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常用碘量法测定锇是将四氧化锇的碱溶液在装有排气装置的容器中进行,用电位指示终点。我们在实践中发现,四氧化锇在碱溶液中易受试剂和空气中微量还原物质和氯离子的影响,往往使结果偏低,即使是四氧化锇标准溶液,因受此影响其浓度会随放置时间而变化。如将四氧化锇碱溶液在分液漏斗中酸化,并加入少量过氧化氢,则四氧化锇可被三氯甲烷定量萃取。将三氯甲烷层移入盛有微酸性溶液的另一分液漏斗中,加入碘化钾用标准硫代硫酸钠溶液滴定,即可在萃取用的三氯甲烷中用目视观测终点。方法简便、
Osmium commonly used in the determination of osmium is the osmium tetroxide solution in a container equipped with an exhaust device, with the potential indicator of the end. We have found in practice that osmium tetroxide is susceptible to the influence of trace amounts of reducing agents and chloride ions in alkaline solutions in alkaline solutions, often resulting in low results. Even with osmium tetroxide standard solutions, concentrations of Place time and change. If the osmium tetroxide solution is acidified in a separatory funnel and a small amount of hydrogen peroxide is added, osmium tetroxide may be quantitatively extracted with chloroform. The chloroform layer was transferred to another separatory funnel containing a slightly acidic solution and titrated with standard sodium thiosulfate solution by addition of potassium iodide to visualize the endpoint in chloroform for extraction. Method is simple,