THE ROLE OF THIN LAYER CHROMATOGRAPHY AT CRIMINALISTIC INVESTIGATION OF OIL PRODUCTS BASED INFLAMMATORY MIXTURES

The appearance and quality of the material evidence that comes to the study, often also not conducive to the use of complex methods of analysis. There are no separate techniques for forensic investigation of incendiary mixtures, and existing approaches to the study of petroleum products and fuels and lubricants do not allow the tasks set before the experts to be fully addressed. To determine the applicability of the thin layer chromatography method and to interpret its results for the examination of incendiary mixtures, forensic modeling of incendiary incendiary incendiary mixtures was conducted. The study revealed the possibilities and limitations of thin layer chromatography in the analysis of complex compositions, including those containing polymeric thickeners. The results were interpreted for use in forensic practice. The study was performed by TLC in an octane solvent system: benzene with the detection of colored zones in UV rays, with the manifestation of iodine vapors and the processing of chromatograms of 2% formaldehyde in sulfuric acid. The results of thin-layer chromatography characterize the main constituent components and can be used in the primary study of petroleum- based ignition mixtures in expert practice. The use of UV detection of colored zones on a chromatographic plate allows to assess in more detail the nature and composition of the mixture under study, including to identify distillate and residual oil products. Thin-layer chromatography can be recommended as a mandatory method of investigation for the ignition mixtures, which precedes the use of more complex Physics and Chemistry spectral and chromatographic approaches.