Greetings DistList,
I am working on some standards around pollutants in Museums. In the literature
the standards given can vary greatly depending on who wrote them and in which
country. The units also vary from place to place, which adds to confusion. I
was wondering if people could send me the standards they use?
The numbers I have collected so far are:
Sensitive material, Museums, Action limit.
O3 <0.1g/m3, 1ppb, 2g/m3, 1ppb, 50 g/m3,
SO2 <0.1g/m3, 1g/m3, 1ppb, 20g/m3,
H2S <0.01g/m3, <0.1g/m3, 0.1ppb, 0.5g/m3,
NH3 - 0-200 ppm? 200-500ppb?
NO2 <0.1g/m3, 5g/ m3, 2.65 ppb, 50g/m3,
NOx <0.1g/m3, 10g/m3, 50g/m3,
PM10 - 75g/m3, best
control,
PM2.5 0.1g/m3, 10g/m3, best control,
Cl2 3g/m3, 1ppb, 9g/m3, 3ppb best control,
HCl 1.5g/m3, 1ppb, 4.5g/m3, 3ppb, best control,
CO2 - 1000ppm, 2500ppm,
CO - -
35ppm,
VOCs 100g/m3, 100g/m3, 100ppb, 2500g/m3,
Formic <0.1g/m3, 10g/m3, 5ppb, 38g/m3,
Acetic 5g/m3, 2ppb, 10g/m3, 4ppb, 500 ?g/m3,
Formaldehyde <0.1ppb, 1-5g/m3, 4-10ppb, best control.
(apologies for formatting shifts)
I also found numbers for NO and HNO3, but as NO2, NO and HNO3 are all in
equilibrium in the atmosphere, I figure an NOx number is probably more useful.
Similarly I suspect the Cl2 and the HCl numbers refer to the same thing, and
the only difference is in how it's written, as chlorine gas will rapidly turn
into HCl (or something else) in an atmosphere containing humidity.
The action limits I have come across probably have more to do with human health
than artefacts, but if anyone has any input there, it would also be appreciated.
Thanks
Valerie Tomlinson
Valerie Tomlinson
Auckland War Memorial Museum | Tamaki Paenga Hira
The Domain, Private Bag 92018,
Victoria Street West, Auckland 1142, New Zealand
www.aucklandmuseum.com
P +64 9 306 7070 ext7304
E [email protected]
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