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本工作采用鉑电极预电解富集硝酸鉀溶液中微量銀离子,再在线性变化电压下阳极溶解的方法,研究了电积銀薄层阳极溶解的情况。测定前把电极預极化处理后,可得重复結果。在我們的实驗条件下,电积銀阳极溶解后,在鉑电极上沒有发现有銀殘留的现象。电积銀薄层阳极溶解过程的活化能約3.5千卡/克分子,溶解过程受攪拌影响很大,电溶解峯值电流与电压变化速度有线性关系,这是支持电溶解过程由扩散控制的论点的。电溶解峯值电流和銀离子濃度的关系,在較广的濃度范圍内(2×10~(-7)-10~5M),存在直线关系。在严格控制实驗条件的情况下(电极預处理,溶液体积,溶液攪拌和电极位置等),結果重复性在10%以下。所以这个方法也提供了测定溶液中微量銀离子的可能性。
In this work, platinum electrode preconcentration was used to enrich trace silver ions in potassium nitrate solution and then anodic dissolution was carried out at a linear voltage. Before the determination of the electrode pre-polarization treatment, can be repeated results. Under our experimental conditions, no silver residue was found on the platinum electrode after the electrodeposited silver was anodically dissolved. The activation energy of thin silver anodic dissolution process is about 3.5 kcal / mol. The dissolution process is greatly affected by stirring. The peak current of electrolysis has a linear relationship with the rate of voltage change. This is the argument that diffusion control should support the process of electrolytic dissolution of. There is a linear relationship between the peak current and the silver ion concentration in a wide range of concentration (2 × 10 -7 -7 -10 -5 M). Under the strict control of the experimental conditions (electrode pretreatment, solution volume, solution agitation and electrodeposition, etc.), the repeatability is less than 10%. So this method also provides the possibility of measuring trace silver ions in solution.