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Subject:

Re: Alternatives to Smog-busting paint

From:

bruno <[log in to unmask]>

Reply-To:

Indoor Air Quality in Museums and Cultural Heritage Buildings <[log in to unmask]>

Date:

Tue, 10 Feb 2004 14:14:15 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (149 lines)

Hello Jerry and thank very much you for these relevant informations,

Air filtration together with negative air pressure devices enabling to
isolate pollutant rich collections from permanent working spaces is indeed
part of the main tools we can rely on to resolve museum indoor air quality
concerns.

However, activated carcoal and potassium permanganate has been tested but it
quickly reach saturation point (this due to the indoor relative humidity)
versus all lipotropic (hydrophobous) airborne persistant pollutants and
EDC's. And they show a strong desorption for these contaminants as soon as
the airflow is interupted, cancelling most of the benefits of the air
purification.

There is a more aimed way to catch and neutralize these species of indoor
air lipotropic pollutants that are more specifically found in museums and
national heritage buildings (although they also may be found in domestic and
other occupational indoors too). This new method reproducing and amplifying
the depollution ability of forest foliage as an air purification technique
is patented, simple and very effective (with first chemical validation
ready). I may explain it briefly if you wish.

Microclimate Technologies International may be interested, along with
managers of museums and national heritage buildings who wish to reduce staff
exposure to cumulative harmfull indoor airborne micropollutants.

Best regards,

Bruno Bordenave

----- Original Message -----
From: "Jerry Shiner" <[log in to unmask]>
To: "Indoor Air Quality in Museums and Cultural Heritage Buildings"
<[log in to unmask]>; <[log in to unmask]>
Cc: <[log in to unmask]>
Sent: Tuesday, February 10, 2004 1:54 PM
Subject: Alternatives to Smog-busting paint


Hello to the list members:

This discussion occurs at an interesting time for Microclimate Technologies,
as we are currently developing a series of pollution control devices.
Some of these pollutant filters will function as accessories to our
microclimate generators, others will be self contained devices.

At this point, all our prototypes consist of a combination of pumps, fans
and filters to either:
1. recycle enclosure air through a series of pollutant filters and back to
the enclosure, or
2 to force filtered air into an enclosure, and then maintain a slight
positive pressure balance inside the enclosure

We are looking for direction and comments from the conservation community as
to the "best case" filtration. That is: Ideally, what would you filter out,
and what elements /materials would you use for the filtering?

The "best case" scenario will likely be beyond our reach at a reasonable
cost (it usually is!), so we are also looking for a compromise solution.

At this point we are experimenting with activated charcoal (with potassium
permanganate), along with relatively fine particulate filters.

We are VERY interested in suggestions from the IAQ group for filtering
parameters and devices.

Thank you all in advance for your suggestions- any and all comments will be
gratefully received!!!
- hope to see many of you in Padova next fall

js
Jerry Shiner
Keepsafe Systems; for low oxygen environments, and
Microclimate Technologies International; for active humidity and temperature
control in museum enclosures
[log in to unmask]         www.keepsafe.ca        www.microclimate.ca
800 683 4696  416 703 4696

-----Original Message-----
From: Indoor Air Quality in Museums and Cultural Heritage Buildings
Sent: 2/10/2004 6:22 AM
To: [log in to unmask]
Subject: Re: Smog-busting paint


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)

[log in to unmask]


----- 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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