BRIEFS arching s c i ^ " ^ e r !
_
Off-Line Optimization of Gas Chromatographic Temperature Programs 2420 R e s u l t s from t h e c o m p u t a t i o n a l optimization agree w i t h exp e r i m e n t a l optimizations. O p t i m i z a t i o n behavior near t h e limits of allowable settings is discussed, a n d r e c o m m e n d a tions are m a d e for its handling. Eric V. Dose, Environmental Science and Engineering, Inc., Gainesville, Fla. 32602 Anal. Chem., 59 (1987)
Statistical Approach to Solvent Selection as Applied to TwoDimensional Thin-Layer Chromatography 2424
Your FREE STN Mentor"" introductory tutorial (for IBM PC and 1 0 0 % compatibles) will show you how to search online databases for information about biochemistry, biotechnology, chemistry, drugs, materials, superconductivity, food, environmental concerns, analytical techniques, energy, polymers and more! Send for your FREE STN Mentor tutorial and more information. Call or write. STN International ® c/o Chemical Abstracts Service Customer Service, Dept. 33987 P.O. Box 3 0 1 2 Columbus, Ohio 4 3 2 1 0 U.S.A. (800) 848-6538 (TELEX: 6842086)
STN MENTOR™
WONDERSCIENCE
A m e t h o d is described for predicting t h e probability t h a t a given solvent system is t h e b e s t of a set of solvent systems for separating a given m i x t u r e of solutes by two-dimensional thin-layer c h r o m a t o g r a p h y . David Nurok* and S o h r a b Habibi-Goudarzi, Department of Chemistry, Indiana University-Purdue University at Indianapolis, P.O. Box 647, Indianapolis, Ind. 46223, and Robert Kleyle, Department of Mathematical Sciences, Indiana University-Purdue University at Indianapolis, P.O. Box 647, Indianapolis, Ind. 46223 Anal. Chem., 59 (1987)
Preparation and Evaluation of Slurry-Packed Capillary Columns for Normal-Phase Liquid Chromatography 2428 P a c k i n g p r o c e d u r e s for obtaining high-efficiency LC microcolumns with silica a n d polar chemically b o n d e d p h a s e s of t h e diol, cyano, a n d a m i n o t y p e are described. F r a n c a Andreolini, Claudio B o r r a , and Milos Novotny*, Department of Chemistry, Indiana University, Bloomington, Ind. 47405 Anal. Chem., 59 (1987)
Correspondence Storage Stability of Formaldehyde Solutions Containing Pararosaniline Reagent
2432
P a r i s E. Georghiou*, Department of Chemistry, Memorial University, St. John's, Newfoundland, Canada A1B 3X7, and Linda Winsor, Geortec, Ltd., 58 LeMarchant Road, St. John's, Newfoundland, Canada A1C 2G8, and Cliffe J . Shirtliffe and J a n a Svec, Institute for Research in Construction, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6 Anal. Chem., 59 (1987)
Fun Physical Science Activities for Children and Adults to Do Together • • • • •
colorful comic book format useful at home or in classrooms reinforces language and math skills relates science concepts to technology aimed at 4th through 6th graders Price per subscription (one-year, four-issues)
To continental U.S. addresses
To addresses outside the continental U.S.
1-4 5_19
$4.00 each $3.00each
20 or more
$2.00 each
50 or more (minimum)
$3.00 each
1,1,3,3-Tetramethyl-1,3-bis(octadecyl)disiloxane. an Artifact Found on Octadecylsilica-Packed Chromatography Columns 2435 Uffe Anthoni, Charles Larsen, P e r Halfdan Nielsen, and Carsten Christophersen*, Marine Chemistry Section, The H. C. 0rsted Institute, University of Copenhagen, Universitetsparken 5, DK2100 Copenhagen, Denmark Anal. Chem., 59 (1987)
For subscription information write or call: American Chemical Society Prehigh School Science Program 1155 Sixteenth St., N.W. Washington, DC 20036 (202)452-2113
1128 A · ANALYTICAL CHEMISTRY, VOL. 59, NO. 19, OCTOBER 1, 1987
