General Description
A white crystalline powder. Slightly soluble in water and denser than water. Decomposes at 410°F. May release toxic fumes. Moderately toxic. An irritant. Used as a dryer for paints and inks, and for dyes. Loses ammonia upon heating.
Reactivity Profile
Acidic inorganic salts, such as AMMONIUM METAVANADATE(7803-55-6), are generally soluble in water. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions.
Air & Water Reactions
Slightly soluble in water.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Potential Exposure
It is used in the metals industry to
make alloys, chemical reactions, dyes, inks, varnishes,
printing, medicines, and photography.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
First aid
Move victim to fresh air. Call 911 or emergency
medical service. Give artificial respiration if victim
is not breathing. Do not use mouth-to-mouth method
if victim ingested or inhaled the substance; give artificial
respiration with the aid of a pocket mask equipped with
a one-way valve or other proper respiratory medical
device. Administer oxygen if breathing is difficult.
Remove and isolate contaminated clothing and shoes.
In case of contact with substance, immediately flush skin
or eyes with running water for at least 20 minutes.
For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of
exposure (inhalation, ingestion or skin contact) to substance
may be delayed. Ensure that medical personnel are
aware of the material(s) involved and take precautions to
protect themselves. Medical observation is recommended
for 24 to 48 hours after breathing overexposure, as pulmonary
edema may be delayed. As first aid for pulmonary
edema, a doctor or authorized paramedic may consider
administering a drug or other inhalation therapy.
Shipping
UN2859 Ammonium metavanadate, Hazard
Class: 6.1; Labels: 6.1-Poisonous materials.
Incompatibilities
Moisture forms an acidic solution. React
with bases and alkaline material: may generate heat and
release flammable hydrogen gas.
Chemical Properties
Ammonium metavanadate is a white or
slightly yellow crystalline powder. It is an inorganic
acidic salt
Chemical Properties
white or slightly yellow powder or crystals
Uses
In dyeing and printing on woolens; staining wood black; manufacture of vanadium black and "indelible ink"; producing vanadium luster on pottery; as photographic developer; in hematoxylin staining in microscopy; as reagent in analytical chemistry.
Uses
Used in combustion analysis of carbon, hydrogen, and nitrogen
Application
Ammonium metavanadate is a water soluble inorganic acid. It is a cheaply available, mild and efficient catalyst. Its ability to alter female reproduction has been studied in swiss albino mice.
Ammonium metavanadate may be used as a substrate in the synthesis of the following:
silver vanadate (AgVO3) nanorods
manganese vanadate nanobelts
vanadium oxide hydrate semi-microspheres
It may be used as a catalyst in the synthesis of the following:
azalactone derivatives
2,4,5-triaryl-1H-imidazoles
octahydroquinazolinone derivatives
α-hydroxyphosphonates
Preparation
Ammonium metavanadate, NH4VO3, plays an important role in the preparation of vanadium oxides and other ammonium compounds, such as NH4V3O8, (NH4)2V3O8, and NH4V4O10, which were found to possess interesting electrochemical properties.
Synthesis of ammonium metavanadate: Vanadium iron powder and charcoal powder mixed with a certain proportion of granulation for roasting, and the role of liquid alkali to generate sodium vanadate, the clear liquid after concentration, filtration, neutralization with hydrochloric acid to Ph7.5 ~ 8, filtration, filtrate heating to 70 ~ 80 ℃, stirring under the addition of ammonium chloride solution, the precipitate by centrifugal separation, washing, drying, the production of ammonium metavanadate crystals.
tailoring the size and shape-new path for ammonium metavanadate synthesis
Flammability and Explosibility
Nonflammable
Purification Methods
Wash the salt with H2O until free from Cl-ions and dry it in air. It is soluble in H2O (5.18g/100mL at 15o, 10.4g/100mL at 32o) but is more soluble in dilute NH3. It crystallises from conductivity water (20mL/g). When heated at relatively low temperature, it loses H2O and NH3 to give vanadium oxide (V2O5), and at 210o it forms lower oxides. [Baker et al. Inorg Synth III 117 1950.] Its solubility in H2O is 0.52% (15o), 1% (32o) and 1.6% (50o). After washing the technical grade salt with H2O, it had Na, Mn and U at 0.06, 0.2 and 0.1 ppm, respectively. [Brauer in Handbook of Preparative Inorganic Chem (Ed. Brauer) Academic Press Vol II p 1272-1273 1965.]
