α-ニトロソ-β-ナフトール錯体として水晶重みセンサー上への付着を利用する水中の微量コバルト(II)の定量

概要

論文の詳細を見る
Cobalt (II) reacts with α-nitroso-β-naphthol to form an insoluble complex in water. The precipitate adsorbed on a piezoelectric quartz crystal shifted the frequency. The frequency shifts were proportional to the amounts adsorbed. Acetic acid (10mM) andα-nitroso-β-naphthol (1.5mM) solutions were passed through the quartz mass sensor to get constant frequency (F_1). And then instead of the stream of the acetic acid solution, the cobalt (II) sample in 10mM acetic acid solution was passed. After exactly 5 min, the stream was changed to the acetic acid solution to get a constant frequency (F_2). The frequency change resulting from the adsorption of cobalt (II) complex was calculated as the difference, F_1-F_2. The concentration range (2〜60) μM of cobalt(II) could be determined from the calibration curve with good reproducibility. Cobalt(II) complex adhered could be removed from the sensor with acetic acid.
1991-08-05