Determination of copper and cadmium by atomic absorption spectrometry withelectrochemical and sorption preconcentration

A method is proposed for the determination of copper and cadmium by atomic absorption spectrometry in a propane-butane-air flame with electrochemical and sorption preconcentration. Electrochemical preconcentration was perform ed on metal (tantalum, titanium, molybdenum, and platinum), glassy-carbon, and spectrographic graphite electrodes. Sorption preconcentration was perfo rmed on filter paper with immobilized dithizone, 8-hydroxyquinoline, and ru beanic acid. It is demonstrated that copper and cadmium can be determined i n water within the concentration range 1-10 mu g/L.