【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^-3mol/LCH₄N₂S-6.3×10^-2mol/L ClCH₂COOH-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AS₂O₃（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As₂O₃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。更多还原

【Abstract】 An optimum supporting electrolytic system, 1.3×10^-3mol/L CH₄N₂S-6.3×10^-2mol/L ClCH₂COOH-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 As₂O₃/ml to the above electrolytic system. This was more suitable for the distillate of the sample which was adsorbed by As₂O₃. 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.更多还原