DETERMINATION OF SELENIUM CONTENT IN NATURAL OBJECTS BY INSTRUMENTAL METHODS

MIIVOJ

Abstract

The research experimentally demonstrates the advantages of low-temperature methods: inversion voltammetry and molecular fluorimetry on representative samples of natural objects: river suspensions, pore waters, surface waters and bottled waters in the determination of volatile mercury-like elements. A method for the determination of selenium has been developed, in combination with the chemical preparation of an analytical sample for instrumental analysis. The most significant are low-temperature instrumental methods with liquid-phase and solid-phase concentration of a volatile element. Low-temperature methods of chemical analysis include methods based on measuring the properties of substances at low temperatures. The distinctive features of low–temperature chemical analysis methods in comparison with high-temperature methods are high sensitivity, since they are based on measuring very small changes in the properties of the system when adding an analyte – this allows you to determine even small amounts of matter in the sample; accuracy - low-temperature analysis methods usually have high accuracy, since they are based on measurements of physical properties that can be measured with high accuracy; selectivity - low–temperature methods have high selectivity; ease of use - many low–temperature methods are easy to use and do not require complex and expensive equipment.