We are considering using microwave technology to digest sand and silicate
samples with nitric and hydrofluoric acids. So I am surprised to hear
that digestion with mineral acids should be avoided. Several companies
have microwave digestion models. Are they not safe or not effective?

Cathy

Catherine Koo Ph.D.
South Pacific Chemical Industries, San Bhd
Petaling Jaya, Malaysia

cathy.koo**At_Symbol_Here**spci.com.my

On 6/25/19, 8:32 PM, "ACS Division of Chemical Health and Safety on behalf
of Stuart, Ralph" Ralph.Stuart**At_Symbol_Here**KEENE.EDU> 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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