中国刑事警察学院 刑事科学技术学院,辽宁 沈阳 110035
赵鹏程,博士,教授,研究方向:法庭科学微量物证检验,E-mail:zhaopengcheng@cipuc.edu.cn
收稿:2025-05-17,
修回:2025-06-06,
网络出版:2025-07-10,
纸质出版:2025-12-15
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张祉悦,赵鹏程,叶祯,崔岚,宋辉.基于GC-MS研究水性印油印痕中挥发组分历时性变化规律及边缘扩散现象[J].分析测试学报,2025,44(12):2607-2613.
ZHANG Zhi-yue,ZHAO Peng-cheng,YE Zhen,CUI Lan,SONG Hui.Research on the Change Rule with Time of Volatile Components in Water-based Stamp Ink Imprints and Edge Diffusion Phenomenon Based on GC-MS[J].Journal of Instrumental Analysis,2025,44(12):2607-2613.
张祉悦,赵鹏程,叶祯,崔岚,宋辉.基于GC-MS研究水性印油印痕中挥发组分历时性变化规律及边缘扩散现象[J].分析测试学报,2025,44(12):2607-2613. DOI: 10.12452/j.fxcsxb.250517364.
ZHANG Zhi-yue,ZHAO Peng-cheng,YE Zhen,CUI Lan,SONG Hui.Research on the Change Rule with Time of Volatile Components in Water-based Stamp Ink Imprints and Edge Diffusion Phenomenon Based on GC-MS[J].Journal of Instrumental Analysis,2025,44(12):2607-2613. DOI: 10.12452/j.fxcsxb.250517364.
采用气相色谱-质谱联用技术(GC-MS)对5种水性印油印痕及其边缘外1 mm处的挥发性溶剂组分进行定性定量分析。通过周期性追踪测试,利用内标法测定样品中挥发组分的含量,计算单位长度印痕的挥发性溶剂含量。5种印油印痕样品中以甘油、三甘醇为主要挥发组分,根据定量分析数据绘制了挥发成分含量的历时性变化曲线。曲线显示:印痕区域的挥发组分含量随盖印时间延长先衰减后趋于稳定,甘油的拐点出现于第7个月,稳定含量约20 ng/mm,三甘醇则于第9个月达到拐点,稳定含量约12 ng/mm;距离印痕边缘1 mm处的挥发组分含量呈现先快速增加后缓慢减少的动态特征,甘油和三甘醇的峰值含量分别出现在30 d(约25 ng/mm)和60 d(约16 ng/mm),最终分别稳定于约4 ng/mm和2 ng/mm。研究进一步揭示了印痕中甘油、三甘醇的历时性变化规律,初步总结了其在印痕外边缘的扩散规律,推断了影响挥发组分边缘扩散现象的各类因素,为印痕形成时间的科学判定及边缘扩散干扰校正提供了实验依据。
In order to investigate the identification of seal stamping time in court science,this study used gas chromatography-mass spectrometry(GC-MS) to qualitatively and quantitatively analyze the volatile solvent fractions in the imprints of five types of water-based stamp inks and 1 mm outside their edges. The volatile solvent content(
C
,ng/mm) per unit length of the imprints was calculated by periodic tracking test,and the content of volatile components in the samples was determined by the internal standard method. Glycerol and triethylene glycol were the main volatile components in the five kinds of stamp ink imprints,and a time curve of the volatile components was plotted on the basis of the q
uantitative data. The curve showed that the volatile component content in the stamped area firstly declined and then stabilized with the extension of stamping time,and the inflection point of glycerol appeared in the 7th month,with a stabilized content of about 20 ng/mm,while that of triethylene glycol reached the inflection point in the 9th month,with a stabilized content of about 12 ng/mm;the content of volatile components in the region of 1 mm away from the edge of the stamped area showed the dynamic characteristics of firstly increasing rapidly and then decreasing slowly,and the peak content of glycerol and triethylene glycol appeared in 30 days(about 25 ng/mm) and 60 days (about 16 ng/mm),and finally stabilized at about 4 ng/mm and 2 ng/mm. The study further reveals the change rule with time of glycerol and triethylene glycol in the imprint,and initially summarizes the diffusion rule at the outer edge of the imprint,and analyzes and deduces the factors affecting the edge diffusion phenomenon of the volatile components in the study,which provides an experimental basis for the scientific determination of the formation time of the imprint and the correction of the edge diffusion interference.
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