Sushama. M. Lele; Poonam. P. Shevde; Rama. S. Lokhande. Analytical Method Development and Its Application to Extractive Spectrophotometric Determination of Co (II) Using 1, 2-Propanedione, 1- Phenyl-1-(2-Hydroxybenzylideneazine)-2-Oxime (PDPHBAO). IJPAR 2013, 2, 98-102.