COLLOID-CHEMICAL INTERACTIONS DURING THE CONCENTRATION OF METALS BY REVERSE MICELLES OF OXYETHYLATED SURFACTANTS - STUDY OF SOLUBILIZATION PROCESS

Solubilization of aqueous solutions of various salts and acids by reve rse micelles of Neonol AF(9)-4 was studied in systems with various com positions of aqueous and organic phases. It was found that the solubil ization capacity of micelles decreases with increasing salt concentrat ion (NaCl, Na2SO4). For the acid solutions (HCl, Na2SO4), the plots of solubilization capacity versus concentration exhibit a maximum. The s olubilization of water by reverse micelles is the same for n-heptane a nd n-hexane used as solvents, and increases in the series of saturated hydrocarbons from n-octane to n-hexadecane. The behavior of the water -Neonol AF(9)-4-decane-chloroform system was studied and the critical micellization concentration (cmc), amount of adsorption, and solubiliz ation capacity were determined at various concentrations of chloroform and surfactant. A hypothesis was verified, according to which the des olubilization of water by chloroform in extraction systems is determin ed by dehydration effects and the shift of cmc to higher concentration s.