【摘要】 紫脲酸铵浓度大于1.7×10^-4M时呈现一个导数脉冲极谱峰;低于1.7×10^-4M时又呈现另一吸附后峰;在1.6×10^-5M时,主峰随pH增高而降低;达pH=5.48时,转为负峰,动物胶能有明显的抑制作用.这是一种新的吸附现象,表明了紫脲酸铵吸附过程的复杂性,对其机理进行了讨论.锌离子与紫脲酸铵共存时形成配合物,呈现五个峰,也明显反映了紫脲酸铵的吸附现象.计算了紫脲酸铵与锌的配合物的稳定常数,在给定条件下（pH=5.95,25℃）,logβ=3.4.讨论了配位机理.更多还原

【Abstract】 Murexide yields a well-defined derivative pulse polarographic peak in concentration larger than 1.7×10^-4M, but a post peak in adsorption character appears in concentration less than 1.7×10^-4M. When murexide concentration is 1.6×10^-5M, the main peak decreases with increasing pH and turns into a negative one after pH 5.48. It can be suppressed apparently by gelatin. This is a new adsorption phenomenon showing the complexity of murexide adsorption.Murexide may form complex with zinc ion. They together yield five peaks and show the adsorption phenonmenon. The stability constant of zinc-murexide complex is calculated to be log β= 3.4 at given conditions （pH=5.95, 25℃）. The mechanism of complex formation and adsorption process is discussed.更多还原