Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume 37, Number
8, August 1999, pp. 306-311
Simultaneous
Determination of Trace Amounts of Vanadium and Cobalt in Steel and Environmental
Materials with 2-(5-nitro-2-pyridylazo)-5 [N-n-propyl-N-(3-sulfopropyl)amino]phenol
by Reversed-Phase High-Performance Liquid Chromatography
Bing
Chen, Qiangbin Zhang, Hirotsugu Minami, Sadanobu Inoue, and Masayuki Uto2-(5-Nitro-2-pyridylazo)-5-[N-n-propyl-N-(3-sulfopropyl)amino]phenol
(Nitro-PAPS) is used as a precolumn chelating reagent for the reversed-phase high-performance
liquid chromatographic separation and simultaneous determination of vanadium and
cobalt. The metal-Nitro-PAPS chelates are separated on an ODS column with acetonitrile–water
(55:45) containing 0.01 mol dm–3 acetic acid, 0.01 mol dm–3 tetrabutylammonium
bromide (TBA+Br–), and 10–4 mol dm–3 EDTA as an eluent. In this
method, the vanadium and cobalt can be determined selectively at the sub-parts-per-billion
level without any preliminary concentration and separation. The detection limits,
defined as the concentrations equivalent to 3 times the standard deviation of
the blank signal, are 17 ppt for vanadium and 55 ppt for cobalt at 0.002 absorbance
unit full scale (593 nm). These results suggest that vanadium and cobalt in steel
and environmental materials can be successfully determined without preseparation
and preconcentration of these metal ions.
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