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在磷酸介质中 ,在Mn(Ⅱ )和氨三乙酸存在下 ,β 环糊精 (β CD)对Ce(Ⅳ )氧化二安替比林基 对氨基苯基甲烷 (DApAM)的显色反应具有明显的增稳和增敏作用 ,据此建立了测定铈的光度法体系。反应产物至少可稳定 6h ,最大吸收波长λmax=5 4 0nm ,ε=7.74× 1 0 5L·mol- 1 ·cm- 1 ,Ce(Ⅳ )量在 0 .5 μg/ 2 5mL～ 4.0μg/ 2 5mL 范围内具有线性关系 ,已用于银基合金中微量铈的测定。
In the presence of Mn (Ⅱ) and nitrilotriacetic acid, the chromogenic reaction of β-cyclodextrin (β CD) on the DA (dimethylanilinium) diampene oxide (DApAM) Obviously stabilizing and sensitizing effect, thus the spectrophotometry system for the determination of cerium was established. The reaction product was stable at least for 6h, the maximum absorption wavelength was λmax = 5400nm, ε = 7.74 × 105L · mol-1 · cm-1 and Ce (Ⅳ) 5mL range has a linear relationship has been used for the determination of trace cerium in silver-based alloys.