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本文提出了非化学计量钨氧化物中氧指数精确测定的方法。在有KOH存在的情况下,将氧化物或多钨酸盐样品溶于K_3[Fe(CN)_6]溶液中,在氧化—还原反应中,钨被氧化为正六价,Fe(CN)_6~(3-)定量地被还原为Fe(CN)_6~(4-)。用重铬酸钾溶液进行滴定,以求出试样中的氧指数(O/W)。本文进行了分析方法鉴定,并与其他方法,如高锰酸钾容量法进行了对比,结果表明,本法准确度高,操作快速简便。
This paper presents a method for the accurate determination of oxygen index in non-stoichiometric tungsten oxide. In the presence of KOH, the sample of oxide or polytungstate is dissolved in a K_3 [Fe (CN) _6] solution. During the oxidation-reduction reaction, tungsten is oxidized to hexavalent hexavalent Fe (CN) (3-) is quantitatively reduced to Fe (CN) _6 ~ (4-). Titration with potassium dichromate solution was performed to determine the oxygen index (O / W) in the sample. In this paper, the identification of analytical methods, and with other methods, such as potassium permanganate capacity method were compared, the results show that the accuracy of this method, the operation is quick and easy.