Potentiometric study of complexes of lead(II) with dithiocarbaminoacetic acid.
A potentiometric determination of the stability constants of lead(II)-dithiocarbaminoacetic acid complexes has been made. Potentiometric data have been used for estimating the maximum number of co-ordinated ligands. After graphical solution of the Fronaeus integral, the relationship between the concentration variables has been found, and the curve-fitting method, in which both variables are normalised, has been used for determining the stability constants. The values found are log beta(1) = 7.32 +/- 0.12 and log beta(2) = 13.03 +/- 0.20 (mu = 0.1; 25 degrees ). From these data, the relationship between the conditional stability constant logbeta(2)' and pH has been calculated, thus furnishing a full description of TCA as a masking agent for lead ions.
Budevsky
O
O
Bulgarian Academy of Sciences, Institute of General and Inorganic Chemistry, Sofia 13, Bulgaria.
Platikanova
E
E