Vanadium is precipitated from the strip solution, forming insoluble high-quality ammonium metavanadate
Phosphorus concentration was determined by metavanadate
colourimetry, and potassium concentration was determined by flame photometry.
Various methods have been reported in the literature which includes [BF.sub.3]-Si[O.sub.2] , (1-butyl-3-methyl imidazolium hydrogen sulphate [bmim]HS[O.sub.4]) , Ammonium metavanadate
, pyridinium-based ionic liquid , ionic liquid  and alum .
Vanadium also exists in extracellular fluids in the form of metavanadate
(+5 oxidation state).
: An effective catalyst for synthesis of [alpha]-hydroxyphosphonates.
In order to prepare metal solution, 5 mmol of ammonium metavanadate
(NH4VO3) was dissolved in 30 mL of distilled water with constant stirring by a magnetic stirrer over a period of 5-6 h.
The most effective (and/or toxic) was sodium metavanadate
(NaV[O.sub.3]), whereas vanadyl sulfate showed a relatively mild action.
Cuevas-Arteaga et al., "Corrosion performance of Ni-based alloys in sodium metavanadate
," International Journal of Electrochemical Science, vol.
The synthesis was performed with a 0.468 g (4 mmol) mixture of ammonium metavanadate
in 18 mL of distilled water in an Erlenmeyer flask with magnetic stirring and heated at 70[degrees]C until it was dissolved.
This silver metavanadate
phase remained uniquely with further increase in reaction temperature up to 220[degrees]C.
Calcium and phosphorus concentrations were determined by ethylenediaminetetraacetic acid titration and the ammonium metavanadate
colorimetric method, respectively, and both are presented on the basis of dry-defatted weight .