Polarographic and Spectrophotometric Study of Lead Complexes with Diethanoldithiocarbamate

experimental and theoretical aspects concerning the behaviour of lead-dietanoldithiocarbamate complexes in aqueous solutions were studied. the reaction occurs through complexation and formation of a yellow precipitate, which is soluble in ligand excess and in some polar solvents. the results from elementary and gravimetric analyses show a stoichiometric relationship of 1:2 (pb(ii): dedc). some ambiguous interpretations have been clarified on the application in this system of lingane？s equation. polarographic measurements were used to determine the coordination number (@ 3.0) and overall formation constant bmln (@ 4 x 1016), of the lead complexes with ammonium diethanoldithiocarbamate, which show a good agreement with previous potentiometric results for the same system. a kinetic-spectrophotometric study was carried out in order to establish the decomposition of these complexes in acid medium.