【摘要】 报道了 1 (4 硝基苯基) 3 (5 溴吡啶)三氮烯(NPBPDT)的合成及其与镉的显色反应.在TritonX 100的存在下,该试剂能与镉发生显色反应,形成摩尔比为 2∶1型的黄色配合物,在 440nm处有一最大正吸收峰,在540nm处有一最大负吸收峰.以 440nm为参比波长, 540nm为测量波长进行双波长测定,表观摩尔吸光系数为3. 14×105 L·mol-1·cm-1,镉的浓度在 0~0. 48mg/L范围内遵守比尔定律.用拟定方法测定废水中的微量镉,结果满意.更多还原

【Abstract】 The synthesis of a new reagent 1-（4-nitrophenyl）-3-（5-bromopyridyl）-triazene（NPBPDT） and its color reaction with cadmium （Ⅱ） cation were reported. In the presence of the surface active agent Triton X-100, a yellow complex was formed by the reaction of NPBPDT with cadmium（Ⅱ） cation. The molar extinction coefficient is 3.14×10⁵ L·mol^-1·cm^-1 by dual-wavelengh of 440 nm and determination wavelengh of 540 nm. Beer’s law is fit in the range of 0⁰.48 mg/L.The method has been applied to detect cadmium （Ⅱ） cation in waster water with satisfactory results.更多还原