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报导了1(对硝基苯基)3(α吡啶基)三氮烯(NPPyT)的合成及质谱鉴定结果,研究了NPPyT在不同溶剂中的溶解性能、不同pH时的颜色和吸收光谱,以及NPPyT的离解平衡。提出了用NPPyT分光光度测定痕量镉(Ⅱ)的高灵敏度的新方法。测定是在pH9.3—10.5,有0.04%阳离子表面活性剂CPB存在下于480nm处进行。对于本法,试剂的加入顺序和乙醇的补加是重要的影响因素。Cd(Ⅱ)与NPPyT可形成1:2、1:3和1:4几种络合物,在测定条件下,只形成1:4的络合物,0—6μg/25mLCd(Ⅱ)范围服从比尔定律,其表观摩尔吸光系数为2.56×10~(5)。考察了56种阳、阴离子或化合物对测定的干扰情况,方法用于多种环境试样中痕量Cd(Ⅱ)的测定、结果良好。
The synthesis and mass spectrometric identification of 1 (p-nitrophenyl) 3 (α-pyridyl) triazene (NPPyT) were reported. The solubilities of NPPyT in different solvents, the color and absorption spectra at different pH, NPPyT dissociation equilibrium. A new method using NPPyT spectrophotometry for the high sensitivity of trace cadmium (II) was proposed. The assay was run at 480 nm in the presence of 0.04% cationic surfactant CPB at pH 9.3-10.5. For this method, the addition order of reagents and the addition of ethanol are important influencing factors. Cd (Ⅱ) and NPPyT can form several complexes of 1: 2, 1: 3 and 1: 4. Under the conditions of measurement, only 1: 4 complex was formed. The range of 0-6μg / Beer’s law, the apparent molar absorption coefficient of 2.56 × 10 ~ (5). The interference of 56 kinds of anions, anions and compounds on the determination was investigated. The method was applied to the determination of trace Cd (Ⅱ) in a variety of environmental samples with good results.