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本文在不同pH的Britton-Robinson缓冲溶液中和羟胺存在时,在-0.6至-0.7伏(对饱和甘汞电极)(其电位随溶液组成而改变)得到钌(Ⅲ)还原为二价的催化波。对此催化波的极谱性能如波高-汞柱高度关系,波高-滴落时间关系,波高-温度关系,波高-浓度关系,波高-溶液组分关系等进行实验。催化波的反应机理可概括为我们测定在pH6.7的Britton-Robinson缓冲溶液中和250℃时的k_f值为3×10~3克分子~(-1)·升·秒~(-2)。我们选择最灵敏而又准确测定钌(Ⅲ)的电解液是pH>9的Britton-Robinson缓冲溶液,盐酸羟胺浓度为0.3M。利用校准曲线的方法可测定少至0.5μM钌(Ⅲ),和检出0.2μM钌(Ⅲ),可作为测定钌(Ⅲ)的灵敏方法。
In this paper, the catalytic reduction of ruthenium (Ⅲ) to divalent at -0.6 to -0.7 V (for saturated calomel electrode), whose potential changes with the composition of the solution, is obtained in the presence of hydroxylamine in Britton-Robinson buffer solution at different pH wave. The experimental polarographic properties such as wave height-mercury column height, wave height-drip time, wave height-temperature relationship, wave height-concentration relationship, wave height-solution component relationship were investigated. The reaction mechanism of the catalytic wave can be summarized as follows: We determined the k_f value of Brittle-Robinson buffer solution at pH6.7 at 250 ℃ was 3 × 10 -3 mol -1 · s -2. . We choose the most sensitive and accurate determination of ruthenium (Ⅲ) of the electrolyte is pH> 9 Britton-Robinson buffer solution, hydroxylamine hydrochloride concentration of 0.3M. As low as 0.5 μM ruthenium (Ⅲ) and 0.2 μM ruthenium (Ⅲ) can be measured using the calibration curve as a sensitive method for the determination of ruthenium (Ⅲ).