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本文叙述了用自制的ReO_4选择电极和硫酸铵-柠檬酸铵-醋酸铵-醋酸离子液,采用直接电势法测定大量Mo、SO_4~(2-)、PO_4~(3-)、CO_3~(2-)、Cl~-、As等存在下的铼。方法快速、简便。试样中残存的少量有机溶剂不干扰测定。对于测定每升含铼毫克量级的试样优于通常采用的极谱法和光度法。方法的精密度优于±5％,回收率为92—111％。检测限约为1 mgl~(-1)。测定结果与极谱法结果吻合。本文还讨论了某些还原性物质(如Sn~(2+)严重干扰测定的原因及其消除方法。
This paper describes the determination of trace amounts of Mo, SO_4 ~ (2 -), PO_4 ~ (3 -), CO_3 ~ (2) using the self - made ReO_4 selective electrode and ammonium sulfate - ammonium citrate - ammonium acetate - -), Cl ~ -, As, and the like. The method is quick and easy A small amount of residual organic solvent in the sample does not interfere with the determination. It is superior to the commonly used polarographic and photometric methods for the determination of milligram samples per liter of rhenium. The precision of the method is better than ± 5% and the recovery rate is 92-111%. The detection limit is about 1 mgl ~ (-1). The results agree well with the polarographic results. This article also discusses the reason for some of the reducing substances (such as Sn ~ (2+) serious interference with the determination and its elimination method.