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本文介绍一种自己设计、经改进的高频感应惰气熔融库仑定氧仪,经两年来的实际应用,证明仪器性能稳定,操作简单,分析结果准确可靠,灵敏度高,自动化程度高。方法基本原理本方法以纯氩为载气,在高频感应加热到1800°～2000℃左右高温下,将分析试样投入石墨坩埚中熔融,使试样中固溶氧及氧化物被过量的碳还原成一氧化碳而被提取出来,通过600℃氧化铜炉氧化成二氧化碳。二氧化碳被氩气载入吸收池,它被pH=9.5的过氯酸钡溶液吸收,反应溶液中因有过氯酸产生,而使pH值减小,用库仑滴定法使pH恢复到原始值,从电解脉冲数计算出试样中含
This paper introduces a self-designed, improved high-frequency induction inert gas melting Coulometric oxygen meter, after two years of practical application, the instrument proved stable performance, simple operation, accurate and reliable analysis results, high sensitivity and high degree of automation. Basic principles of the method The method of pure argon as a carrier gas, high frequency induction heating to about 1800 ° ~ 2000 ℃ high temperature, the analysis of the sample into the graphite crucible melting so that the solid oxide and oxide samples were excessive carbon Reduced to carbon monoxide and extracted, through 600 ℃ copper oxide furnace oxidation to carbon dioxide. Carbon dioxide is loaded into the cell by argon and is absorbed by the barium perchlorate solution at a pH of 9.5. Due to the presence of perchloric acid in the reaction solution, the pH is reduced and the pH is restored to its original value by coulometric titration. Calculate the sample content from the number of electrolytic pulses