ESTIMATION OF SORPTION PROPERTIES OF BOTTOM SEDIMENTS OF THE KUYALNIK ESTUARY

Abstract

Work is sanctified to research of adsorption descriptions and basic physical and chemical properties and chemical distribution of standards of the ground sedimentations (GS) selected from a superficial layer (0-18 cm) in north part of aquatorium of the Kuyalnik estuary. The sorption of water and methanol vapor, ammonia and sulfur dioxide was determined in the static conditions. Sorption isotherms have been analyzed according to Brunauer-Emmett-Teller theory of polymolecular sorption, the monolayer capacity and the heat of sorption of water molecules and methanol in the first layer have been determined. The essential difference between the values of the specific surface, calculated by different methods (Brunauer-Emmett-Teller theory, Kiselev). The differences in their values are is natural, as for the calculations data are used to measure the sorption of water vapor at different sites of isotherms (for BET - the area at p/ps = 0,01±0,4; Kiselyov at p/ps = 0,55±0,98). Under static conditions the absorption of sulfur dioxide and the ammonia by bottom sediments samples was studied. It is shown the SO2 uptake process, flogoing predominantly through the chemisorption mechanism, occurs only in the presence of «free» water formed after the formation of the monolayer. The maximum sorption capacity on dry samples is 2,6 mg/g. The limiting ammonia sorption capacity (19,1 mg/g at P = 13,3 kPa), unlike sulfur dioxide, in our view, is mainly determined by their organic component, namely the presence in it of humic acids having polyfunctional groups, such as phenolic, hydroxyl groups, carboxylic acid groups that are capable of adsorbing, absorbing and selectively extracting various organic and inorganic substances. The dispersion, organomineral composition, biological, bactericidal activity and sorption characteristics of the samples of bottom sediments (peloids) Kuyalnik estuary in relation to a number of markers of different nature (water vapor, methanol, ammonia, sulfur dioxide) show prospects for use as a cheap natural raw material to expand the range of sorbents for environmental purposes, entero - and vulnerosorbtion (application of sorbents) for medicine, cosmetology.