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Subject: Re: Science Education & Safety
Date: Sat, 9 Oct 2010 08:00:45 -0400
Author: "Norwood, Brad" 		Next by Date:
Subject: Re: Science Education & Safety
Date: Sat, 9 Oct 2010 07:41:52 -0700
Author: DAVID KATZ


Date: Sat, 9 Oct 2010 09:33:19 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Richard W. York" <ryork**At_Symbol_Here**WITTENBERG.EDU>
Subject: Re: Science Education & Safety- substitute for Br in
dichloromethane

We have been using bromine in cyclohexane as a substitute for the unsaturat
ion test.  The reaction of bromine with cyclohexane is so slow that the rea
gent stays usable for several weeks.  Of course, the density of the reagent
 is very different, so many two-phase situations will be reversed.  

Answers.com currently states that bromine is colorless in cyclohexane.  Thi
s is not true.  At least not in short time-frames. 

Richard York
Coordinator of chemistry labs
Wittenberg University
ryork**At_Symbol_Here**wittenberg.edu
________________________________________
From: DCHAS-L Discussion List [DCHAS-L**At_Symbol_Here**LIST.UVM.EDU] On Behalf Of Jamie Smi
th [jsmith107**At_Symbol_Here**IVC.EDU]
Sent: Friday, October 08, 2010 6:40 PM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] Science Education & Safety

Russ,

Thank you!  We=92ve been discussing discontinuing dichloromethane at our co
mmunity college.  We=92ve had some success using petroleum ether for chroma
tography, but are unsure what to use as a substitute for the bromine in dic
hloromethane test for unsaturation.  We have the students use the Baeyer Te
st but would also like to do a bromine test, if possible.

Suggestions from the DCHAS community would be greatly appreciated.

Jamie Smith
Sr. Laboratory Technician
Irvine Valley College
5500 Irvine Center Drive
Irvine, CA  92620
Jsmith107**At_Symbol_Here**ivc.edu


________________________________
From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**list.uvm.edu] On Behalf Of Ru
ssell Vernon
Sent: Friday, October 08, 2010 12:51 PM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L] Science Education & Safety

I found out today that one of our teaching labs is conducted an extraction 
experiment with dichloromethane (caffeine from coffee)
I would like to provide them a reasonable alternative extraction experiment
 with an occupationally regulated carcinogen=85

If you have a recommendation to look at, would you please contact me?
Thanks,
-Russ

Russell Vernon, Ph.D.
Research Safety
Environmental Health & Safety
University of California, Riverside
900 University Ave
Riverside, CA 92521
www.ehs.ucr.edu
russell.vernon**At_Symbol_Here**ucr.edu

Direct (951) 827-5119
Admin (951) 827-5528
Fax (951) 827-5122

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