Development and Optimization of Analytical Method for Synergistic Extraction and Spectrophotometric Determination of Cadmium(II) by using 1-(2',4'- dinitroaminophenyl)-4,4,6-trimethyl-1,4-dihydropyrimidine-2-thiol: Analysis of Alloys, Thin Film and Biological Material
Journal of Trace Element Analysis
A synergistic, simple and selective spectrophotometric method has been developed for 1-(2', 4'dinitroaminophenyl)-4,4,6-trimethyl-1,4-dihydropyrimidine-2-thiol [2', 4'-dinitro APTPT] as a novel chromogenic reagent. The proposed method is based on the synergistic extraction of cadmium(II) with 2', 4'dinitro APTPT (0.01 mol L -1 ) in presence of 0.5 mol L -1 pyridine to give orange red coloured ternary complex of a molar ratio 1:2:2 (M:L:Py) in the pH range 9.3 -9.7. It exhibits a maximum
... s a maximum absorption of coloured complex at 425 nm in chloroform against the reagent blank and the absorbance remains stable for at least 20 h. The system obeys Beer's law in the concentration range 1.0 -12.5 µg mL -1 of cadmium(II) and optimum range of 2.5 -12.5 µg mL -1 of the metal as evaluated by Ringbom's plot. The molar absorptivity and Sandell's sensitivity of cadmium (II) -2', 4'-dinitro APTPT-pyridine complex (1:2:2) was established by Job's method, mole ratio method and slope ratio method. Interference of the foreign ions was investigated and use of suitable masking agent enhances the selectivity of the method. The proposed method is rapid, reproducible and successfully applied for the determination of cadmium(II) in binary and synthetic mixtures, alloys, thin films and tobacco sample. The results of the present study were compared with that of atomic absorption spectrophotometer to test the validity of the method.