Extractive spectrophotometric determination of copper(II) in water and alloy samples with 3-methoxy-4-hydroxy benzaldehyde-4-bromophenyl hydrazone (3,4-MHBBPH)

A facile, sensitive and selective extractive spectrophotometricmethod was developed for the determination of copper(II) in various water and alloy samples using a newly synthesized reagent, 3-methoxy-4-hydroxy benzaldehyde 4-bromophenyl hydrazone (3,4-MHBBPH). Copper(II) forms a orange colored complex with (3,4-MHBBPH) in acetate buffer medium (pH 4) which increases the sensitivity and the complex was extracted into chloroform. Under optimum conditions, the maximum absorption of the chloroform extract was measured at 462 nm. The Beer law was obeyed in the range of 0.20 to 4.0 ?g ml-1 of copper. The molar absorptivity and the Sandell's sensitivity of the complex were 2.0520 x 104 mol-1 cm-1 and 0.2540 ?g cm-2, respectively. The detection limit was found to be 0.0270 ?g mL-1. A detailed study of various interfering ions made the method more sensitive. The method was successfully applied for the determination of Cu(II) in water and alloy samples. The performance of the present method was evaluated in terms of Student 't' test and Variance ratio 'f ' test, which indicate the significance of the present method over reported methods. U radu je opisana jednostavna, selektivna i osetljiva spektrofotometrijska metoda za odredjivanje Cu(II) u uzorcima voda i legurama. Odredjivanje je zasnovano na gradjenju kompleksa sa novosintetisanim 3-metoksi-4-hidroksi-benzaldehid-4-bromo-fenil hidrazonom (3,4-MHBBPH). Kompleks se formira u acetnom puferu (pH 4), a potom ekstrahuje hloroformom. Na _ max = 462 nm, zavisnost absorpcije od koncentracije sledi Beer-ov zakon u opsegu od 0,20 - 4,0 ?g/ml bakra. Molarna absorptivnost kompleksa iznosi 2,052?10 4 l ?g mol-1 cm-1 , a Sandell-ov indeks 0,2540 ?g cm-2 . Granica detekcije iznosi 0,0270 ?g/mL bakra. Ispitan je uticaj interferirajucih jona u cilju povecanja osetljivosti odredjivanja bakra u uzorcima voda i legurama.