PRECONCENTRATION an‎d EXTRACTION OF COPPER ION ON ACTIVATED CARBON USING alpha-BENZOINOXIME an‎d PYRIMIDIN 2-THIOLE

Activated carbon modified methods were used for preconcentration and determination of copper in somereal sample by flame atomic absorption spectrometry. The copper was adsorbed quantitatively on activated carbon due to their complexation with α-benzoinoxime and pyrimidin 2-thiole. The adsorbedcopper on solid phase was eluted quantitatively by using nitric acid. The important parameters such as pH,amount of carrier, flow rate, amount of activated carbon and type and concentration of eluting agent forobtaining maximum recovery were optimized. The methods based on α-benzoinoxime and pyrimidin 2-thiole at optimum conditions is linear over concentration range of 0.05-1.3(mu)g mL^-1 and 0.06-1.2 (mu)g mL^-1of cooper with correlation coefficient of 0.9997 and 0.9994 and both detection limit of 1.2 ngmL^-1,respectively. The preconcentration leads to enrichment factor of 200 and 240 and break through volume of 1200 mL for methods based on α-benzoinoxime and pyrimidin 2-thiole, respectively. The methods have good tolerance limit of interfering ion and selectivity that has been successfully applied for determinationof copper content in real sample such as blood, waste water and river sample.