硫代硫酸根的溶出伏安吸附性质及应用  

Study on adsorptive stripping voltammetric behavior of thiosulfate on Hg electrodes and its application

作　　者：宋书香 詹彤[2] 陆光汉[2] 

机构地区：[1]河南平顶山师范专科学校,平顶山467002 [2]华中师范大学化学学院,武汉430079

出　　处：《分析试验室》2003年第1期62-65,共4页Chinese Journal of Analysis Laboratory

摘　　要：在 0 .0 1mol·L-1LiNO3介质中 (pH 2 .70 )S2 O32 -有一灵敏的阴极溶出峰( - 0 .42V) ,其峰电流与S2 O32 -浓度在 1× 1 0 -7mol·L-1～ 4× 1 0 -6mol·L-1范围内有线性关系。当富集 2 0 0s时 ,检测限可达 5× 1 0 -8mol·L-1。溶出峰具有吸附性质 ,在悬汞电极上的吸附符合Frumkin等温式。测得在悬汞电极上的饱和吸附量为 1 .0 3× 1 0 -9mol·cm-2 。该方法用于PbS2 O3溶度积的测定 ,结果与文献值基本一致。In the 0.01 mol/L LiNO 3 solution, S 2O 3 2- was determined by cathodic stripping voltammetry. A sensitive reduction peak was found at -0.40 V (vs. SCE). The peak current was linear to the thiosulfate concentration in the range of 1×10 -7 mol/mL～4×10 -6 mol/mL with a detect limit of 5×10 -8 mol/mL. The experiment showed that the peak had adsorptive property and obeyed Frumkin isotherm. The saturated adsorptive amounts of S 2O 3 2- was measured to be 1.03×10 -9 mol/cm2. The method was applied to determine the solubility products (K sp) of PbS 2O 3 with satisfactory results.

关 键 词：硫代硫酸根 吸附溶出伏安 

分 类 号：O657.1[理学—分析化学]