CHANGES IN THE GRANULOMETRIC COMPOSITION OF THE SOIL DUE TO ACIDIFICATION DURING THE PRODUCTION OF REFERENCE MATERIALS OF MICROELEMENTS-METALS

Abstract

Purpose. To investigate the influence of nitrate salts, elements such as cobalt, copper, manganese and zinc on the accumulation of these elements-metals in the soil and whether its granulometric composition changes during the procedure of preparing a standard soil sample with a known content of trace elements-metals by the additive method. Object. Soil material for the production of reference materials of the composition (content of trace elementsmetals) of a typical heavy loamy chernozem (surface layer 0–30 cm) selected from one of the control plots of the experimental field of the SE “DG “Grakivske”” National Scientific Centre “Institute for Soil Science and Agriculture Researches n. a. O.N. Sokolovsky”. Methods. Laboratory research methods. Preparation reference materials of a soil according to DSTU-N ISO Guide 35:2018 by the method of additives. To determine the granulometric composition of the soil, the pipette method was used as modified by A.N. Kachynsky DSTU 4730:2007. To determine the content of trace elements-metals, the method of atomic absorption spectrophotometry was used on the SATURN-4 device (manufactured by Ukraine) according to DSTU 4770.1,2,5,6:2007. Results. It has been established that acidification of the soil with nitrate salts, such elements as cobalt, copper, manganese and zinc affects the accumulation of these metal elements in the soil. A change in its granulometric composition is observed during the procedure of preparation of reference materials of soil with a known content of microelements-metals by the additive method. Findings. It has been established that it is possible to use nitrate salts in the preparation of soil material for the production of reference materials with a known content of trace metal elements by the additive method. This is confirmed by the increase of Co – 1.6 times, Su – 7.9 times, Mn – 2.22 times, Zn – 100.4 times. A methodical approach has been created regarding the procedure for preparing reference materials of soil with a known content of microelements-metals by the addition method. It was established that the use of salts affects the change in particle size composition during the procedure of preparing a reference materials with a known content of trace elements-metals by the additive method.