DETERMINATION OF THE TRACKS OF CONTACT INTERACTION OF A HUMAN WITH EXPLOSIVE SUBSTANCES

Abstract

The aim of the article is to present the results of an experimental study on finding effective solvents for detecting traces of explosive substances on the human palms, to determine the factors that affect their conservation. The reliability of the obtained results and conclusions is provided by a set of general scientific and special methods of cognition in accordance with the set goal. In particular, the use of formal-logical methods (analysis, synthesis, deduction, induction, analogy, abstraction) confirms the possibility of detecting the fact of human interaction with an explosive substance (holding an explosive substance), such as TNT, proved the possibility of detecting this substance on the human palms and its removal using various solvents, identified the most effective of them (acetone, heated ethyl alcohol), presented other factors that reduce the threshold of its detection, and therefore significantly increase the possibility of detection in handwipes. There were found out the effect of TNT dispersion, the nature of the solvents, the condition of palms’ surface, the structure of the material by which TNT is removed from the skin, and the detection of TNT residues on the palms of the contacting person. The influence of external factors on the preservation of traces of TNT on the palms of the human hands is determined, first of all mechanical, the dependence of this effect on the dispersion of the explosive substance and the porosity of the surface of the material being rubbed by the hands (the larger the size of the TNT particles on the palms of the hands and the higher porosity of the surface of the material surface, the less TNT remains on the palms of the person and the more difficult to obtain positive results from its presence there). The dogmatic method clarifies the conceptual and categorical apparatus of the study, using the modeling method to formulate conclusions and some suggestions.
Keywords: wipesamples from hands; TNT; contact with explosive substance; gas-liquid chromatography; external factors; skin layer.