Adsorption and Preconcentration of lead(II) by Solid-Phase Extraction Prior to Determination by Flame Atomic Absorption Spectrophotometry

A simple, reliable and rapid method for preconcentration and modification of silica gel with Isopropyl 2-[(isopropoxy carbothioyl)disulfanyl]ethanethioate(IIDE) in order to prepare an effective sorbent for the preconcentration and determination of lead. The sorption capacity of Isopropyl 2[(isopropoxy carbothioyl)disulfanyl]ethanethioate(IIDE)-modified silica-gel (IIDE MS) was 82.34 mg.g  -1 and the optimum pH for the quantitative recovery of lead was found as 5.3. The optimum flow rate, sorbent amount and sample volume were 8 mL.min , 300 mg and 50 mL, respectively. 10 mL of 0.1 mol.L HCl was the most suitable eluent. The recommended method is simple and reliable for the determination of lead without any notable matrix effect and successfully applied to environmental water samples.The limit of detection of the proposed method is 7.5ng per mL.The method was applied to the extraction and recovery of Pb(II) in different water samples. In this method is relative standard deviation (R.S.D.) of 2.7%.