痕量硫代硫酸根的示波极谱法测定  

Determinaton of Trace Thiosulfate by Linear Sweep Polarogrphy

作　　者：蔡晓华[1] 潘斌[1] 赵藻藩 

机构地区：[1]武汉大学化学系

出　　处：《分析试验室》1989年第2期5-7,共3页Chinese Journal of Analysis Laboratory

摘　　要：在Fe^(2+)-NO_2^--VC体系中,在单扫示波极谱仪上,有一很灵敏的S_2O_3^(2-)阴极波,峰电位为-0.37伏(vs. SCE)。阴极导数波高与S_2O_3^(2-)浓度在6×10^(-8)mol/L—1×10^(-6)mol/L之间成线性关系,出限为5×10^(-8)mol/L。该法可用于环境水中痕量S_2O_3^(2-)的测定。该波具有吸附性质,系三元络合物Fe·S_2O_3-No催化溶解氧还原所致。In a solution of ferrous iron-nitrite-ascorbic acid, a sensitive linear sweep polarographic wave appears at -0.37V (vs. SCE). The height of the cathodic derivative peak is proportional to the concentration of thiosulfatc over a range Of 6×10^(-8) tol×10^(-6)mol/L. The detection limit is 5×10^(-4) mol/L. This procedure has been used for the determination of trace thiosulfate in water samples. The results show that the polarographic wave is ascribed to the catalytic reduction of the dissolved oxygen in the pr...

关 键 词：痕量 三元络合物 极谱波 单扫示波极谱 电活性物质 示波极谱仪 硫代硫酸根 阴极波 电极反应机理 共存物质 底液 汞电极 还原波 波高 VC NO 吸附性质 

分 类 号：O65[理学—分析化学]