Date: Fri Feb 23 10:15:01 2007
Author: Kail Secrest
Subject: Re: Jearl Walker Molten Lead
He was just here a month ago and did the lead and bed of nails. He brings
everything needed to do the molten lead and cloths to catch any possible
splashes. The container he brings has such a small amount of lead that it's
almost negligible. If you are concerned about fumes, just open windows or
doors, and make sure all the vent ducks in the air handling are wide open.
We saw no reason to be concerned here at Ohio Wesleyan. The demonstration
was so short it is unimaginable that small amount of fumes could hurt a
whole audience, or even those close to the demo.
> Hello Tap-l,
> I need quick help this morning. I've just learned that Jearl Walker will
> be visiting my lab today and wants to perform his famous "Hand in Molten
> Lead" demo. I have no idea about the risks involved with how much the
> molten lead will produce in fumes and whether it will create a risk to the
> audience. All I have it the MSDS for lead and the problems with inhaling
> its fumes as I've listed below. Should I allow the experiment or is the
> risk too great for the audience and the possible contamination of my work
> area? Any advice would be greatly appreciated.
> Here is the link to the MSDS for lead and some portions of the text.
> From Page 3 of the MSDS for Lead:
> Enginering Controls:
> "Use process enclosures, local exhaust ventilation, or other engineering
> controls to keep airborne levels below recommended exposure limits. If
> user operations generate dust, fume or mist, use ventilation to keep
> exposure to airborne contaminants below the exposure limit.
> Personal Protection: Safety glasses. Lab coat. Dust respirator. Be sure
> to use an approved/certified respirator or equivalent. Gloves.
> Personal Protection in Case of a Large Spill: Splash goggles. Full suit.
> Dust respirator. Boots. Gloves. A self contained breathing apparatus
> should be used to avoid inhalation of the product. Suggested protective
> clothing might not be sufficient; consult a specialist BEFORE handling
> this product.
> Exposure Limits: TWA: 0.05 (mg/m3) from ACGIH (TLV) [United
> States] TWA: 0.05 (mg/m3) from OSHA (PEL) [United States] TWA: 0.03
> (mg/m3) from NIOSH [United States] TWA: 0.05 (mg/m3) [Canada]Consult
> local authorities for acceptable exposure limits.
> >From Page 5 of the MSDS:
> Special Remarks on Other Toxic Effects on Humans:
> "Lead dust or fumes: Can irritate the upper respiratory tract (nose,
> throat) as well as the bronchi and lungsby mechanical action. Lead dust
> can be absorbed through the respiratory system. However, inhaled lead does
> not accumulate in the lungs. All of an inhaled dose is eventually
> abssorbed or transferred to the gastrointestinal tract. Inhalation effects
> of exposure to fumes or dust of inorganic lead may not develop quickly.
> Symptoms may include metallic taste, chest pain, decreased physical
> fitness, fatigue, sleep disturbance, headache, irritability, reduces
> memory, mood and personality changes, aching bones and muscles,
> constipation, abdominal pains, decreasing appetite. Inhalation of large
> amounts may lead to ataxia, deliriuim, convulsions/seizures, coma, and
> death. Lead metal foil, shot, or sheets: Not an inhalation hazard unless
> metal is heated. If metal is heated, fumes will be released. Inhalation of
> these fumes may cause "fume metal fever", which is characterized by
> flu-like symptoms. Symptoms may include metallic taste, fever, nausea,
> vomiting, chills, cough, weakness, chest pain, generalized muscle
> pain/aches, and increased white blood cell count."
> John Mocko
> Senior Teaching Laboratory Specialist (Lecture Demonstrations)
> Department of Physics
> University of Florida
> Gainesville, Fl.