摘要
本文通过大量实验,研究了一种新的锇的最佳支持电解质体系为:1.3×10^(-3)mol/LCH_4N_2S-6.3×10^(-2)mol/L ClCH_2COOH-0.1mol/L NaAc(pH=4.39)。在该体系中,以硫脲作吸附剂,并在直流极谱仪上于+0.55V(vs.SCE)发现一锐敏的锇峰。如在该体系中含有AS_2O_3(0.25μg/ml)时,测定锇的线性范围从0.037～0.224μg/ml扩展到0.037～0.37μg/ml,这很适宜于用As_2O_3吸附蒸馏试样。方法的灵敏度达37ng/ml。本法已成功地用于精矿测定,结果与原含量相符。
An optimum supporting electrolytic system, 1.3×10^(-3)mol/L CH_4N_2S-6.3×10^(-2)mol/L ClCH_2COOH-0.1mol/L NaAc(pH=4.39), has been studied. In this new system thiocarbamide was used as an absorbent and a sharp peak current of Os was found at +0.55V(vs. SCE) by using D.C. polarography. There was a well linear relationship from the range of 0.037～0.22μg/ml for Os extended to that of 0.037～0.37μg/ml for Os by adding a solution of 0.25μg As_2O_3/ml to the above electrolytic system. This was more suitable for the distillate of the sample which was adsorbed by As_2O_3. The sensitivity of the method can be reached to 37ng/ml. The above method has been successfully applied to the determination of refined mineral. It's results were agree with those of the original content.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1991年第2期178-181,共4页
Chinese Journal of Analytical Chemistry
基金
自然科学基金资助项目
关键词
贵金属
测定
锇
溶出伏安法
Precious metal, Osmium, Adsorptive-anodic stripping voltammetry
