Forwarded from Craig Barney. Environmental programs manager at Stanford EHS
From: "Craig A. Barney" <cbarney**At_Symbol_Here**stanford.edu>
Date: August 10, 2018 at 10:23:20 AM PDT
To: Lawrence M Gibbs <lgibbs**At_Symbol_Here**stanford.edu>
Subject: Re: [DCHAS-L] Dilute Ethidium Bromide Disposal in California
Our limit is 0.4% by weight based on the California Toxicity characteristicThe controversy hinges on not the toxicity but mutagenic propertyCraig
Sent from my toasterDid'nt stanford do some testing on this many moons ago?
Larry
Begin forwarded message:
From: Penny Manisco <pmanisco**At_Symbol_Here**G.HMC.EDU>
Date: August 9, 2018 at 4:37:42 PM PDT
To: <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Subject: [DCHAS-L] Dilute Ethidium Bromide Disposal in California
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchasHello All,
There seems to be varying opinion on how to dispose of very dilute solutions of ethidium bromide. The concentration in question is 0.5 micrograms/ml of buffer. By hazardous waste definition, this would not be considered a hazardous waste, but I believe some of our California universities and colleges recommend filtration of the ethidium bromide before disposal at any concentration.
Any guidance would be very much appreciated.
Sincerely,
--
Penny Manisco,
Chemical Hygiene Officer
Harvey Mudd College
(909)6074217