Poisoned herbarium specimens

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Hello,

Is there a mean to determine if a dried specimen has been submitted to
poisoning using toxic stuff as mercuric chloride or DDT.  There is not
indication of such treatment on the sheet but I have some doubt about the
safeness of these specimens.

Thanks in advance for any help.

Martin


******************
Martin Dube, Ph.D., associate professor
Edmundston Campus, University of Moncton
Edmundston, NB, CANADA  E3V 2S8
Tel.: 506-737-5154   Fax : 506-737-5373  ICQ # 37925656
http://www.cuslm.ca/cours/martin/botanique.htm
http://www.cuslm.ca/cours/martin/invertebres.htm