López F S, Nevado J J, Mansilla A E
Department of Analytical Chemistry, Faculty of Sciences, University of Extremadura, Badajoz, Spain.
Talanta. 1984 May;31(5):325-30. doi: 10.1016/0039-9140(84)80091-0.
The synthesis and analytical properties of dimedone bisguanylhydrazone (DIBG) are described for the first time. DIBG is oxidized by aerial oxygen and the reaction is catalysed by copper(II). The catalytic effect of copper(II) is increased by the presence of pyridine. Kinetic methods are described for determining trace amounts of copper(II) and pyridine. The reaction is followed spectrophotometrically by measuring the rate of change of absorbance at 550 nm. The calibration graphs are linear in the range 0.6-9.5 mug for copper(II) and 0.2-8.8 mg for pyridine. The methods have been applied to the determination of copper in galena and of pyridine in piperidine and isoamyl alcohol. The kinetic parameters of the reaction have been determined.
首次描述了二甲双酮双胍腙（DIBG）的合成及分析特性。DIBG 可被空气中的氧气氧化，该反应由铜（II）催化。吡啶的存在会增强铜（II）的催化效果。描述了测定痕量铜（II）和吡啶的动力学方法。通过测量 550 nm 处吸光度的变化速率，用分光光度法跟踪该反应。铜（II）的校准曲线在 0.6 - 9.5 μg 范围内呈线性，吡啶的校准曲线在 0.2 - 8.8 mg 范围内呈线性。这些方法已应用于方铅矿中铜的测定以及哌啶和异戊醇中吡啶的测定。已确定了该反应的动力学参数。
