About This Archive  | DCHAS-L 2017 Index   | DCHAS-L Yearly Index
person wearing a disposable face shield and surgical style mask

Check out Safety Emporium for your N95, N99, and face shield needs.

Previous by Date:
Subject: Re: [DCHAS-L] reactive mixture
Date: Thursday, June 29, 2017 at 11:50:14 AM
Author: Wayne Wolsey <wolsey**At_Symbol_Here**macalester.edu> 		Next by Date:
Subject: Re: [DCHAS-L] reactive mixture
Date: Thu, 29 Jun 2017 12:26:40 -0400
Author: Monona Rossol

From: "Chainani, Edward Torres" <echaina2**At_Symbol_Here**ILLINOIS.EDU>
Subject: Re: [DCHAS-L] reactive mixture
Date: Thu, 29 Jun 2017 16:20:24 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: A4BED4D5-76E4-4494-B8F3-55BD952740C9**At_Symbol_Here**illinois.edu
In-Reply-To


Ellen,


I've had one of our researchers seek my advice in attempting this procedure.  Before doing so, we had reached out to the authors of one paper to get more detailed safety information.  Here's the advice we got:

1. I believe the concentrations were pretty standard (Perchloric 70%, Nitric 70%, Sulfuric 97%), but I suspect that the exact concentration is not that important. 
2. We typically leave it in for about an hour.
3. We used a condenser for recollecting all the evaporated acid, which was pretty effective, and used it in an perchloric acid approved fume hood. We've never had any problems, but of course be careful.

The referenced paper was:
Y. Chu, et al., Nano Lett., 2014, 14 (4), pp 1982-1986
http://pubs.acs.org/doi/abs/10.1021/nl404836p

Our researcher was apparently successful in replicating the experiment.  If I am able to obtain more information from our researcher, I shall reach out to you.


Regards,

Edward Chainani, Ph.D.
Safety Engineer
College of Engineering Office of Safety
University of Illinois Urbana-Champaign
1308 W Green St
Urbana, IL 61801
Phone: (217)244-5594
Email: echaina2**At_Symbol_Here**illinois.edu








On Jun 29, 2017, at 9:53 AM, Ellen M. Sweet <ems325**At_Symbol_Here**CORNELL.EDU> wrote:

Hi everyone,
We have a question from a colleague:
 
I have a researcher who is proposing to reflux a mixture of hot nitric 70%)/ perchloric (70%) and sulfuric acids (95%+) in a 1:2:1 mixture for removal of contamination from diamond surfaces. I was wondering if any of you have experience with a similar process? I'm concerned as there is limited information available for this method (published research data) and the available safety data does not recommend mixing sulfuric and perchloric acids not to mention heating such a mixture. We do have a perchloric acid hood available to the researcher, but I'm looking for a more defined, successfully executed process that can be used as reference in terms of apparatus, parameters such as time, temperature, volumes etc. Any feedback on overall safety considerations are also welcomed J
 
Ellen Sweet
Laboratory Ventilation Specialist
Department of Environmental Health and Safety, Cornell University
American Chemical Society, Division of Chemical Health and Safety
315-730-8896
 
--- For more information about the DCHAS-L e-mail list, contact the Divisional secretary at secretary**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas

Previous post   |  Top of Page   |   Next post


The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to secretary@dchas.org.
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.