I don't know if you have yet considered the ceric ammonium nitrate test for alcohols? An alcohol of 6 carbons or less will oxidize to its corresponding carboxylic acid while cerium(IV) reduces to cerium(III) producing its characteristic red color. This test works especially well for water soluble alcohols.
See http://www.astm.org/Standards/E346.htm describing an assay that relies on the oxidation of methanol by permanganate.
I suggest researching the JAOAC for methodology and build a gravimetric calibration curve and determine limit of detection. It might not have anything helpful but there's also "inorganic spot tests" by Fiegl & Anger.
Just some ideas.
Sent from my iPhone
On Jun 28, 2012, at 6:23 PM, "Casparian, Armen" <caspariana**At_Symbol_Here**WIT.EDU> wrote:
Do you or anyone else in the discussion group know of a simple wet, chemical qualitative method for detecting the presence of methanol in an aqueous solution? The exact concentration is not necessary but a relative/comparative concentration would be nice. In particular, I would like to monitor the methanol concentration as aspartame decomposes over time in soft drinks, suitable for an undergraduate laboratory experiment. I suppose FDA must have protocol for this, but their method may involve the use of a GC-FID.
LABSAFETY-L is the internet discussion list of the Laboratory Safety Institute (LSI). It provides an open forum for the discussion lab safety questions,concerns, and ideas. Information about subscribing can be found at http://www.labsafetyinstitute.org/Resources.html.
As moderator of the list, I can assist anyone who has questions or would like assistance subscribing.
Regards, ... Jim
James A. Kaufman, Ph.D.
Chair, ICASE Committee on Safety in Science Education
International Council for Associations of Science Education
The Laboratory Safety Institute (LSI)
A Nonprofit International Organization for
Safety in Science and Science Education
192 Worcester Road, Natick, MA 01760-2252
508-647-1900 Fax: 508-647-0062 Skype: labsafe
Cell: 508-574-6264 Res: 781-237-1335
P We thank you for printing this e-mail only if it is necessary
Previous post | Top of Page | Next post