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December 27, 2010

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Andy Mechling

Super Nice Work. Thanks. This story is only beginning to unfold; is my guess.

But Please; why are you so quick to discount the likelihood that the sulfur gases are originating in the FSD? (I work for no one, by the way)

Please don't confuse carbon disulfide and carbonyl sulfide with SO2 or H2S. CS2 and COS are the compounds showing up in the wallboard: correct? These are the more persistent compounds: correct?

CS2 and COS are more challenging to remove from gas streams through various "desulfurization" strategies; and H2S and SO2 are easy to mitigate, by comparison - regardless of which industry we are talking about: correct?

And we know that there are no standards for what goes into wallboard, and only voluntary standards for strength and so on . . .

. . . and you are willing to buy into some story about reclaimed Chinese board as being the likely source??? c'mon.

EPA and CDC apparently say the the FSD should be fine for wallboard . . . but apparently there is also some language to the effect that more efficient and effective desulfurization techniques might change this equation. . . . . well . . . guess what?

please, if you haven;t, read Paul C. Blanc's 2007 book. Chapter 5 is on CS2.

This is the compound nobody wants to talk about. From the tar sands to the shale gas fields to the sour heavy crudes; mitigating this one is turning out to be a bitch.

nobody wants to monitor for this one. ever; when they will, it is very seldom via the ASTM method.

from my perspective, community exposures to low levels of CS2 have now moved indoors also, and they might just as well - as they seem to be welcome just about everywhere else.

Texas' long-term health screening level for CS2 is 1ppb. I suggest there is good reason for a level this low. Florida's standard is another order of magnitude lower.

Is there any monitoring data coming out of Tx that would lead you to believe that communities there (FT Worth etc) stand any chance of compllying here?

I know that EPA, CDC, FDA, AMA, all believe that ongoing community exposures to carbon disulfide gas is not a problem in the U.S..

I'm curious as to exactly WHERE this chemical isn't the problem.

Thanks.

Michael Shaw

Andy--

Thanks for your comments.


1. As far as I know, there is no chamber test data on the American board in question. But, based on the Lawrence Berkeley National Lab tests, CS2 is not an important component. COS shows up more than CS2, but both pale in comparison to H2S and SO2.


2. It is important to note that FGD drywall had been used for years before the tainted drywall mess, and no one ever complained of any odor.


3. Besides, it is quite likely that many of the control samples used by LBNL were FGD drywall.


4. There is considerable toxicological data on CS2
http://www.atsdr.cdc.gov/ToxProfiles/TP.asp?id=474&tid=84


5. As to reclaimed Chinese board, the fact is that such a theory goes a long way in explaining this phenomenon, and it makes sense in light of the LBNL testing. Remember, the American manufacturers were encouraged to use the reclaimed board.

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