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在H3PO4介质中,增敏剂非离子表面活性剂Triton X-100存在下,痕量铈(对高碘酸钾氧化天青Ⅰ的反应具有催化作用,据此建立一种测定痕量铈(的新方法。研究了吸收光谱、试剂用量、干扰离子等因素的影响,测定了动力学参数。在最佳实验条件下,方法线性范围为0～80μg/L,检出限为4.58×10-7g/L;催化反应为动力学零级反应,表观活化能为96.04kJ/mol,反应速率常数为3.61×10-3/s;反应在表面活性剂存在下,灵敏度提高3倍。此法用于稀土氧化物中铈的测定,相对标准偏差小于2.5%,加标回收率为100%～103%。
In H3PO4 media, trace amounts of cerium (catalyzed by potassium periodate for the oxidation of azure I) was established in the presence of the sensitizer non-ionic surfactant Triton X-100 to establish a method for the determination of trace cerium New method.The kinetic parameters were studied by the influence of absorption spectra, reagent dosage, interference ions and other factors.Under the optimum experimental conditions, the linear range of the method was 0 ~ 80μg / L with the detection limit of 4.58 × 10-7g / L; the catalytic reaction is kinetic zero-order reaction, the apparent activation energy is 96.04kJ / mol and the reaction rate constant is 3.61 × 10-3 / s; the sensitivity is increased by 3 times in the presence of surfactant The determination of cerium in rare earth oxides, the relative standard deviation of less than 2.5%, the recovery was 100% to 103%.