Atomic absorption spectroscopic determination of Cu(II) after preconcentration with 1,5-diphenylcarbazone loaded on naphthalene

A sensitive and selective method has been developed for determination of co pper in drug, river water and alloy samples. Copper(II) was adsorbed on nap hthalene loaded with 1,5-diphenylcarbazone from the aqueous solutions at th e pH range 3.5-4.5. After filtration, the metal ions were desorbed with 6 m l (batch method) or 5 mi (column method) of 1 mol l(-1) HCl solution and de termined by atomic absorption spectrometry. The detection limit is 0.2 mug and the calibration graph is linear over concentration range from 0.5 to 90 mug of copper in 30 ml of the sample solutions. Various parameters such as effect of pH, volume of aqueous phase, shaking time and interference of a number of foreign ions on the determination of copper have been studied in detail.