Solid phase extraction of ultra traces copper (II) using octadecyl silica membrane disks modified by a new Schiff base ligand prior to determination by furnace atomic absorptionAuthor(s): Mahmood Payehghadr, Nahid Satei, Lotf Ali Saghatforoush
A simple, reliable and rapid method for pre-concentration and determination of ultra trace copper using octadecyl silica membrane diskmodified by a recently synthesized new Schiff base ligand (5-Nitro-N(2-pyridylethyl Sulfanyl Ethyl) Salisyl Salysilyden Imine), and furnace atomic absorption spectrometry is presented. Various parameters including pH of aqueous solution, flow rates, the amount of ligand and type of stripping solvents were optimized. The breakthrough volume is greater than 2000 ml with an enrichment factor ofmore than 400 and 3.4 ngL-1detection limit. The capacity of the membrane disks modified by 5 mg of the ligand was found to be 327.38µg copper. The effects of various cationic interferences on percent recovery of copper ion were studied. The method was successfully applied for the determination of copper ion in different cowmilk samples.