[Identification of synthetic adhesives by simultaneous pyrolysis methylation gas chromatography].
At present, pyrolysis gas chromatography (Py-GC) is an effective analytical method for trace synthetic adhesives. Synthetic adhesives are usually composed of polar components. Thus, the polar pyrolysis products are normally difficult to measure by Py-GC due to their partial or complete adsorption in the pyrolysis zone, injection system or capillary column and the accuracy of results is seriously affected. Simultaneous pyrolysis methylation gas chromatography (Py-Me-GC) is a fast analytical method which was developed in recent years for polar compounds. The five synthetic adhesives have been identified by using Py-Me-GC in our study. Analytical conditions were: filament pyrolysis apparatus, flame ionization detector (FID), gas chromatograph, FFAP capillary column (30 m x 0.25 mm i.d.) and a quaternary ammonium salt as methylating agent. Major peaks of the products of pyrolysis were analysed qualitatively by GC/MS and comparisons were also made between the results by Py-Me-GC and those by Py-GC. The information gained from the components of substances by Py-Me-GC is more than that by Py-GC. The method is suitable for identifying synthetic adhesives of trace evidence in forensic science.
Li
B L
BL
College of Basic Medicine, China Medical University, Shenyang 110001, China.
Ding
J K
JK
Yan
F N
FN
Fan
C C
CC
D000269:Adhesives / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods*; D003487:Cyanoacrylates / Q000032:analysis; D008745:Methylation; D008768:Methylmethacrylates / Q000032:analysis*; D014753:Vinyl Compounds / Q000032:analysis
D000269:Adhesives; D003487:Cyanoacrylates; D008768:Methylmethacrylates; D014753:Vinyl Compounds; C040229:MK 6 cyanoacrylate; C011566:vinyl acetate