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在碱性介质中，铈（Ⅲ）能显著地阻抑Ｈ２Ｏ２氧化水扬基荧光酮（ＳＡＦ）褪色的指示反应，研究表明该动力学反应对铈（Ⅲ）为一级，测得反应的表观活化能为２８．７５ｋＪ／ｍｏｌ。据此建立了测定痕量铈的动力学分析法，测定条件为ＳＡＦ：４．０×１０－５ｍｏｌ／ｌ，Ｈ２Ｏ２：０．０１０％，ＮａＯＨ：２．０×１０－２ｍｏｌ／ｌ，５０℃。线性测定范围０．０４μｇ／ｍｌ～０．４４μｇ／ｍｌ，方法检测限为０．０２μｇ／ｍｌ（Ｃｅ）。当溶液中的铈含量为０．１６μｇ／ｍｌ时，３～８倍量的轻稀土，５～１１倍量的重稀土和同倍量的铀和钍等不干扰测定。测定了按不同稀土矿的稀土元素配分合成的样品中的铈含量，结果满意。
In alkaline medium, cerium (Ⅲ) can significantly suppress the reaction of H2O2 oxidized water with fluorophores (SAF) fading indications reaction, the study showed that the kinetic reaction of cerium (Ⅲ) for the first grade, the reaction table View activation energy of 28.75kJ / mol. The kinetic analysis method for the determination of trace cerium was established. The measurement conditions were SAF: 4.0 × 10-5mol / l, H2O2: 0.010%, NaOH: 2.0 × 10-2mol / l, . The linear range was 0.04μg / ml ~ 0.44μg / ml. The detection limit was 0.02μg / ml (Ce). When the content of cerium in the solution is 0.16μg / ml, the light rare earths of 3 ~ 8 times, the heavy rare earth of 5 ~ 11 times and the same times of uranium and thorium do not interfere with the determination. The content of cerium in the samples synthesized by the rare earth elements in different rare earth ores was measured and the results were satisfactory.