Methodical approaches to creation of standard samples of soil material with known content of microelementsmetals

Abstract

The purpose. To analyze modern requirements to soil material for creation of standard samples of soil with the known content of microelements-metals, to establish features of procedure of manufacturing samples and to offer possible ways of their realization. Methods. Theoretical and comparative-analytical methods are used for substantiation of methodical approaches to preparation and certification of material of standard samples of soil structure, laboratory — for working out procedure of preparation of soil material for creation of standard samples of soil as to content of microelements-metals, methods of mathematical statistics — for processing experimental data. Results. Methodical approaches are analyzed to metrologically correct procedure of manufacturing soil material with the known content of microelements-metals (spiked samples). Owing to impossibility to provide the accepted accuracy and reliability of results of measurements of the content of mobile connections of microelements in soils with their background content, necessity of application of the method of additives with obligatory maintenance of commutability of material is proved. Conclusions. By development and realization of procedure of manufacturing standard samples certified on mass fraction of microelements, it is necessary to consider extremely high heterogeneity of soil material, usually low mass fraction of microelements-metals and other features which can complicate establishment of certified values of their mass fractions. Metrologically correct procedure of preparation of soil material should consider and minimize reasons of occurrence of errors of results of measurements so that standard samples to the greatest degree meet special-purpose designation.