应用化学 ›› 1991, Vol. 0 ›› Issue (2): 37-41.

• 研究论文 • 上一篇    下一篇

超高灵敏显色反应及其应用的研究——Ⅴ.高灵敏光度法测定钼

滕毓敏, 许生杰   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1990-01-20 修回日期:1990-05-19 出版日期:1991-04-10 发布日期:1991-04-10
  • 基金资助:
    国家自然科学基金

STUDIES ON SUPERHIGH SENSITIVE COLOUR REACTIONS AND THEIR APPLICATIONSⅤ.HIGH SENSITIVE SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM

Teng Yumin, Xu ShengJie   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1990-01-20 Revised:1990-05-19 Published:1991-04-10 Online:1991-04-10

摘要: 研究了以Cu2+为催化剂的Mo(V)-SCN--ERB+-PVA超高灵敏新显色体系及钼的分光光度测定条件。缔合物的吸收峰在580nm处,表观摩尔吸光系数ε=5.6×106L·mol-1·cm-1。Mo(Ⅵ)含量在0~0.3μg/25mL范围内符合比耳定律。初步研讨了显色反应的机理。结合离子交换分离,本法可成功地用于水样及麦饭石浸出液中痕量钼的测定。

关键词: 钼, 乙基罗丹明B, 分光光度法, 超高灵敏显色反应

Abstract: A superhigh sensitive spectrophotometric method has been developed for determinationof trace molybdenum, based on the formation of a complicated ion-associated complex ofmolybdenum with ethyl rhodamine B (ERB) and thiocyanate in the presence of polyvinylalcohol (PVA124).Cu2+ was used to catalyze the reduction of Mo(Ⅵ) to Mo(Ⅴ) carriedout by thiocyanate in Mo(Ⅴ)-SCN--basic dye system.The ion-associate exhibits maximumabsorption at 580nm, its apparent molar absorptivity is 5.6×106 L·mol-1·cm-1.Beer's law isobeyed for 0~0.3μg/25mL of Mo(Ⅵ).The reaction mechanism has been discussed.The method has been used for the determination of trace Mo in water and in leaching solutionof Maifan stone with satisfactory results.

Key words: superhigh sensitive colour reaction, molybdenum, ethyl rhodamine B, spectrophotometry