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原理最近几年来,有机化合物直接微量測定氧的方法已广泛地应用。这个方法是J.Unterzaucher在1940年建立的,应用的原理如下:在氮气气流中,物貭妥热气化,經过900℃的鉑-炭反应炉,便氧轉变为一氧化碳,并用氫氧化鉀除去干扰气体,然后一氧化碳与五氧化碘在120℃溫度下反应,轉变为二氧化碳和碘。用氫氧化鈉溶液吸收碘,用溴水氧化碘成碘酸,最后用甲酸破坏剩余的溴,加入碘化鉀和硫酸,析出的碘用硫代硫酸鈉滴定。1 毫克的氧(?)7.5毫升0.02N的硫代硫酸鈉本法用3～5毫克标准样品,准确度为士0.2%,測定
Principle In recent years, the direct measurement of oxygen by organic compounds has been widely used. This method was established by J. Unterzaucher in 1940 and applied as follows: In a stream of nitrogen, the material is properly vaporized and passed through a platinum-carbon reactor at 900 ° C to convert oxygen to carbon monoxide and to potassium hydroxide Remove the interference gas, then carbon monoxide and iodine pentoxide at 120 ℃ temperature reaction, into carbon dioxide and iodine. With sodium hydroxide solution to absorb iodine, iodine with iodine bromine oxidation of iodine, and finally with formic acid to destroy the remaining bromine, potassium iodide and sulfuric acid, the precipitation of iodine with sodium thiosulfate titration. 1 mg of oxygen (?) 7.5 ml 0.02N sodium thiosulfate The law with 3 to 5 mg standard sample, the accuracy of ± 0.2%, determination