| Popis: |
The aim of the study is to formulate the principles for the quantitative assessment of the content of certain metals and non-metals in expert studies of objects of biological and non-biological origin by methods of X-ray fluorescence and atomic emission spectrometry without the use of standard samples. The objects of research are samples of marijuana seized from illicit trafficking; samples of blue clay from the Undorovskoye deposit, a potential excipient in pharmaceutical technology. Examples of comparative analysis of marijuana and blue clay are considered. In samples similar in structure and chemical composition, the values of analytical signals of chemical elements were compared, and quantitative analysis was also carried out without a calibration step. These techniques make it possible to solve the question of the identity of the elemental composition of the samples. Thus, the problem of quantitative determination of the elements of some metals and non-metals in objects of biological and non-biological origin can be transformed into the problem of assessing the primary analytical signal of the determined elements. Using a formalized mathematical model, for example, the method of fundamental parameters, for the intensity of X-ray fluorescence, it is possible to establish a correspondence with the content of elements in the analyzed object. The described methodological approaches can be applied in forensic chemical, forensic and pharmaceutical analysis. |
