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Below is the
result of your feedback form. It was submitted by
Edouard Bastarache (edouardb@sorel-tracy.qc.ca) on Sunday, November
21, 1999 at 10:32:24
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Vanadium
Pentoxide
What every
potter should know about Vanadium Pentoxide.
Fume is recognized as being generally more toxic than dust because
of the
smaller particle size of fume, which allows more complete penetration
to the small
airways of the lungs.The absorption of V2O5 by inhalation is
nearly 100%.
Poison by ingestion,
inhalation, and other routes of entry(experimental) like
intraperitoneal, sub-cutaneous, intrathecal and intravenous.
Human systemic
effects by inhalation:
-bronchiolar constriction,
-including asthma,
-cough,
-dyspnea(shortness of breath),
-sputum,
-conjonctiva irritation.
A respiratory
irritant.
It causes skin pallor, greenish-black tongue, chest pain, dyspnea,
palpitation,
lung changes.
When ingested
it causes gastrointestinal tract disturbances.
It may also cause a papular skin rash.
An experimental
teratogen, experimental reproductive effects,
mutagenic data.
When heated
to decomposition it emits acrid smoke and irritating fumes of
VOx.
Edouard Bastarache
M.D.(Occupational & Environmental Medicine)
Author of « Substitutions for raw ceramic materials »
edouardb@sorel-tracy.q.ca
http://www.sorel-tracy.qc.ca/~edouardb/
References:
Dangerous Properties of Industrial Materials by Sax and Lewis.
Chemical Hazards of the Workplace by Proctor and Hughes.
Stannous
chloride
There are 2 types of tin chloride:
1-SnCl2 2-SnCl4. According to Robin Hopper's "The Ceramic
Spectrum" the first type(stannous chloride) is the one used
in pottery making.
It is a poison by ingestion, intraperitoneal,
intravenous and subcutaneous routes. Experimental reproductive
effects. Human mutagen data. No evidence of carcinogenic potential.
When heated to decomposition it
emits toxic fumes of CL-. Chlorine, because of its intensely
irritating properties, is rarely the cause of severe industrial
exposure, as the worker is forced to leave the exposure area
before he can be seriously affected. A concentration of 3.5 ppm
produces a detectable odor. 15 ppm produces immediate irritation
of the throat. Concentrations of 50 ppm are dangerous for even
short exposures. 1000 ppm may be fatal even when exposure is
brief.
Edouard Bastarache
M.D.(Occupational & Environmental Medicine)
Author of « Substitutions for raw ceramic materials »
edouardb@sorel-tracy.q.ca
http://www.sorel-tracy.qc.ca/~edouardb/
References: The Ceramic Spectrum,
Hopper Robin. Dangerous Properties of
Industrial Materials, Sax & Lewis. Chemical Hazards of the
Woprkplace,
Proctor & Hughes.
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