Anions in non saline waters - Determination of Anions in Natural and Treated Waters - page 322

2.108 Valerate
2.108.1 Ion chromatography
The application of this technique is discussed under multianion analysis in section 12.2.4.
2.109 Vanadate
2.109.1 Spectrophotometric methods
Murthy et al. [872] determined vanadium(IV) and vanadium(V) in water by solvent
extraction of the complexes with 2-hydroxy-acetophenone oxime followed by
spectrophotometry.
Mori [873] described a spectrophotometric method for the determination of vanadate
ion in non saline water which utilised o -hydroxyhydroquinonephthalein as the
complexing agent. Hexadecyltri-methylammonium chloride and L-ascorbic acid serve as
a reducing agent. The method was applied to the determination of total vanadium in the
range of 0-8µg.
2.109.2 Spectrofluorometric method
Bishop [236] has discussed the fluorometric methods for the determination of vanadate.
2.109.3 Chemilumnescence method
Zhang [874] applied chemiluminescence analysis to the determination of vanadium in
non saline waters. Oxidation of thiosulphate by hydrogen peroxide is catalysed by
vanadate (VO 3 − ) and is coupled to the chemiluminescent redox reaction of luminol and
hydrogen peroxide. The detection limit is reported as 4.3×10 −7 µg of vanadium L −1 with a
relative standard deviation of 3.2% at 2µg L −1 vanadium.
2.109.4 Preconcentration
The preconcentration of vanadate is discussed in section 15.1.13.
References
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