The Open Analytical Chemistry Journal
2008, 2 : 78-82Published online 2008 December 31. DOI: 10.2174/1874065000802010078
Publisher ID: TOACJ-2-78
Direct and Derivative Spectrophotometric Determination of Copper(II) with 5-Bromosalicylaldehyde Thiosemicarbazone
Department of Chemistry, Sri
Krishnadevaraya University, Anantapur-500013, A.P., India.
ABSTRACT
A rapid and sensitive spectrophotometric method is developed for the determination of Copper (II) in aqueous DMF medium. The metal ion forms a light greenish yellow coloured complex with 5-bromo salicylaldehyde thiosemicarbazone (5-BSAT) in acidic medium. The complex shows absorption maximum at 390nm. Beer's law is obeyed in the range 0.31 – 6.35 µgml-1 of Copper (II). The molar absorptivity (ε) and Sandell’s sensitivity are found to be 1.08 X 104 l mole-1 cm-1 and 0.062 µgcm-2 respectively. A method for the determination of copper by third derivative spectrophotometry is also proposed. The methods have been employed successfully for the determination of copper in grape leaves and aluminum based alloy samples.