Dear CHAS Members,

I’m looking for some advice and information.  Before dismantling for disposal, do you have a standard practice of testing regular Laboratory Chemical Fume hoods ducts for the presence of perchlorates?   (I’m not talking about Perchloric Acid Fume hood here). The question arises because for many hoods, the history of usage is not known and in the past unknowingly users may have used such fume hoods for heating perchloric acid in ashing procedures.  We have a number of old fume hoods dismantled and replaced by new ones, so far without any problems.  I would very much appreciate your advice.

Sincerely,

Prabhat Goswami  

Prabhat C. Goswami, Ph.D.

Biological and Chemical Safety Coordinator

Environmental Health and Safety Office

191 Frank Kennedy Centre

University of Manitoba

Winnipeg, Manitoba R3T 2N2

Canada

Tel: (204) 474-8791

FAX: (204) 474-7629