高等学校化学学报

高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (4): 475.

• 论文 • 上一篇    下一篇

稀土元素的电分析化学研究(Ⅵ)——钐-罗丹明B-氯化铵体系的极谱研究

叶宪曾, 高小霞   

  1. 北京大学化学系
  • 收稿日期:1981-03-27 出版日期:1982-12-24 发布日期:1982-12-24

ELECTROANALYTICAL CHEMICAL STUDIES OF RARE EARTH ELEMENTS ( Ⅵ )——POLAROGRAPHIC STUDIES OF SAMARIUM-RHODAMINE B-AMMONIUM CHLORIDE SYSTEM

Ye Xianzeng, Gao Xiaoxia(Kao Sheau-shya)   

  1. Chemistry Department, Peking University, Beijing
  • Received:1981-03-27 Online:1982-12-24 Published:1982-12-24

PDF (PC)

摘要： 在单扫示波极谱仪上,罗丹明B在氯化铵底液中(0.4M)的导数波(-1.45V,SCE)是一个吸附波,加入Sm3+能降低它的波高,二苯胍(1×10-4M)的存在使罗丹明B(8.4×10-5M)的波形稳定,Sm3+浓度为3×10-7—2×10-3M时,浓度与波峰的降低呈线性关系。在直流极谱仪上,在有二氧六圜存在的氯化铵底液中,钐(Ⅲ)-罗丹明B络合物在-1.7V(SCE)有一个吸附还原波。在最佳条件下(0.1M氯化铵,4.2×10-5M罗丹明B和10%二氧六圜,pH=5.0),在浓度为2×10-5—2×10-5M范围内,波高与Sm3+浓度有正比关系。比较了稀土-罗丹明B在二氧六圜中的极谱波,销比钐灵敏,铒最灵敏;但是罗丹明B的吸附波妨碍了在它后面的络合物波的灵敏度进一步提高。

Abstract: The polarographic behavior of rare earths with rhodamine Bin ammonium chloride solution has been further studied with Sm3+ as an another example. (1) In the presence of a small amount of diphenylguanidine, the addition of Sm3+ decreases the height of the adsorptive single-sweep derivative wave( -1.45V, SCE) as in the case of Y3 + does[1] There is a linear relationship between the concentration of 3×10-7-2×10-6M Sm3+ and the decreases of wave heights. (2) In the ammonium chloride solution with 10% dioxane, the complex of Sm3+ -rhodamine Bexhibits a reductive dc pola-rogram at -1.70V (SCE). The wave height is directly proportional to the concentration of Sm3+ within the range of 2×10-6-2×10-5M. Since the adsorptive wave of rhodamine Bprecedes the complex wave, it is hard to further increase the sensitivity either by dc or single-sweep polarography. Acomparison of RE-rhodamine Bcomplexes in dioxane was made in which Eu is more sensitive than Sm and Er is the most sensitive one among them.

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