From: Eugene Ngai <eugene_ngai**At_Symbol_Here**COMCAST.NET>
Subject: Re: [DCHAS-L] Is lead sheeting a source of lead dust? And-Chemical Exposure question...
Date: Mon, 29 Jul 2019 10:56:03 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 00aa01d5461d$bf2422b0$3d6c6810$**At_Symbol_Here**comcast.net
In-Reply-To <60D4438D-47B1-45FF-A19D-480ACEED5CDF**At_Symbol_Here**helixenv.com>


The EPA banned the use of tetraethyl lead to boost octane in gasoline in 1971. That was when all of the car engines were lowered from high compression ratios of 10-1 to 8-1 to accommodate the lower octane values. As a young college student I was a Co-op student at Citgo Research involved in the test program for many summers. The lead prevented “knock” which is premature ignition and also lubricated the cylinder valves. Lead was also a poison for the catalytic mufflers that were being developed. It was a very interesting time as the EPA was just formed in 1970.

 

Eugene Ngai

Chemically Speaking LLC

www.chemicallyspeakingllc.com

 

 

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Ralph Froehlich
Sent: Monday, July 29, 2019 8:57 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Is lead sheeting a source of lead dust? And-Chemical Exposure question...

 

Lead is ubiquitous in the environment due to ethyl lead used in gasoline. The closer to a roadway, the higher the lead concentration in dust and soil. There are many other sources of lead including lead in paints, lead-containing pesticides, lead in weights and shot, glass and glazing compounds, etc. Almost everywhere you look, you should be able to find lead.


Ralph A. Froehlich, CIH, CSP, QEP
Helix Environmental, Inc. 
(937) 226-0650 office
rfroehlich**At_Symbol_Here**helixenv.com

The information contained in this electronic transmission is intended solely  for the recipient of this email. This electronic mail transmission may contain confidential or privileged information. If you have received this email in error, then any distribution, reading, copying, or use of this communication is strictly prohibited. Please notify us immediately of the error by phone or email. Thank you. helix**At_Symbol_Here**helixenv.com

 

On Jul 26, 2019, at 6:09 PM, Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> wrote:



Beautiful Dreamer, List to my song.  

 

All the ground around buildings with lead roofs and lead/copper sheeting is usually high in lead.  I know from the building restoration projects I've been involved in.  And there was a big move a few years ago to continue to install lead roofs because they were what was here originally.  Bad idea. There are now stainless steel roofing materials that will last MUCH longer and don't release anywhere near the amounts of metals and no lead.

 

One of the reason they have to replace the lead roofing and flashing every 30 years or so is it has corroded way in spots or has thinned.  Where do you think that lead went?

 

 And the restorers on these projects do NOT publish the data on the soil around the building.  But I've seen it.

 

Monona

-----Original Message-----
From: Peter Zavon <pzavon**At_Symbol_Here**ROCHESTER.RR.COM>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Fri, Jul 26, 2019 5:23 pm
Subject: Re: [DCHAS-L] Is lead sheeting a source of lead dust? And-Chemical Exposure question...

You can see the “stains” on older roofs where lead sheeting is used like that. Moss and other things do not grow where lead has “run off” during rain events.  Often I’ve noted that the “stain” does not reach to edge of the roof, so perhaps the lead does not get to the ground in toxic amounts.

 

 

 

 

From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Hadden, Susan [JRDUS]
Sent: Friday, July 26, 2019 1:12 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Is lead sheeting a source of lead dust? And-Chemical Exposure question...

 

Decades ago, when I was still a chemist, I had the same question. I purchased a book called First Aid for Chemical Accidents (or something to that effect) by a French author (I think).

If memory serves me correct, it said flush with water for everything, even water reactives. I think I remember it saying “…the flames will die down…”.

 

Don’t know about the lead but I just got a new roof and they installed lead “sheets” to “flash” around the vent pipes because they can mold it over the top and down the sides without a horizontal seam. I see the same thing in use at my workplace. I wonder about run off over the years into the surrounding soil and if that is a solution we may regret years later.

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Margaret Rakas
Sent: Friday, July 26, 2019 12:06 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [EXTERNAL] [DCHAS-L] Is lead sheeting a source of lead dust? And-Chemical Exposure question...

 

So...two questions for Friday...

 

1) If you found a large stack of lead sheets...sitting in a storage area for some time (who knows how long!?)...would you be concerned about lead dust in the immediate area, say the surrounding floor?  I understand that grinding, sanding, filing, etc creates lead dust but this situation doesn't fit any of those...I cannot find any references so in case I'm imagining that just because it's soft, dust forms over time....I wanted to check...

 

2) A student asked me if there were any chemicals for which you would NOT want to use water in case of chemical exposure.  I did a quick search and the Canadian CCOHS (their OSHA) advises "...Note that the manufacturer/supplier .. may recommend an alternative agent in exceptional cases if water is clearly inappropriate."  I have read plenty of SDS's in my time but have never seen an SDS state anything other than using water as the first step.  Has anyone ever encountered any other initial instructions for dermal or eye exposure?  (Of course there may be additional steps AFTER water flushing, like use of calcium gluconate gel, etc)...

 

MANY THANKS and happy Friday to all!
Margaret

 

 

--

Margaret A. Rakas, Ph.D.
Lab Safety & Compliance Director
Clark Science Center
413-585-3877 (p)

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