Madhavi devireddy, B. Saritha, Prof. T. Sreenivasulu Reddy
2014
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Journal
IOSR Journal of Applied Chemistry
Abstract
Bromo-2-hydroxy-3-methoxybenzaldehyde-p-hydroxybenzoichydrazone reacts with Cu(II) forming brown coloured soluble complex in aqueous dimethyl formamide in the pH range 3.0-8.0. It has a λmax at 405 nm. Studies were carriedout at pH-5.0. The method obeys Beer's law in the range 0.317 to 3.81 μg /ml. The molar absorptivity is 1.412×10 4 L mol -1 cm -1 and Sandell's sensitivity is 0.0045μg/cm 2 . The standard deviation of the method for ten determinations of 1.59μg/m l o f Cu(II) i s 1.22×10 -3 . T h e correlation coefficient (γ) of the calibration equation of the experimental data is 0 . 9 999. The effect of various diverse ions is studied. The formula of the complex is 1:1 and its stability constant is 3.13×10 5 . Based on the above , a rapid, simple, sensitive and selective direct visible spectrophotometric method has been developed. The method developed was used for the determination of copper(II) in alloy ,fruit, leaf and biological samples. The results are in good agreement with the certified values.