CRIMINALISTICS RESEARCH OF SEMISYNTHETIC MOTOR OILS OF FOREING AND DOMESTIC PRODUCTION


  • V. A. Rudniev
  • A. F. Klimchuk
  • L. V. Nardid
  • O. D. Bui
  • D. M. Dziubak
Keywords: semisynthetic motor oils, thin-layer chromatography, IR-spectroscopy

Abstract

Characteristics of engine oils exterior in spectrum UV region, solubility parametres are determined. By results of research it’s established that all types of the investigated engine oils are characterized by similar colour characteristics, ability to solubility in liquids of various nature and polarity. The results of researches of structurally-group composition of some semisynthetic oils offoreign and domestic production with the use of methods of thin-layer chromatography and IR-spectroscopy are presented. The use of IR-spectroscopy method gives the basic information on the structure of investigated objects under condition of registration of corresponding absorption bands, and also makes it possible to detect the presence ofadditives ofantioxidant, dispersive and viscous purpose. An obstacle for reliable interpretation of IR spectra at an establishment of oil concrete type (mineral, semisynthetic or synthetic) is the presence of common intensive absorption bands, and also imposing of more intensive bands on less intensive (masking). Efficiency of this method use for an establishment of oil type is situational. It depends on composition which is defined by the manufacturer. In order to obtain more informative IR spectra we may recommend a classical method of registration - using liquid cuvettes or in a thin layer between the plates made from KBr. The use of the thin-layer chromatography method has shown possibility of semisynthetic oils differentiation from mineral and synthetic oils under condition of complex processing of chromatograms with the Marki reactant, iodine vapors and examination in UV-beams. It’s ascertained that received chromatograms of semisynthetic oils have an overall separation pattern with motor and synthetic oils. At that chromatograms of mineral and synthetic oils essentially differfrom each other. Thus, attributing oils to semisynthetic becomes possible when obtaining a chromatographic separation pattern in a thin layer of a sorbent at set of signs characteristic both for mineral and for synthetic oils.


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Published
2017-11-29
How to Cite
Rudniev, V. A., Klimchuk, A. F., Nardid, L. V., Bui, O. D., & Dziubak, D. M. (2017). CRIMINALISTICS RESEARCH OF SEMISYNTHETIC MOTOR OILS OF FOREING AND DOMESTIC PRODUCTION. Theory and Practice of Forensic Science and Criminalistics, 17, 266-274. https://doi.org/10.32353/khrife.2017.33
Section
FORENSIC EXAMINATION OF MATERIALS, SUBSTANCES AND PRODUCTS: METHODICAL APPROACHE