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根据氧化还原反应,用容量法测定铈(Ⅳ)时,首先均需选择适宜的氧化剂,将低价铈(Ⅲ)氧化均为高价状态[Ce(Ⅳ)],再以亚铁盐标准溶液滴定之。铋酸钠及过氧化铅等氧化剂,由于操作繁琐,在生产实践中已很少采用。过硫酸铵虽获广泛应用,但仍不能满足快速分析的要求,尤其当有锰等干扰元素共存时,快速测定铈就更为困难。本文在热浓磷酸介质中用高氯酸作氧化剂,解决了含锰铁矿石中铈的快速测定问题。
According to the redox reaction, when cerium (Ⅳ) is determined by the volumetric method, the suitable oxidant should be selected firstly, the low-valent cerium (Ⅲ) should be oxidized to the high state [Ce (Ⅳ)], and then titrated with ferrous salt standard solution It Sodium bismuth and lead peroxide and other oxidants, due to cumbersome operation, has rarely been used in production practice. Although ammonium persulfate has been widely used, but still can not meet the requirements of rapid analysis, especially when manganese and other interfering elements coexist, the rapid determination of cerium is even more difficult. In this paper, the use of perchloric acid as oxidant in hot concentrated phosphoric acid medium to solve the rapid determination of cerium in manganese ore containing iron ore.