[Nhcoll-l] Decontamination of herbarium specimens by freezing

Mon Apr 30 11:48:06 EDT 2018

Dear Roxali,

I can imagine that it could indeed have a bad effect the structure of the plant.

We usually decontaminate in a CO2 Chamber here at the museum. This is much safer for all kind of dry objects. If you are not familiar whit this method, maybe try some asking at some local historical museum, the usually do the same procedure for older Artifacts or Textile garment.  

Wish you luck,

*******************************************

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Fabian Neisskenwirth
Zoologischer Präparator
Naturhistorisches Museum der Burgergemeinde Bern
Bernastrasse 15
CH-3005 Bern

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Von: Nhcoll-l [mailto:nhcoll-l-bounces at mailman.yale.edu] Im Auftrag von Roxali Bijmoer
Gesendet: Montag, 30. April 2018 16:58
An: nhcoll-l at mailman.yale.edu
Betreff: [Nhcoll-l] Decontamination of herbarium specimens by freezing

Dear all,

We're working on new collection protocols, trying to write everything down and see if all is up to date. One of the topics is the decontamination by freezing of herbarium specimens.

We are familiar with the herbarium handbook, but do any of you know about recent research on this matter? We decontaminate our herbarium specimens for 72 hours at -30 Celsius. I'm finding varying policies on decontaminating herbarium specimens. From at least 48 hours at -18 to 14 days at -40. Is there a bare minimum of hours that specimens need to be frozen and is freezing at colder temperatures more damaging to the specimens?

Thanks for you help,

Roxali Bijmoer

Collections Manager Herbarium

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