I can only answer question number one: I have worked in pharma and in manufacturing chemistry QA and R&D labs over the past decade and have NEVER used a sink aspirator for filtering powders. We always had a house vacuum or vacuum pump set-up for filtering. I finished grad school four years ago and we never used a sink aspirator for filtering in my research lab. We very rarely used them in the teaching labs. I think both my graduate and undergraduate institutions are moving away from sink aspirators for a number of reasons: the waste issue you mention here, the potential for sink overflows, the ridiculous waste of water, and even the noise level when lots of students are using them in a large teaching lab.
I also agree with someone else’s comment about Fisher or VWR. If a google search doesn’t turn up what I want right away, I usually call our Fisher rep and let him do the leg work for me. He’s never let me down.
Good luck, and do let us know if you come up with an effective response to the but-we’ve-always-done-it-that-way PhD chemists!
Katherine C. House, CCHO
Chemical Hygiene Officer
Cormetech Environmental Technologies, Inc.
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From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Kim Auletta
Sent: Tuesday, December 04, 2012 8:27 AM
Subject: [DCHAS-L] water aspirator - vacuum question
I need the expert opinion of chemists working with 21st century ideas!
I was in a lab yesterday in Chemistry that is run by a PI older than the hills. His lab is filtering powders and solvents using the sink aspirator. All of the tygon tubing (both sides of vacuum & flasks) is discolored and shows signs of deterioration. They say this tubing is only looking that way because its really old. There was a flask for trap set up between the sample & the sink. I tried to explain that this set up may be allowing solvents to go into the water & down the drain. They tried in their best "I'm the seasoned PhD Chemist and you're not" voices to tell me it was ok and that there was no other way to do this and that everyone, including in industry, does it this way. Really?
So - my questions to all of you enlightened chemists:
1. Do you still use the sink aspirator/vacuum?
2. If so, what kind of trap do you use to prevent solvent or other hazardous material (liquid & vapor) from going down the drain?
3. If you no longer use this filter/vacuum set up, what do you use?
thanks for your help!
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