Abstract

Determination Of Cadmium (II) In Water And Plant Material With 3-Methoxy-4-Hydroxy Benzaldehyde-4-Bromo Phenyl Hydrazone(3,4���¢��������MHBBPH) And 4-Hydroxy Benzaldehyde-4-Bromophenyl Hydrazone (4-HBBPH) Using Spectrophotometry

Author(s): P.Chiranjeevi, D.Rekha, K.Suvardhan, K.Suresh Kumar, B.Jayaraj

A facile, sensitive and selective extractive spectrophotometric methods were developed for the determination of traces of cadmium (II) in various water and plant materials using newly synthesized reagents 3-methoxy-4-hydroxy benzaldehyde- 4bromophenyl hydrazone(3,4-MHBBPH), 4-hydroxy benzaldehyde- 4-bromophenyl hydrazone (4-HBBPH). Cd(II) forms red colored complex with (3, 4-MHBBPH) and yellow colored complex with (4-HBBPH)) in acetate buffer medium (pH 4.0) which increases the sensitivity and these complexes were extracted into chloroform. Under optimum conditions the maximum absorption of the chloroform extracts were measured at 503 nm, 303nm respectively. Beer’s law was obeyed in the range of 0.5 to 5.0 μg ml-1 for red colored complex and 1.0 to 10.0 μg ml-1 for yellow colored complex. The molar absorptivity and Sandell’s sensitivity of the [Cd(II)-3,4-MHBBPH] and [Cd-4- HBBPH] complex were as 0.0104×104 l mol-1 cm-1, 0.0048×104 l mol-1 cm-1and 0.067μg cm-2, 0.102 μg cm-2 respectively. The detection limit for [Cd (II)-3, 4- MHBBPH] and [Cd (II)-4-HBBPH] were found to be as 0.028 μg ml-1 and 0.056 μg ml-1. The detailed study of various interfering ions made the method more selective. The proposed methods were successfully applied for the determination of Cd(II) in water and plant materials. The performance of present methods were evaluated in terms of Student ‘t’ test and variance ratio ‘f’ test which indicates the significance of present method over reported method.