568. Ammonium Vanadate(V)

Nomenclature

CAS number: 7803-55-6
Vanadate (VO31) ammonium (1:1); ammonium metavanadate; ammonium trioxovanadate; vanadic acid (HVO3) ammonium salt.
H4NO3V; mol wt 116.98.
H 3.45%, N 11.97%, O 41.03%, V 43.55%.
NH4VO3.

Description and references

Prepn: Baker et al., Inorg. Synth. 3, 117 (1950). Hydrothermal prepn by reaction of vanadium pentoxide with NH4OH or (NH4)2CO3: L. Kótai et al., Chem. Lett. 35, 384 (2006). Toxicity study: H. F. Smyth et al., Am. Ind. Hyg. Assoc. J. 30, 470 (1969). Thermal decompn study: A. Arya et al., Thermochim. Acta 244, 257 (1994). Use as an oxidant in determn of penicillins: E. A. Ibrahim et al., Talanta 24, 328 (1977); in determn of tricyclic antidepressants: W. Misiuk, J. Pharm. Biomed. Anal. 22, 189 (2000).

Properties

White or slightly yellow, crystalline powder. mp ≈200°. Poisonous. d 2.33. Sol in 165 parts water; more sol in hot water, in dil ammonia. Loses water and ammonia on heating. LD50 orally in rats: 0.16 g/kg (Smyth).

Use

In dyeing and printing on woolens; staining wood black; manuf vanadium black and “indelible ink”; producing vanadium luster on pottery; as photographic developer; in hematoxylin staining in microscopy; in analytical chemistry as an oxidant for spectrophotometric determns and as a reagent in combustion analysis of carbon, hydrogen and nitrogen. Catalyst in organic and inorganic synthesis. In prepn and purification of vanadium compounds.