Original Articles
B. Saritha*, A. Giri and T. Sr
Abstract
A rapid, simple, sensitive and selective direct spectrophotometric method has been developed for the determination of lead (II) in various real samples. 5-Bromo-2-hydroxy-3-methoxy benzaldehyde-phydroxybenzoic hydrazone reacts with Pb(II) forming green coloured soluble complex [ Pb(II)-5- BHMBHBH] in basic buffer solution. The maximum absorbance was observed in the pH range 7.0-9.0. Pb(II)-5-BHMBHBH complex solution shows λmax at 415 nm. The method obeys Beer’s law in the range 1.036-16.50μg /ml. The molar absorptivity is 1.125 ×104 L mol-1 cm-1 and Sandell’s sensitivity i s 0.0184mg/cm2. The standard deviation of the method for ten determinations of 4.144 μg/m l o f Pb(II) i s 0.00420. 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 5.93×106. The method developed has been applied for the determination of lead (II) in alloy samples, biological samples such as human hair, tea leaves and polluted ground water samples.