Analytical Sciences

Determination of Trace Amounts of Copper and Lead by Tungsten Metal Furnace Atomic Absorption Spectrometry after Preconcentration with Activated Carbon Impregnated with 1,2-Cyclohexanediondioxime

Atsushi UZAWA*, Tomohiro NARUKAWA* and Tadao OKUTANI**

*Department of Chemistry, Chiba Institute of Technology, Shibazono, Narashino, Chiba 275, Japan
**Department of Industrial Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda, Tokyo 101, Japan

A simple and rapid determination method for trace amounts of copper and lead in water and rock samples by tungsten metal furnace atomic absorption spectrometry was investigated. Copper and lead were quantitatively collected on activated carbon impregnated with 1,2-cyclohexanediondioxime (AC-Dox) at pH 5.0 for copper and pH 8.0 for lead. The cop-per and lead collected on an AC-Dox were eluted with 1 mol dm -3 hydrochloric acid, and the absorbances of the eluents were measured at 324.8 nm for copper and 283.3 nm for lead, respectively. The detection limit (S/N=3) for copper was 0.013 mg/5.0 cm 3 and that for lead was 0.075 mg/5.0 cm 3 . The relative standard deviations (n=5) were 2.0 - 4.0% for each metal. (Keywords: Activated carbon impregnated with 1,2-cyclohexanediondioxime, preconcentration, copper, lead, tungsten metal furnace atomic absorption spectrometry)

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