We also need to worry about the chemicals/impurities collected into base bath during cleaning process.
I agree with your conclusion James, but note that there is a PEL for isopropyl alcohol. It's 400 ppm. The ACGIH TLV is 200, with a short term limit of 400 ppm. The corrosive hazard is indeed the thing that's more likely to hurt someone.
Donald Abramowitz, CIH
Environmental Health & Safety Officer
Bryn Mawr College
Bryn Mawr, PA
Risk Assessment: Flammable (LOW RISK) and Corrosive (HIGH RISK).
Not sure of the LEL for IPA, but I would evaluate possible ignition sources with he researchers, hood or not.
As for exposure risk to the researchers, there is no PEL for IPA and most would balk at anyone complaining about breathing is dilute vapors of IPA. What you have to be concerned with here is the severe caustic hazard. Ensure proper eye protection and a compliant eye wash (hands free, bi-ocular, operated with one motion, and 60F min for 15 min). The Guardian - Model G5022 is a nice unit if you need to purchase one (~$250) and can core drill you bench-top. Skin exposure will dehydrate the skin and cause dermatitis quickly.
As for the sink drains, you must protect all drains (consider floor drains too). I would use good secondary containment and do not store in the sink (avoid on the bench-top next to the sink when possible). Have spill pads and a spill kit with alkali neutralizer. Again, use secondary containment, you may need large carboys and large funnels to bulk this up for waste disposal when the bath is spent.
Depending on the size, shape of the container, seal of the closure, and process, you may still need a fume hood. Have the researchers participate in the risk assessment, and come to the best solution with their input. I know many labs to use base baths without taking up valuable real estate in the fume hood.
James F. Saccardo, CHMM?
From: DCHAS-L Discussion List <dchas-l**At_Symbol_Here**med.cornell.edu> on behalf of Julie and Rob McLachlan <mclachlanrj**At_Symbol_Here**SYMPATICO.CA>
Sent: Wednesday, February 24, 2016 10:04 AM
Subject: Re: [DCHAS-L] Base baths outside a fume hood
Please look at the flammability of the Isopropanol. We put our base bath in a Rubbermaid tote in a fire proof bin. Look for parts cleaner or rinse or dip tank safety containers.
You also need good ventilation when using it, but we found it was okay close to a fume hood, but not in the fume hood.
We frequently see base baths located outside of fume hoods. If they are covered and secure we haven't objected to this in the past.
What are your opinions regarding placement of base baths outside fume hoods, near sinks, and on the floor in 5-gallon buckets?
Christopher E. Kohler, MS, LPG, CCHO
Laboratory Safety Manager, EHS
Laboratory Safety Instructor, ACS
Adjunct Faculty, SPEA
Environmental Health and Safety
1514 E Third Street
Bloomington, IN 47405
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