Analytical Sciences

Nanocomposite Magnetite-Kaolin for Rh Preconcentration and Determination by Electrothermal Atomic Absorption Spectrometry

Mai FURUKAWA,* Ikki TATEISHI,** Hideyuki KATSUMATA,* Risako KUSUNOKI,* and Satoshi KANECO*,**

*Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan
**Global Environment Center for Education & Research, Mie University, Tsu, Mie 514-8507, Japan

A preconcentration technique with a magnetite-kaolin adsorbent capable of magnetic separation was developed for the determination of rhodium in environmental samples. The magnetite-kaolin nanocomposite was prepared for the preconcentration of rhodium in an aqueous solution prior to an electrothermal atomic absorption spectrometric determination. The detection limit (3S/N) of rhodium was 16 pg mL⁻¹ under the optimum conditions. Even though matrix elements existed in 10³ fold excess in aqueous solution, the rhodium adsorption could be not affected by the matrix. The present method could be applied to the determination of Rh in an aqueous solution. The advantages are easy preparation of the adsorbent and fast magnetic separation.

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