Tungsten Compounds Toxicology
By Edouard Bastarache
Synonym :
Wolfram
Compounds :
-Tungsten carbide,
-Tungsten sulfide,
-Tungsten carbonyl,
-Tungsten chloride,
-Tungsten fluoride,
-Tungsten oxychloride,
-Tungsten silicide,
-Tungsten oxide,
-Tungstic acid,
-Various tungstates.
Uses :
-In ferrous and nonferrous
alloys,
-filaments in incandescent lamps,
-heating elements,
-welding electrodes,
-manufacture of abrasives and
tools,
-manufacture of textiles and
ceramics.
Tungsten
Trioxide
Introduction
:
CAS Number : 1314-35-8
Molecular Formula : WO3
I-Main Synonyms :
French Names :
Trioxyde de tungstene,
Trioxyde de tungstène.
English Names :
Tungsten trioxide,
Tungstic anhydride,
Tungstic oxide,
Tungstic acid,
Tungsten oxide.
II-Uses and Sources of Emission
:
Manufacture of inorganic
products,
colourant.
Hygiene and safety
:
I-Appearance :
Yellow.
II-Physical Properties
:
Physical State : Solid
Odor : Odorless
Freezing/Melting Point
:1473 deg C
Solubility : Insoluble in water
Specific Gravity/Density
:7.1600
III-Inflammability and
Explosiveness
Inflammability:
This product is non flammable.
Prevention
:
I-Reactivity :
Chemical Stability :
Stable under normal temperatures and
pressures.
Conditions to Avoid :
Incompatible materials, dust generation.
Incompatibilities with Other
Materials :
Chlorine, Chlorine trifluoride, Lithium.
Hazardous Decomposition Products
:
None.
Hazardous Polymerization :
Has not been reported.
II-Handling :
Wash thoroughly after handling. Use only
in a well-ventilated area. Minimize dust generation and
accumulation.
Keep container tightly closed.
III-Storage :
Store in a cool, dry, well-ventilated
area away from incompatible substances.
Keep containers tightly closed.
IV-Accidental Release Measures
:
General Information :
Use proper personal protective
equipment.
Spills/Leaks :
Clean up spills immediately, wearing
appropriate protective equipment. Sweep up, then place into a
suitable container for disposal. Avoid generating dusty
conditions.
Provide ventilation.
V-Waste Disposal :
Dispose according to local and state
regulations.
Toxicology
:
I-LD50 :
Oral, rat : LD50 = 1059 mg/kg.
II-Acute Effects :
Eyes :
May cause eye irritation.
Skin :
May cause skin irritation.
Ingestion :
May cause gastrointestinal irritation
with nausea, vomiting and diarrhea.
May be harmful if swallowed.
Inhalation :
May cause respiratory tract
irritation
III-Chronic Effects :
Prolonged or repeated skin contact may
cause dermatitis.
May cause lung damage.
IV-Effects on development :
No data concerning antenatal development
was found in the consulted documentary sources.
V-Effects on reproduction :
No data concerning reproduction was
found in the consulted documentary sources.
VI-Effects on breast milk :
There is no data concerning its
excretion or detection in milk.
VII-Mutagenicity :
No information found.
VIII-Carcinogenicity :
Not listed by ACGIH, IARC, NTP.
First Aid Measures
:
I-Eyes :
Flush eyes with plenty of water for at
least 15 minutes, occasionally lifting the upper and lower
eyelids. Get medical aid.
II-Skin :
Get medical aid. Flush skin with plenty
of water for at least 15 minutes while removing contaminated
clothing and shoes. Wash clothing before reuse.
III-Ingestion
:
Never give anything by mouth to an
unconscious person. Get medical aid immediately. Do NOT induce
vomiting. If conscious and alert, rinse mouth and drink 2-4
cupfuls of milk or water.
IV-Inhalation :
Remove from exposure and move to fresh
air immediately. If not breathing, give artificial respiration. If
breathing is difficult, give oxygen. Get medical aid.
V-Notes to Physician
:
Treat symptomatically
VI-Antidote :
None reported.
Exposure Controls,
Personal Protection :
I-Engineering Controls
:
Use adequate general or local exhaust
ventilation to keep airborne concentrations below the permissible
exposure limits.
II-Personal Protective Equipment
:
Eyes :
Wear appropriate protective eyeglasses
or chemical safety goggles.
Skin :
Wear appropriate gloves to prevent skin
exposure.
Clothing :
Wear appropriate protective clothing to
minimize contact with skin.
Respirators :
Wear an approved full-facepiece airline
respirator in the positive pressure mode with emergency escape
provisions.
Fire Fighting Measures
:
I-General Information :
As in any fire, wear a self-contained
breathing apparatus in pressure-demand, and full protective gear.
II-Extinguishing Media :
Use water fog, dry chemical, carbon
dioxide, or regular foam.
Ecological Information
:
I-Ecotoxicity :
No data available. No information
available.
II-Environmental :
No information found.
III-Physical :
No information found.
IV-Other :
No information available.
Quebec's Exposure Limits
:
Valeur d'Exposition Moyenne
Pondérée (VEMP) : 5 mg/m³ expressed as W.
References :
1-Occupational Medicine,Carl Zenz,
last edition.
2-Clinical Environmental Health and
Toxic Exposures, Sullivan & Krieger; last edition.
3-Sax's Dangerous Properties of
Industrial Materials, Lewis C., last edition.
4-Toxicologie Industrielle et
Intoxications Professionnelles, Lauwerys R. last
edition.
5-Chemical Hazards of the Workplace,
Proctor & Hughes, 4th edition.
6-CSST-Quebec, Répertoite
Toxicologique.
7- Fischer Scientific, MSDS,
2003.
Edouard Bastarache M.D.
Occupational & Environmental Medicine
Author of "Substitutions for Raw Ceramic Materials"
Tracy, Québec, CANADA
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
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