Li, G., Wei, Q., Hu, Q., Huang, Z. and Yang, G. (2007) Simultaneous Determination of Vanadium, Niobium and Tantalum by High-Performance Liquid Chromatography Equipped with On-Line Enrichment Using 2-[2-(5-Bromoquino- linylazo)]-5-diethylaminophenol as Precolumn Derivatization Reagent. Microchimica Acta, 158, 95-102.
http://dx.doi.org/10.1007/s00604-006-0667-x

has been cited by the following article:

• TITLE: Spectroscopic Investigation of the Complex Formation of Niobium Using 2,6-Dithiolphenol and Aminophenols

  AUTHORS: Kerim A. Kuliyev, Nailya A. Verdizadeh

  KEYWORDS: Niobium, Solvent Extraction, Spectrophotometry, Mixed-Ligand Complexes

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.6 No.9, August 21, 2015

  ABSTRACT: A new, simple, precise, selective and sensitive method for the extraction and spectrophotometric determination of niobium has been described. Mixed-ligand complexes of Niobium (V) with 2,6-dithiolphenol (DTP) and aminophenols (AP) have been studied by spectrophotometry. Extraction of mixed-ligand complexes is maximal at pH 3.6 - 5.0. The optimal conditions for the formation and extraction of mixed-ligand compounds have been found. The molar ratio of the reacting species was 1:2:2 (Nb:DTP:AP). The Beer’s law was applicable in the range of 0.05 - 4.0 μg/ml. The method is free from common interferences. A procedure has been developed for extraction-spectrophotometric determination of Niobium in steel.