Abstract

1-(2-Quinolylazo)-2,4,5-trihydroxybenzene as Spectrophotometric Reagent for Micro-determination of Palladium (II)

Author(s): Pratap Singh Kadyan, Devender Singh, Ashok Sharma and Ishwar Singh

Alcoholic solution of 1-(2-quinolylazo)-2,4,5-trihydroxybenzene (QATB) forms two colored complexes with palladium (II) in different pH ranges, (red wine - λmax 620 nm, pH 3.0-5.5 and green- λmax 675 nm, in alkaline medium). The red wine complex had molar absorptivity and the Sandell’s sensitivity 1.25 X104 L.mol-1cm-1 and 0.0085 μg.cm-2 respectively. Beer’s law was followed upto 8.5 ppm with an optimum concentration range of 1.9- 7.95 ppm. The green coloured Pd(II)-QATB complex had molar absorptivity of 1.2 X104 L.mol-1cm-1 showing Sandell’s sensitivity of 0.0087 μg.cm-2 . Beer’s law was followed upto 9.4 ppm with the optimum concentration range of 1.6-8.5 ppm. Effect of foreign ions tested for their interferences and use of masking agents have been tabulated in the micro-determination of palladium(II). Analytical method established at low pH showed good selectivity and its application was extended to determine Pd(II) in some synthetic solutions equivalent to that of some alloys, hydrogenation catalysts etc.

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