マイクロ波加熱による4-（2-ピリジルアゾ）レソルシノールとCr(III)との錯形成反応の迅速化とプレカラム誘導体化HPLCによる微量Cr(III)の定量

概要

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The acceleration of a complexation of Cr(III)-4-(2-pyridylazo)resorcinolato (PAR) complex with microwave heating was achieved. Though it required more than 100 min for completing the complexation reaction of Cr(III) with 4-(2-pyridylazo)-resorcinol by heating with a hot-water bath, the reaction was completed within 2 min by microwave heating with a household microwave oven. The successful application of the acceleration of the complexation reaction by microwave heating to the derivatization of the determination method for trace Cr(III) by a pre-column derivatized ion-pair reversed-phase partition high-performance liquid chromatography was also accomplished. A detection limit as low as 7.7 nM was achieved, and a successful application of the proposed method to the determination of Cr(III) in the certified reference material of a river-water sample, JSAC 0302-3b, was also performed.