期刊论文

中文

分析试验室

1000-0720

2003

22

1

62-65

10.3969/j.issn.1000-0720.2003.01.018

本校为其他机构

在0．01mol·L^-1 LiNO3介质中（pH2.70)S2O3^2-有一灵敏的阴极溶出峰（－0．42V），其峰电流与S2O3^2-浓度在1×10^-7mol·L^-1～4×10^-6mol·L^-1范围内有线性关系。当富集200s时，检测限可达5×10^-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1．03×10^-9mol·cm^-2。该方法用于PbS2O3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 solubi...