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新合成了吡啶类三氮烯显色剂1-(4-硝基苯基)-3-(3,5-二溴吡啶)三氮烯(NPDBPDT),并研究了NPDBPDT与锌的显色反应。在Na2B4O7-NaOH缓冲溶液(pH 10.0)介质中,于表面活性剂Triton X-100存在下,锌与试剂生成1∶2络合物。该络合物在450 nm处有最大正吸收峰,以540 nm为参比波长,450 nm为测量波长进行双峰双波长测定,其表观摩尔吸光系数为2.17×105L.mol-1.cm-1,锌含量在0~12μg/25mL范围内符合比耳定律。
A new pyridinium triazene color reagent 1- (4-nitrophenyl) -3- (3,5-dibromopyridine) triazene (NPDBPDT) was synthesized and the color reaction of NPDBPDT with zinc . In a Na2B4O7-NaOH buffer solution (pH 10.0) medium, zinc forms a 1: 2 complex with the reagent in the presence of the surfactant Triton X-100. The complex has the largest positive absorption peak at 450 nm, the peak at 540 nm is the reference wavelength, and the peak at 450 nm is measured at two wavelengths. The apparent molar absorptivity is 2.17 × 10 5 L.mol -1.cm -1, and the content of zinc in the range of 0 ~ 12μg / 25mL complies with Beer’s law.