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Analytical Chemistry Volume 50, No. 10, August 1978 Editor: Herbert A. Laitinen

CONVENIENT, EFFICIENT

Published by AMERICAN CHEMICAL SOCIETY © Copyright 1978 by the American Chemical Society

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MECHANICAL REFRIGERATION

EDITORIAL HEADQUARTERS 1155 Sixteenth St., N.W. Washington, D.C. 20036 Phone: 202-872-4570 Teletype: 710-8220151 Managing Editor: Josephine M. Petruzzi Associate Editor: Andrew A. Husovsky Associate Editor, Easton: Elizabeth R. Rufe Assistant Editors: Barbara Cassatt, Nancy J. Oddenino Editorial Assistant: Andre D'Arcangelo Production Manager: Leroy L. Corcoran Art Director: John V. Sinnett Designer: Alan Kahan Editorial Assistant, Lab Guide: Joanne Mullican

"Custom-fit" COOLING REQUIREMENTS AT OFF-THE-SHELF PRICES . . . AND OPERATE FOR AS LITTLE AS $0.04 AN HOUR. • ACCURATE TEMPERATURE C O N T R O L • CAPACITIES TO 60,000 BTU/HR. (5hp)

OVER 500 MODELS • BARE FRAME • SPLIT-REFRIGERATION • TOTAL SELF-CONTAINED SYSTEMS

• Remote-Operating, Refrigerated Probes that take any shape to -100°C. (FLEXI-COOL,...the standard Dry-Ice replacement) «Extra-Low Temperature Baths, Vapor Traps and Freezer/Chambersto -130°C(MULTI-COOL). · Pack­ aged Recirculation Chillers to 60,000 btu/hr. (RC Series) · Refrigerated Dry Air/Gas Sources to -110°C. (PAC Se­ ries) · Low Temperature Circulation Systems(MULTI-COOL)»Total FreezeDrying Systems to 20 Liters. (FLEXIDRY, MULTI-DRY, MAXI-DRY, DURADRY, TIS-U-DRY).

Advisory Board: Donald H. Anderson, Peter Carr, Velmer Fassel, David Firestone, Kurt F. J. Heinrich, Philip F. Kane, Barry L. Karger, J. Jack Kirkland, Lynn L. Lewis, Marvin Mar goshes, Harry B. Mark, Jr., J. W. Mitchell, Harry L. Pardue, Garry A. Rechnitz, W. D. Shults Instrumentation Advisory Panel: Gary D. Christian, Catherine Fenselau, Nathan Gochman, Gary M. Hieftje, Gary Horlick, Peter J. Kissinger, James N. Little, C. David Miller, Sidney L. Phillips. Contributing Editor: Claude A. Lucchesi Department of Chemistry, Northwestern University, Evanston, III. 60201

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4 AUGUST 1978

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