Abstract

5-Tert-butyl-2-hydroxy-benzaldehyde oxime ( L1) and 3,5- di-tert-butyl-2-hydroxy-benzaldehyde oximeL2) are synthesized and characterized by conventional spectroscopic methods. These ligands are usedL1 or 4mg of L2 was found to be 284.7 (±2.8)g of copper and 382.5 (±3.1)g of copper,−1 for L1 and 0.25 ng ml−1 for L to the extraction, recovery and detection of copper in different water samples. 2. The enrichment factors are greater than 400 for both cases. These methods were successfully applied ( as modifier of octadecyl silica membrane disks for separation and pre-concentration of trace amounts of copper(II) ions, followed by sulfuric or nitric acid elution and flame atomic absorption spectrometric (FAAS) determination. The effect of parameters influencing the extraction efficiency i.e. pH of sample solutions, amount of the oxime, type and volume of eluent, sample solution and eluent flow rates were evaluated. Under optimum experimental conditions, the maximum capacity of the membrane disks modified by 6mg of respectively. The detection limits of the presented methods are 0.29 ng ml