高等学校化学学报

高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (6): 809.

• 研究简报 • 上一篇    

铌-4,5-二溴苯基萤光酮-表面活性剂显色体系的研究——高灵敏分光光度法测定合金钢中的微量铌

王东进1, 陈建华1, 白建跃1, 潘庆洪2   

  1. 1. 福州大学化学化工系;
    2. 中山大学化学系
  • 收稿日期:1982-07-11 出版日期:1983-12-24 发布日期:1983-12-24

SPECTROPHOTOMETRIC STUDY ON THE COLOUR REACTION OF NIOBIUM-4,5-DIBROMOPHEN-YLFLUORONE-SURFACTANTS SYSTEM AND ITS APPLICATIONS

Wang Dongjin1, Chen Jianhua1, Bai Jianyue1, Pan Qinghong2   

  1. 1. Department of Chemistry, Fuzhou University, Fuzhou;
    2. Department of Chemistry, Zhongshan University, Guangzhou
  • Received:1982-07-11 Online:1983-12-24 Published:1983-12-24

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摘要： 铌的高灵敏度、高选择性的光度法似尚少见。最近有人[1]合成过4,5-二溴苯基萤光酮(下称Br-PF),但至今未见该试剂用于铌的胶束增溶光度法的测定。为此本文较系统地研究了在CTAB及乳化剂OP存在下Nb(V)与Br-PF的显色条件,结果表明本法具有很高的灵敏度(ε=2.1×105)和较高的选择性(存在掩蔽剂),可不经任何分离直接在水相中测定合金钢中的微量铌。

Abstract: A highly sensitive colour reaction of niobium-4,5-dibromophenyl-fluorone(Br-PF)-CTAB-OP surfactants has been investigated spectro-photometrically. The complex of niobium(Ⅴ) is formed in 1.5-3.0N HCl medium. The apparent molar absorptivity is 2.1×105 1 · mol-1 · cm-1 at 540nm. The molar ratio of Nb(Ⅴ) : Br-PF in the complex has been estimated to be 1 : 2. Beer's law is obeyed for niobium in the range of 0-3μg/10ml.Al3+,Zn2+, Cd2+,Mn2+,CO2+,Cu2+,Pb2+ ,Fe3+ , Cr3+-large amounts, V(Ⅴ)170-fold, Cr(Ⅵ) 150-fold, Zr(Ⅳ), Mo(Ⅵ),La3+ , Th4+, Bi3+50-fold and W(Ⅵ)5-fold excess do not interfere with the determination of Nb(Ⅴ) (2μg/10ml), using EDTA, tartrate and +β-dithiocarbaminopro-pionic acid as masking agents.A simple and rapid method is successfully applied to the determination of small amounts of niobium in alloy steels without separating Nb(Ⅴ) from the accompanying elements.

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