A new triazene ligand, ((1-(ortoacyl benzene)3-(3,4-dichlorobenzene)triazene)) has been synthesized and k f value of it is complexes with Hg 2+ ‚ Ni 2+ ‚ Cd 2+ ‚ Pb 2+ ‚Cu 2+ ‚Ag + has been determined spectrophometrically. Because this ligand have good selectivity to copper ion, a simple, reliable and rapid method for preconcentration and determination of the ultratrace amount of copper using octadecyl silica membrane disk modified by this ligand, and determination by flame atomic absorption has been presented. Various parameters including pH of aqueous solution (7-8), flow rates (10 ml. min -1 ), the amount of ligand (6.0 mg) and the type of stripping solvent (0.1M nitric acid) have been optimized. The breakthrough volume was greater than 500 ml with an enrichment factor of more than 220 and 50ng ml -1 detection limit. The capacity of the membrane disks modified by 6mg of the ligand was found to be 220g of copper. The effects of various cationic interferences on the percent recovery of copper ion were studied. The method was successfully applied to the determination of copper ion in different samples.

Spectrophotometric Studies and Application of a New Asymmetric Triazene Ligand for Solid Phase Extraction of Ultratrace Copper and Determination by Flame Atomic Absorption Spectrometry

Mohammad Kazem Rofouei

Papers

Spectrophotometric Studies and Application of a New Asymmetric Triazene Ligand for Solid Phase Extraction of Ultratrace Copper and Determination by Flame Atomic Absorption Spectrometry