POLYNUCLEAR COMPLEX FORMATION BETWEEN LEAD(II) AND 2-MERCAPTOETHANOL AND 3-MERCAPTO-1,2-PROPANEDIOL

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Abstract
The complex formation between Pb(II) and 2-mercaptoethanol (MEL) and 3-mercapto-1,2-propanediol (MPD) was studied by a pH-metrical method at 25°C and in 0.5 M KNO3. The system Pb(II)/MEL can be represented by the formation of five complexes: B 3 A 5, B2 A, B 3 A 4, B 2 A 2 and B 2 A 3. The last two complexes are present only in a small amount. In the system Pb(II)/MPD the same predominant polynuclear complexes, are found, together with some mononuclear species BA, BA 2 and BA 3. The composition and the stability constants of the complexes were determined with the aid of a computerprogram PNUC.