THERMODYNAMICS AND EXPERIMENTS RELATED TO THE BARIUM EXCHANGE OF TRACE-ELEMENTS IN SOIL SAMPLES

The mobility of trace elements in polluted soil samples is usually est imated with chemical reagents. This study aims to compare thermodynami c and experimental results, dealing with the extraction of trace eleme nts in controlled conditions (ratio m/v; selectivity of the different reactions; transfer of trace elements). Due to the good adequation of the two approaches, it may be concluded that even if constants involve d in the different equilibria are not known, thermodynamics can qualit atively explain experimental results and may be a useful tool in order to predict the mobility of trace elements.