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本文研究了5-Br-DMPAP的合成方法以及在非离子型表面活性剂存在下该试剂与搞(Ⅱ)的显色反应。反应的适宜酸度范围为pH 8.5～9.0(氨性缓冲介质)。无论用OP或TritonX-100均能使Cd-5-Br-DMPAP络合物增溶于水溶液中。络合物的吸收峰在554nm波长处。在此波长测得其表观克分子吸光率为1.07×10~5。常见的金属离子如Ph(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)、Mn(Ⅱ)、Fe(Ⅲ)等对镉的测定有严重干扰。方法中采用DAM-CHCl_3萃取分离法使镉(Ⅱ)与其他共存离子分离。所建立的分析方法已应用于纯铜、纯镍、纯锌及锌合金中痕量镉的测定。
This article studies the synthesis of 5-Br-DMPAP and the chromogenic reaction of this reagent with (II) in the presence of non-ionic surfactants. The suitable acidity range of the reaction is pH 8.5-9.0 (ammoniacal buffer medium). The Cd-5-Br-DMPAP complex can be solubilized in aqueous solution with either OP or Triton X-100. The absorption peak of the complex is at a wavelength of 554 nm. At this wavelength, the apparent molar absorptivity was 1.07 × 10 ~ 5. The common metal ions such as Ph (Ⅱ), Cu (Ⅱ), Zn (Ⅱ), Mn (Ⅱ) and Fe (Ⅲ) have serious interference on the determination of cadmium. In the method, DAM-CHCl 3 extraction separation was used to separate cadmium (Ⅱ) from other coexisting ions. The established analytical method has been applied to the determination of trace cadmium in pure copper, pure nickel, pure zinc and zinc alloy.