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Previous by Date: Subject: Re: [DCHAS-L] Microwave Synthesizers Date: Tuesday, June 25, 2019 at 8:32:29 AM Author: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>

Next by Date: Subject: Re: [DCHAS-L] [EXT] Re: [DCHAS-L] Letter to the National PTAregarding the rainbow flame demo Date: Tue, 25 Jun 2019 15:09:53 +0000 Author: Monona Rossol

Just a few additional comments. Mostly there is nothing magical about using a microwave. It is just a heating device, but it can heat and cool fast. I have found several reactions that would decompose before I could isolate product, but in the microwave I was able to isolate due to this feature. I like the Biotage bench top reactor. It is designed to handle being over pressurized. I have done this countless times. Just clean up the mess, that is contained, and your back in operation. Also if using the non microwave absorbing solvents, I would just add about 10 to 30 % of a suitable absorbing solvent as a co solvent. It heats a little slower but has always worked for me. DMF is usually my first go to.

Thanks,
Marty

On Jun 25, 2019, at 5:32 AM, Stuart, Ralph wrote:

>>> Microwave is a very robust and time efficient method of heating
>>> 3. Never do acid digestion especially mineral acids.
>
> I remember that about 15 years ago, processes for digesting environmental samples with nitric acid in a microwave were developed to replace digestions that used boiling perchloric acid in a fume hood. Has the thinking on this approach changed?
>
> - Ralph
>
> Ralph Stuart, CIH, CCHO
> Environmental Safety Manager
> Keene State College
> 603 358-2859
>
> ralph.stuart**At_Symbol_Here**keene.edu
>
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