OPTIMIZATION OF LEAD DETERMINATION IN WATER SAMPLE BY ATOMIC ABSORPTION SPECTROSCOPY USING TiO2/Al2O3 NANOCOMPOSITE

Abstract

Lead content in water sample was enrichmented by TiO₂/Al₂O₃ nanocomposite and then determined by atomic absorption spectroscopy. The properties of TiO₂/Al₂O₃ nanocomposite material were determined by SEM, EDX, XRD methods. The solid phase extraction conditions such as pH, material mass, adsorption time, and eluent concentration were investigated. The results showed with using 150 mg of adsorbent in 60 minutes at pH 7 and the concentration of 2M HNO₃ eluent, the adsorption efficiency reached 100% and the desorption efficiency reached 94.65% with the initial concentration of Pb²⁺ ion of 500 µg/L. Lead ions were determined by atomic absorption spectroscopy with optimal conditions in a linear range 5.0÷40.0 µ/L of Pb² (r² = 0.9997) with method detection and method quantification limits of 0.93 µg/L and 3.10 µg/L, respectively, the recovery efficiency of the method is about 95.85%. The method was used for the determination of lead ions in water samples.