The complex of lead (II) with the reagent 3-methyl-1, 2-cyclopentanodione dithiosemicarbazone, 3-Me-CPDT, has been studied. The composition, stability constant, and free energy change of formation of the complex have been determined. A sensitive spectrophotometric method for the determination of lead in aqueous solutions has been developed and applied for a range of concentration of 0-60μg/ml of lead using the complex Pb-3-Me-CPDT. The optimum conditions for maximum sensitivity of analysis such as standing time, pH, and wavelength have been determined. The effect of foreign ions on this method has also been studied.

Spectroscopy Letters, Volume 18, Issue 8 October 1985 , pages 583 - 592