Study of Kinetics of Complexation Reaction of Co^(2+) with 2-benzoylpyridine-4-phenyl-3-thiosemicarbazone and Kineticspectrophotometric Determination of Cobalt

摘要

Kinetics of complexation reaction of Co2+ with 2-benzoylpyridine-4-phenyl-3-thiosemicarbazone(BPPT) was spectrophotometrically examined at 421 nm.The ligand that is developed for a simple kinetic-spectrophotometric determination of Co2+ is based on 1:2 complex formation between Co2+ and BPPT.The complexation reaction was carried out in ethanol-water medium at 25 ℃.Kinetic and activation parameters of the complexation reaction were calculated,and the rate equation and the reaction mechanism were proposed.The calibration graph is linear in the concentration range of 0.10～2.91 mg·L-1 for the tangent method.The species that caused interference were investigated.