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本文探讨了Y~(3+)与碱性染料罗丹明B络合物的极谱行为。 在NH_4Cl底液中,二苯胍存在下,罗丹明B在-1.50伏(SCE)附近有一个大而稳定的极谱吸附还原波,Y~(3+)使示波导数波降低。在最佳实验条件下,在1×10~(-7)-1×10~(-6)M的范围内Y~(3+)浓度与波高降低有良好线性关系。重稀土行为相似,可能用于测定重稀土总量。 通过i-t曲线,循环伏安图、比较dc、dpp、示波极谱常规波和导数波,研究了体系的还原机理。Y~(3+)与罗丹明B和二苯胍可能形成离子缔合络合物,强烈吸附并占据滴汞表面。络合物在罗丹明B还原波后还原,致使罗丹明B本身的波降低。在dc和示波常规波中。两波不能分开,在dpp中因电压扫描慢,无良好线性关系。只有在示波导数波上表现为一种灵敏的极谱波。
In this paper, the polarographic behavior of Y ~ (3 +) complex with rhodamine B complex was investigated. Rhodamine B has a large and stable polarographic adsorption reduction near -1.50 V (SCE) in the presence of diphenylguanidine in NH_4Cl solution, and Y ~ (3+) decreases the number of oscillometric waves. Under the best experimental conditions, there is a good linear relationship between the concentration of Y ~ (3 +) and the wave height reduction in the range of 1 × 10 -7 -1 × 10 -6 M. Heavy rare earths behave similarly and may be used to determine the total heavy rare earths. By i-t curve, cyclic voltammogram, comparison dc, dpp, oscillopolarographic conventional wave and derivative wave, the reduction mechanism of the system was studied. Y ~ (3+) and rhodamine B and diphenyl guanidine may form ion-association complexes, which strongly adsorb and occupy the droplet mercury surface. The complex is reduced after reduction of rhodamine B, resulting in a decrease of the rhodamine B itself. In dc and oscillometric conventional waves. Two waves can not be separated, due to voltage sweep in dpp slow, no good linear relationship. Only in the oscilloscope wave showed a sensitive polarographic wave.