印样品老化的定量单位。结果表明，4种打印样品中含有2-吡咯烷酮、1,5-戊二醇、2-甲基-1,3-丙二醇、N-羟乙基-2-吡咯烷酮、甘油和三甘醇6种挥发性溶剂成分。上述成分在文件形成时即开始挥发和转移，含量不断减少至某一数值时趋于稳定。利用测定的历经不同时间的打印样本中溶剂含量数据，建立了单组分溶剂与时间的非线性回归模型以及多组分溶剂与时间的多元线性回归模型，模型评价指标比较结果表明，对于溶剂组分数多的墨水使用多元线性回归模型的预测效果更好。更多还原

【Abstract】 In order to solve the problem of formation time of inkjet printed documents in forensic field,the volatile components in four models of two brands black inkjet printed documents were quantitatively and qualitatively analyzed by gas chromatography-mass spectrometry(GC-MS). The samples printed at one certain time were tracked and tested,at regular intervals the printed samples were punched by a micro punch with a diameter of 0. 5 mm and the extract was analyzed by GC-MS. Retention time and qualitative ions combined with NIST mass spectrometry library were used for qualitative analysis and internal standard method to determine the concentration of each substance in the extract. The content of volatile solvent C(ng/mm) in the ink blot per unit length(mm) was calculated and used as a quantitative unit of aging of printed samples. The results showed that four experimental samples contained six volatile solvent components,including 2-pyrrolidone,1,5-pentanediol,2-methyl-1, 3-propylene glycol, N-hydroxyethyl-2-pyrrolidone, glycerol and triethylene glycol.These volatile components began to volatilize and transfer at the moment the printing ink was entried in the paper,and tended to stabilize. Finally,the content continued to decrease to a certain value.Based on the analysis data measured over different time period,two types of exponential functions were used to analyze the diachronic change of volatile solvents and a single component and time nonlinear regression models including S-curve, Power and Logarithm model, a multi-component and time multiple linear regression model were established to predict the formation time of printed documents and compare the effect of prediction. By comparing the evaluation indexes of the models,it was concluded that the prediction effect of the multiple linear regression model is better for the ink with more solvent sets.更多还原