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合成了安替比林基重氮氨基-2,4-二硝基苯(APDNBT)新试剂,并首先研究了它的分析性质及其与镉的显色反应。在TritonX-100存在下,试剂的两级质子离解常数的pKa值分别是0.8和10.8;在pH=10.2～12.0的B-R缓冲溶液中,试剂与镉生成1:2的黄色配合物,呈褪色反应,吸光度差值最大的波长为540 nm,其表观摩尔吸光系数为1.52×10~5L/(mol.cm),线性范围每25mL为0～15μg;方法成功地用于测定地面水中的微量镉。
A novel reagent of diazepam - 2, 4 - dinitrobenzene (APDNBT) was synthesized and its analytical properties and its color reaction with cadmium were studied. In the presence of TritonX-100, the pKa values of the two-stage proton dissociation constants of the reagent are 0.8 and 10.8, respectively. In the BR buffer solution with pH = 10.2-12.0, the reagent produces a 1: 2 yellow complex with cadmium and shows a fading reaction , The wavelength of the maximum absorbance difference is 540 nm, the apparent molar absorptivity is 1.52 × 10 ~ 5L / (mol.cm), and the linear range is 0 ~ 15μg per 25mL. The method was successfully applied to the determination of trace cadmium .