On the issue of possible usage of carbamide tar to create artificial grounds with high sorption capacity
Lead solution filtration through model samples, prepared on the base of alluvial sand mixed with carbamide tar in proportions 1:1 and 1:2, is characterized by sorption capacity 30 mg/g of sample and 160 mg/g of sample, respectively. Direct and reverse potentiometric titration of carbamide tar by the 0,1 normal Pb(NO3)2 solution has clearly shown that this is depended on irreversible lead sorption (in this case lead cannot be extracted by buffer solutions) which take place when the carbamide tar hardens in acid conditions. Results of the IR-spectroscopic analysis let us to suppose that lead atoms are hard integrated in the polymer structure of the tar with N-Pb-N bond formation.