Re: [pestlist] anoxic treatment update and more questions

[Alex Roach]

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Hi Nicole
As Pascal mentioned, the temperature is going to be critical in ensuring
that you achieve 100% mortality. When testing powderpost beetles Dr Mark
Gilberg found that it took up to 12 days to kill all stages at 30C and
70RH. You’re using a lower RH than in that test which should reduce the
time, but it takes longer to kill insects at lower temperatures (i.e. up to
6 weeks at 20C). If the temperature where you are treating the objects is
low you will need to increase the temp.
Oxygen scavengers take a number of days to reduce the oxygen level so you
need to allow for this when thinking about treatment time as well.
Regarding the Anobium life cycle, the adults emerge in late spring/ early
summer. This means that there would be minimal risk of cross-infestation as
the borers will be in the larval stage at this time (unless they are from
the southern hemisphere, e.g. Australia, where the beetles are emerging
now).
Best wishes
Alex


On Wed, 3 Jan 2018 at 5:44 am, Pascal Querner  wrote:

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> Hi Nicole,
>
> what temperature do you have for your treatment and what pest (in wood or
> others?). if you have about 25 C and the anoxia systhem is working, you
> should have 0,0 % Oxygen and 3 weeks should be enough. For wood boring
> pests it should be fine also, but they one of are the hardest to kill with
> anoxia.
>
> All the best from Europe,
>
> Pascal
>
> *Gesendet:* Dienstag, 02. Januar 2018 um 18:10 Uhr
> *Von:* "Nicole Grabow" 
> *An:* pestlist@museumpests.net, "AIC Objects Specialty Group Discussion" <
> os...@cool.conservation-us.org>
> *Betreff:* [pestlist] anoxic treatment update and more questions
> This is a message from the Museumpests.net  List.
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> Hello lists (crossposting with OSG and Pests),
> Thank you all for your help and advice in designing an anoxic system. I
> was able to order the RP-K oxygen scavengers direct from Mitsubishi and
> since there were none in stock in all of North America they shipped them
> all the way from Tokyo. My RH is holding at 45%, which is good. Also, a
> very generous colleague has lent us an oxygen detecting system.
>
> I am writing now to ask if anyone - particularly perhaps the bug experts
> on the Pest list - can tell me about the life cycle of the Anobiidae
> family, and if there is any wiggle room on the 21-day recommendation for
> anoxic treatment. The shipment from Japan set us back a few days and we
> will hit the 21-day mark exactly one day after the show opens. What kind of
> risk are we looking at if we choose to take them out after 20 days?
>
> Thanks,
> Nicole
>
>
> Nicole Grabow
>
> Senior Objects Conservator and Preservation Conservator
>
> Midwest Art Conservation Center
>
> 2400 Third Avenue South
> 
>
> 
>
> Minneapolis, MN 55404
> 
>
> (612)870-3129
>
> ngra...@preserveart.org
>
>
>
> *The Midwest Art Conservation Center is a non-profit regional center for
> the preservation and conservation of art and artifacts providing treatment,
> education, and training for museums, historical societies, libraries, other
> cultural institutions as well as public and private clients.*
>
>
>
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>
-- 
*Alex Roach*
*Director*
Modified Atmospheres
*M:* 0414 663 472
ABN: 66 164 577 557


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RE: [pestlist] Anoxic treatment

[Mallinckrodt, Casey (VMFA)]

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We currently use anoxia treatments on an as-needed basis using Mavelseal bags 
we make to the size needed, and Ageless ZPT-2000. We have needed to treat less 
than 10 objects in the last year, most with multiple materials, including 
feathers, and some archaeological wood.

We no longer include indicators- they are unreliable- but with the  small size 
of most of our bags/anoxia chambers it’s possible to observe the 20% reduction 
in volume within the first 24 hours.  I have used a Hobo inside the bag to 
record changes in RH as well.

The RH will drop by a small percentage but NOT  to zero! I have used acid free 
tissue paper as an RH buffer as well as for surface protection, and have used 
silica gel for larger volume or more vulnerable objects.

This is a  reliable if limited solution- it is slow and it cannot be monitored 
exactly,  but is effective and cost effective  for our needs.. We are 
considering a freezer and have access to a tent-system if a larger scale 
treatment is ever needed.

Casey



From: pestlist-ow...@museumpests.net [mailto:pestlist-ow...@museumpests.net] On 
Behalf Of Nicole Grabow
Sent: Tuesday, November 28, 2017 2:04 PM
To: pestlist@museumpests.net
Subject: [pestlist] Anoxic treatment

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I have a couple of questions about anoxic pest treatments using oxygen 
scavengers. I more commonly use low-temperature treatment and I'm more familiar 
with that technique, but I understand the anoxia is recommended for laminate 
structures and painted wood.

My first question is about oxygen indicators. I know that the Ageless 
indicators are prone to failure, but more sophisticated instrumentation is 
expensive. I have received quotes for both the MOCON OpTech Model P and the 
PreSens Fibox 4, but at over $5K they are out of our budget for this fiscal 
year. Does anyone have a less expensive solution, or, alternately, equipment 
that we could rent for a singe project?

My second question has do to with the basic premise that anoxia is safer than 
freezing, and the basis of my concern is relative humidity. With anoxia induced 
by oxygen scavengers (which is the system I have available to me) the RH 
ultimately goes to 0% - or else the scavengers aren’t working. 21 days of this 
does not seem safer than 72 hours of freezing - what am I missing?

Nicole Grabow

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Re: [pestlist] Anoxic treatment (on behalf of Stephan Schafer)

[Cindy_Norum]

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Return Receipt
   
   Your   Re: [pestlist] Anoxic treatment (on behalf of Stephan
   document:  Schafer) 
   
   wascindy_no...@nps.gov  
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RE: [pestlist] Anoxic treatment

[Anderson, Gretchen]

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Dear Sir,

To start with you should take a look at the resources page of the Museum Pest 
web site (http://www.museumpests.net/ ).  That will provide you with a great 
deal of information. The second site I recommend you take a look at is the 
Canadian Conservation Institute's Pest article 
http://www.cci-icc.gc.ca/caringfor-prendresoindes/articles/10agents/chap06-eng.aspx.


Good luck
Gretchen Anderson
Conservator
Carnegie Museum of Natural History
4400 Forbes Ave
Pittsburgh PA 15202
anders...@carnegiemnh.org


From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of ???
Sent: Tuesday, March 27, 2012 8:50 PM
To: pestlist@museumpests.net
Subject: [pestlist] Anoxic treatment

Dear all

I am J.S. OH of The National Folk Museu of Korea and reponsible for IPM of The 
National Folk Museum of Korea.
Now I am investigating the anoxic treatment  of museums around the world.
Does anyone have any information of anoxic treatment(nitrogen or argon, rigid 
wall chamber, bubble etc) of the museums around the world.

Sincerely yours

J.S. OH

Conservation Laboratory
The National Folk Museum of Korea
110-820
1-1 Seojong-Ro Jongro-Gu Seoul
Republic of Korea
Tel 82 2 3704 3276
Fax 82 2 3704 3273
Mail kcomm...@yahoo.co.krmailto:kcomm...@yahoo.co.kr


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