鸟嘌呤-铜配合物在汞电极表面上的电吸附性的研究  

Investigation of Adsorption of Cu(Ⅱ) Complex with Guanine atMercury Electrode

作　　者：孙贤祥[1] 

机构地区：[1]江苏石油化工学院应化系,常州213016

出　　处：《分析科学学报》1999年第5期394-397,共4页Journal of Analytical Science

摘　　要：在０．０２ ｍ ｏｌ／ＬＮａＨＣＯ３－０．０５ ｍ ｏｌ／Ｌ Ｎａ２ＳＯ４ 介质中，用极谱法和伏安法研究表明，铜－鸟嘌呤配合物在汞电极表面上的吸附服从Ｌａｎｇｍ ｕｉｒ 吸附。测得其饱和吸附量Γｍ＝ １．１×１０－ １０ ｍ ｏｌ／ｃｍ ２，吸附系数β＝ ４．７×１０４，吸咐自由能△Ｇｏ＝ － ３６．６ ｋＪ／ｍ ｏｌ。在８×１０－ ６ ｍ ｏｌ／Ｌ Ｃｕ２＋ 离子存在下，可用示差脉冲阴极吸附溶出法测定８×１０－ １０～１×１０－ ８ｍ ｏｌ／Ｌ浓度范围鸟嘌呤。Adsorption of Cu(Ⅱ) guanine complex at the mercury electrode has been studied in the medium of 0.02 mol/L NaHCO 3~0.05 mol/L Na 2SO 4 by using electrochemical methods. The compound is strongly adsorbed on the electrode,and Langmuir type of adsorption isotherm for the complex is observed .The maximum surface concentration( Γ m ), adsorption coefficient ( β ) and Gibbs energy of adsorption (△ G 。) determined are 1.1×10 -10 mol/L, 4.7×10 4 and -36.6 kJ/mol, respectively. In the presence of Cu(Ⅱ) ions, as low as 8×10 -10 ～1×10 -8 mol/L guanine can be determined by adsorption cathodic stripping differential pulse polarography.

关 键 词：电化学吸附 测定 鸟嘌呤 铜 配合物 汞电极 

分 类 号：O614.121[理学—无机化学] Q526.03[理学—化学]