oops I forgot the not.
>>> [log in to unmask] 2/10/04 12:57:45 PM >>>
Bruno,
Yes, indoor-generated pollutants are a problem, especially the persistent organic pollutants you discuss in your first email. However, we should NOT forget that outdoor-generated pollutants also pose a risk to collections, especially those not in micro climates. NO2 and NO are still relevant pollutants in all buildings and museums. Anything that can be done to reduce or eliminate them from the museum environment is beneficial for the collection.
Regards,
Cecily
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Cecily M. Grzywacz
Scientist
Analytical Research Team
The Getty Conservation Institute
www.getty.edu/gci
1200 Getty Center Drive, Suite 700
Los Angeles, CA 90049-1684
voice: + 310 440-6260
fax: + 310 440-7711
email: [log in to unmask]
"I think scientists and artists are doing the same thing, which is exploring the world, discovering new ways of looking at the world, and using nature as inspiration." -- Scott Lesh, artist."
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>>> [log in to unmask] 2/10/04 3:22:40 AM >>>
Dear Morten,
thank you very much for this interesting information that could be usefull
in reducing outdoor airborne pollutants. However, this inovative technology
seems to be well adapted to airborne pollutants of Nitrogen-oxides (NOx)
type, wich are not specifically the type of airborne contaminant found in
Museums : aging preservative chemical residues ranging from mercury
dichloride and arseniates for the most ancients to polyaromatic chlorinated
molecules that have to be taken into account together with "usual" indoor
air contaminants such as PBDE flame retardant degradation by-products, DEHP
diethylhydrophtalates from paints and plastics, SCCP small chain
chlorinated paraffins and sometimes organotins in paints, foams and rubbers
as fungicide and preservative.
All these compounds (considering that the HgCl2 and Arseniate exposure risk
has been correctly reduced to acceptable levels in case of ancient
museological collections in natural history, anthropology, wooden objects
etc.) are persistant organic pollutants or endocrin disruptive compounds,
which, eventhough they are rather large molecular weight compounds (with low
vapor pressure at room temperature) can have fragments cleaved by oxydative
degradation (with oxygen, ozone, organic acids, nitrogen oxides) or
hydrolytic degradation (with water from relative humidity). The chemicals
formed from this degradation are necessarily of lower molecular weight and
therefore of much higher vapor pressure (more volatile). They hence may
persistantly contaminate the indoor air both by micro & nanoparticulate
matter and by molecular elements for the most volatile species.
Therefore, eventhough this new technology seem promizing for many potential
applications, specific reduction of the indoor air persistant organic
pollutants (POP's) and endocrin disruptive compounds (EDC's) can be acheived
with other methods that seem to be much more adapted to Museum IAQ concerns.
If some of the Museum IAQ discussion list participants are interested in
data on specific ways to monitor and control the breathing exposure levels
for museums and cultural heritage building staff, please ask.
Best regards,
Bruno G. Bordenave
Researcher in Botany
PhD of the Museum National d'Histoire Naturelle (Paris)
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----- Original Message -----
From: "Ryhl-Svendsen, Morten" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 09, 2004 12:59 PM
Subject: Smog-busting paint
Dear List,
In the latest issue of New Scientist (7 Feb 04) there is a story on a new
air pollution reducing type of paint. Maybe this could be useful also for
museum applications.
I have copied the text from the NS website (below)
regards
Morten ryhl-Svendsen
List-owner, IAQ.dk web master
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