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本文报告了在热浓磷酸溶液中,用硝酸铵作为氧化剂,以容量法测定铈的试验结果:在热浓磷酸溶液中(温度120～240℃,6～25毫升85%磷酸),0.25～4克硝酸铵(或0.5～30毫升浓硝酸),加热1～8分钟,能定量氧化100毫克铈。用于矿石测定时,试样用20毫升磷酸溶解后,趁热加入1克硝酸铵,摇动下使硝酸铵分解,即定量氧化铈的最佳条件。当锰与铈共存时,使用特定比例的亚砷酸钠-亚硝酸钠混合还原剂,可将高达60毫克的锰(Ⅲ)优先还原,而不干扰铈的测定。从而拟定了含锰矿石中铈的快速测定方法。
In this paper, we report the determination of cerium by the volumetric method using ammonium nitrate as the oxidant in hot concentrated phosphoric acid solution. The results of the determination of cerium in hot concentrated phosphoric acid solution (temperature 120 ~ 240 ℃, 6 ~ 25 ml 85% phosphoric acid), 0.25 ~ 4 Ammonium nitrate (or 0.5 to 30 ml of concentrated nitric acid) is heated for 1 to 8 minutes to quantitatively oxidize 100 mg of cerium. For ore determination, the sample was dissolved with 20 ml of phosphoric acid, while adding 1 g of ammonium nitrate hot, ammonium nitrate decomposition under shaking, the best conditions for the quantitative ceria. When manganese and cerium coexist, up to 60 mg of manganese (III) can be preferentially reduced without interfering with the determination of cerium using a specific ratio of sodium arsenite-sodium nitrite mixed reductant. Thus developed a rapid determination of cerium in manganese ore.