高等学校化学学报 ›› 1986, Vol. 7 ›› Issue (3): 206.

• 研究论文 • 上一篇    下一篇

贵金属高灵敏显色反应的研究(Ⅶ)—钯(Ⅱ)-碘化钾(抗坏血酸)-罗丹明6G-聚乙烯醇体系

慈云祥1, 张经华2, 苏雯2   

  1. 1. 北京大学化学系;
    2. 北京市理化分析测试中心
  • 收稿日期:1984-11-11 出版日期:1986-03-24 发布日期:1986-03-24
  • 基金资助:

    中国科学院利学基金

Studies on Highly Sensitive Colour Reactions of Noble Metals (Ⅶ)—Palladium(Ⅱ)-Potassium lodide-Rhodamine 6G-PVA System

Ci Yunxiang1, Zhang Jinghua2, Su Wen2   

  1. Department of Chemistry, Peking University, Beijing
  • Received:1984-11-11 Online:1986-03-24 Published:1986-03-24

摘要: 钯在酸性溶液中与过量的I-生成配位阴离子[PdIn](n-2)-,再与R6G的阳离子产生离子缔合反应,生成电中性的蓝色缔合物沉淀,加入PVA后沉淀溶解,可以进行水相直接测定,本文拟定的分光光度法灵敏度高、稳定性较好,克服了萃取光度分析法的缺点,应用于阳极泥中钯的测定,得到较满意的结果。

Abstract: Anew highly sensitive colour reaction of palladium ( Ⅱ ) has been investigated, based on the formation of an aqueous soluble ion-association complex of palladium( Ⅱ ) with potassium iodide and rhodamine 6G(R6G) in the presence of polyvinylalcohol(PVA). The absorption maximum of the ion-association complex is at 560 nm, and its apparent molar absorptivity is 4.5×105 1·mole-1·cm-1 at 560 nm; Beer's law is obeyed for 0-80 ng/rnl of palladium. The interference of 40 dverse ions was studied. The proposed procedure was applied to the determination of palladium in anode slime.

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