Art,
Good reference.
I would make an edit, that Copper not be lumped with Lead and Mercury.
It is also a nutrient.
http://en.wikipedia.org/wiki/Copper_in_health
Alex
On 01/02/2013 6:41 PM, Art Donnelly wrote:
Hey,
Having spenr many years doing Art casting and welding I had to learn
about this subject. Also I get asked about this frequently, because we
have a galvanized secondary-air shroud on the Estufa Finca.
The following is copied from a welders safety manual:
When zinc vapor mixes with the oxygen in the air, it reacts instantly
to become zinc oxide. This is the same white powder that you see on
some noses at the beach and the slopes. Zinc oxide is non-toxic and
non carcinogenic. Extensive research1 into the effects of zinc oxide
fumes has been done, and although breathing those fumes will cause
welders to think that they have the flu in a bad way, there are no
long-term health effects. Zinc oxide that is inhaled is simply
absorbed and eliminated by the body without complications or chronic
effects. Current research2 on zinc oxide fumes is concentrated in
establishing the mechanism by which zinc oxide causes "metal fume
fever," how its effects are self-limiting and why zinc oxide fume
effects ameliorate after the first day of exposure even though the
welder may continue to be exposed to zinc during subsequent days
("Monday-morning fever"). Other research3 is being done using zinc
oxide fumes together with various drugs which results in a synergetic
effect for treatment of cancer and AIDS. Another area of research is
use of zinc compounds as the active ingredients in throat lozengers
that are recognized as significantly effective in reducing the
duration and intensity of the common cold.
Typical “metal fume fever” begins about 4 hours after exposure, and
full recovery occurs within 48 hours. The symptoms include fever,
chills, thirst, headache and nausea. All of these symptoms, pain and
suffering, as well as lost work (and play) time, can be avoided
entirely by simply not inhaling the zinc oxide fumes. This can easily
be done using any of the methods described later.
Unlike other heavy metals, such as copper, lead and mercury, zinc is
an essential micro nutrient. Zinc is essential to the proper growth of
plants and animals. Zinc forms part of the enzyme system that
regulates biological processes throughout the body. As shown on any
multi-vitamin/mineral bottle, the recommended minimum adult intake is
15 mg/day.
You still have to vaporize the zinc and I sorry but none of our stoves
is getting that hot.
saludos,
Art Donnelly
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