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C H E M S T R Y EDITOR: ROYCE W. MURRAY University of North Carolina

ASSOCIATE EDITORS: Catherine C. Fenselau, University of Maryland Baltimore County, William S. Hancock, Hewlett Packard, James W. Jorgenson, University of North Carolina, Robert A. Osteryoung, North Carolina State University, Edward S. Yeung, Iowa State University/Ames Laboratory Editorial Headquarters, research section Department of Chemistry Venable and Kenan Laboratories

Analytical Chemistry (ISSN 0003-2700) is published semimonthly by the American Chemical Society, 1155 16th St., N.W., Washington, DC 20036. Preferred postage paid at Washington, DC, and additional mailing offices. Postmaster: Send address changes to Analytical Chemistry, Member & Subscriber Services, P.O. Box 3337, Columbus, OH 43210. Copyright permission: Reprographic copying beyond that permitted by Section 107 or 108 of the U.S. Copyright Act is allowed, provided that the fee of $12.00 per article copy is paid directly to the Copyright Clearance Center (CCC), 222 Rosewood Dr., Danvers, MA 01923, USA. A CCC code printed at the bottom of the first page of an article indicates that ACS owns copyright or has permission to collect the copying fee for that article. A record of that code should accompany payment. Direct reprint permission requests to ACS Copyright Office, Publications Division, 1155 16th St., N.W., Washington, DC 20036. Registered names and trademarks, etc., used in this publication, even without specific indication thereof, are not to be considered unprotected by law.

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Editor: Anna C. Tecson

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Ksirumaiiufi tvicinctgtjf. nuuin Lime Director, Special Publishing


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Analytical Chemistry News & Features, January 1, 1997