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Extractive Spectrophotometric Determination of Copper (II) with [N-(O-Methoxy benzaldehyde)-2-amino Phenol]

Ritika M. Makhijani and V. D. Barhate

A simple, rapid and sensitive spectrophotometric method has been developed for the determination of Cu (II) by using N-(o-methoxy benzaldehyde) 2-aminophenol (NOMBAP) as an analytical reagent. NOMBAP has been synthesized and characterized by elemental and spectral analysis. NOMBAP extracts Cu (II) quantitatively (99.78%) into chloroform from an aqueous solution of pH range 5.7-6.8. The chloroform extract shows an intense peak at 440 nm (λmax). Beer’s law is obeyed over the Cu (II) concentration range of 0.1-4.0 μg/mL. The Sandell’s sensitivity and molar absorptivity for Cu-NOMBAP system is 0.00246 μgcm-2 and 25739 L mole-1 cm-1, respectively. The composition of extracted species is found to be 1 : 2 (Cu: NOMBAP) by Job’s Continuous Variation and Mole Ratio Method. The average of 10 determination of 10 μg of Cu (II) in 10 cm3 of solution is 10.02 μg, which is varied between 9.964 μg and 10.076 μg at 95% confidence limit and standard deviation is ± 0.079. Interference by various ions has been studied. The proposed method has been successfully applied for determination of Cu (II) in alloy and pharmaceutical samples.