DISTRIBUTION OF EUROPIUM BETWEEN GELS AND SOLUTION OF IRON(III) FULVATE AT PH 1-9

The method was developed allowing quantitative extraction of fulvic ac ids from soil samples in the form close to native. Formation of gel-li ke and soluble forms of iron(III) fulvates in the systems containing e quivalent amounts of iron(III) and fulvic acid was studied within pH r ange 1-9. The molecular structure of fulvates and the mechanism of tra nsformation of gel to soluble forms was analyzed by IR spectroscopy. D istribution of microamounts of europium between gel-like iron fulvates and their solutions was studied. The correlation between phase distri bution of europium and solubilization of iron(III) fulvates was analyz ed.