ISSN : 0975-9492


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Title : Comparative study of Palladium (II) using 4-Hydroxy 3, 5 dimethoxy benzaldehyde 4-hydroxy benzoyl hydrazone and Cinnamaldehyde 4-hydroxy benzoylhydrazone in presence of micellar medium by Spectrophotometry
Authors : D.Gopala Krishna, N.Devanna, K.B.Chandrasekhar
Keywords : Comparative study of Palladium (II), Spectrophotometry, Hydrogenation catalyst samples, Synthetic alloy samples, water samples, micellar medium, HDMBHBH, CMHBH.
Issue Date : September 2010
Abstract :
Two simple, sensitive, rapid and selective spectrophotometric methods have been developed for the determination of Palladium (II) using newly synthesized reagents 4-Hdroxy3,5dimethoxy benzaldehyde-4-hydroxybenzoylhydrazone (HDMBHBH) and Cinnamaldehyde 4-hydroxy benzoylhydrazone (CMHBH) in presence of neutral surfactant TritonX-100-5% (micellar medium). Palladium (II) forms a brown coluored water-soluble complex with HDMBHBH and CMHBH-in the pH range 1.0-6.0. The Pd (II)-HDMBHBH complex shows maximum absorbance at ?max 373 nm in the pH range 3.0-4.0 and Pd (II)-CMHBH shows at ?max 375 nm in the pH range 4.0-5.0. At these wavelengths (?max), the complex shows maximum absorbance while the reagent blanks shows negligible absorbance. Hence, analytical studies were carried out at ?max 373 nm at pH 3.0 for HDMBHBH and 375 nm at pH 4.0 for CMHBH against reagent blanks. Beer's law is obeyed in the range 0.106-1.064 g ml-1 and the optimum concentration range from ringbom plot is 0.212-0.957 ?g/ml of Palladium (II) for both reagents. The molar absorptivity and Sandell's sensitivity for the coloured solution were found to be 7.5 x 104 L mol-1 cm-1 and 0.0015-g. cm-2 for HDMBHBH, 6.0x104L mol-1 cm-1 , and 0.0017 -g. cm-2 for CMHBH respectively. The interference effects of various diverse ions have been studied. Palladium (II) forms 1:1 complex with HDMBHBH and CMHBH stoichiometry with stability constant 7.29 x 106 for HDMBHBH and 3.55 x 106 for CMHBH. The standard deviation in the determination of 0.638-g ml-1 of Palladium (II) is 0.003 for HDMBHBH and 0.008 for CMHBH. The Relative standard deviation is 0.71% for HDMBHBH and 2.5% for CMHBH. First and second order derivative spectroscopic methods were developed at ?max 422 nm and 444 nm for HDMBHBH and at 402 nm and 438 nm for CMHBH respectively, for the determination of Palladium (II), which is more sensitive than the zero order method. The developed method has been employed for the determination of Palladium (II) in hydrogenation catalyst samples, synthetic alloy samples and in water samples. The results are in good agreement with the certified values.
Page(s) : 301-311
ISSN : 0975-9492
Source : Vol. 1, No.8