Date: Wed, 8 Aug 2007 10:33:15 -0400
Reply-To: Don Wanamaker <dwanamaker**At_Symbol_Here**EMLWEB.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Don Wanamaker <dwanamaker**At_Symbol_Here**EMLWEB.COM>
Organization: Environmental Management, Ltd.
Subject: Question for R. Stuart

I have an issue with possible sulfur interference in connection with analytical Method 1664 A (SGT-HEM), determining non-polar material (NPM). Yellow crystals form in some of our samples. It is not clear if the crystals are a result of acidification (as required by the Method) of samples containing certain sulfur compounds (like ammonium thiosulfate), or from some other source. I know that the final residue (which is weighed as NPM) is a yellow powder that contains elemental sulfur. Does anyone have information about sulfur and NPM analysis, or a modification to Method 1664 A when there may be sulfur interference?  I'd appreciate any help you can give me.

Thank you,
Don Wanamaker
American Chemical Society Member #01158318
Environmental Management, Ltd.

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