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.
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.
Research on the Change Rule with Time of Volatile Components in Water-based Stamp Ink Imprints and Edge Diffusion Phenomenon Based on GC-MS
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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