The aim of research is experimental modeling of arsenic, copper, and lead ions interaction with humic acids (HAs). Importance of that study and choice of study subjects is caused by poor knowledge of kinetic properties of heavy metals and humic substances interaction. Those elements are, on the one hand, common pollutants accumulated in soils under anthropogenic impact, and on the other hand - satellite elements for gold deposits, which are used as indicators of gold mineralization in geochemical survey. The experiment was carried out in the range of heavy metals concentrations from 5 to 100 μg/cm 3in solution and at temperature of 298 K. The equilibrium concentrations of the elements were determined by inductively coupled plasma mass spectrometry. The experimental adsorption isotherms are described with the empirical Freundlich equation and the Langmuir monomolecular adsorption model. It was shown that the Langmuir model adequately describes the adsorption isotherms of Cu 2+and Pb 2+cations in the used concentration range. The sorption equilibrium constant and the limit adsorption were calculated for these elements. The sorption of arsenic is better described with the Freundich equation. Apparently, it is characterized by complex character of sorption interactions associated with a possible polymolecular adsorption mechanism, as well as with the change of form of arsenic in solution. A simulation experiment of influence of Fe3+ ions onto the sorption of gold ions was conducted, which is important for determination of gold's migration forms in soils with presence of iron oxides and hydroxides. It was shown that the increase of iron concentration had almost no effect on the amount of sorbed gold ions in the studied concentration range.
|Translated title of the contribution||Sorption interaction of gold and its pathfinder elements with humic acids of peat-podzolic soils|
|Number of pages||6|
|Journal||ТЕОРЕТИЧЕСКАЯ И ПРИКЛАДНАЯ ЭКОЛОГИЯ|
|Publication status||Published - 2020|
Scopus subject areas
- Ecology, Evolution, Behavior and Systematics