GAS FACTS published periodically for analytical chemists
limit values (TLV's) for haz ardous materials, safety checks, illustrations and des criptions of CGA valve outlets and connections. Reprints of papers discussing safety in handling compressed and li quefied gases are also made Someone once described a available by Scott. And safety laboratory as an accident training workshops can be waiting to happen. Actually, analytical chemists have good held in your own laboratory safety records and also have a to inculcate good practices into newly recruited person unique appreciation for the potency of chemical species at nel and review them for ex perienced bench workers. All very low concentrations. of these materials and activi ties are provided by Scott without charge.
Safety in the laboratory
Information when you need it—fast! Did you know that Scott also has an information hotline? If you have questions about the compatibility of equipment and tubing with certain gases —if the valve outlet on a cylin der doesn't mate with the inlet of a regulator—if you want to know OSHA limits for a g a s call Scott toll-free for guid ance. There is no obligation. Both new and experienced bench And remember too, that you workers can benefit from a Scott can use the same number to gas safety training workshop. order the highest quality cali Suppliers of specialty bration mixtures, pure gases gases have been in the fore and gas handling equipment. front of laboratory safety (If you don't have your per programs. They have actively sonal copy of the Scott cooperated with educators, catalog, request it today.) industrial hygienists and safety personnel in setting up and maintaining high stan INFORMATION HOTLINE: dards in the laboratory. The 800-331-4953 Scott catalog, for example, 8:00AM-5:00PM Eastern time provides lists of threshold In PA: 215-766-8861
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BRIEFS Enantiomeric Resolution and Chiral Recognition of Racemic Nicotine and Nicotine Analogues by 0-Cyclodextrin Complexation. Structure-Enantiomeric Resolution Relationships in Host-Guest Interactions 2120 • Several racemic alkaloids related to nicotine are resolved via high-performance liquid chromatography /3-cyclodextrin complexation. Effects of solute, chromatographic condi tions, and chemical structure on resolutions are evaluated. Jeffrey I. Seeman* and Henry V. Secor, Philip Morris USA Research Center, P.O. Box 26583, Richmond, VA 23261, and Daniel W. Armstrong*, Karen D. Timmons, and Timothy J. Ward, Department of Chemistry, University of Missouri—Rolla, Rolla, MO 65401 Anal. Chem., 60 (1988)
Cyclodextrin-Modified Solvent Extraction for Polynuclear Aromatic Hydrocarbons 2127 Aqueous 7-cyclodextrin modifier is used to promote the extractions of polynuclear aromatic hydrocarbons from or ganic to aqueous phase. Extraction efficiencies are related to guest size and organic solvent characteristics. Lisa A. Blyshak, Thomas M. Rossi, Gabor Patonay, and Isiah M. Warner*, Department of Chemistry, Emory University, Atlan ta, GA 30322 Anal. Chem., 60 (1988)
Separation of Deuteriated Isotopomers of Dopamine by Ion-Pair Reversed-Phase High-Performance Liquid Chromatography 2131 Chromatographic parameters and isotope effects governing the resolution of deuterium isotopomers of dopamine are examined and compared with the factors regulating the reso lution of the chemically distinct entities dopamine, norepi nephrine, and epinephrine. Carolyn F. Masters, Sanford P. Markey, and Ivan N. Mefford*, Laboratory of Clinical Science, National Institute of Mental Health, Building 10, Room 2D46,9000 Rockville Pike, Bethesda, MD 20892, and Mark W. Duncan, Intramural Research Program, National Institute of Neurological and Communicative Disorders and Stroke, 9000 Rockville Pike, Bethesda, MD 20892 Anal. Chem., 60 (1988)
Overtake Phenomena in the Movement Process of Components under Temperature Progamming Gas Chromatography 2135 The movement of a component along a GC column is simu lated by calculating step by step the location χ for a certain time t. Under the condition of temperature programming, overtake phenomena are observed for different amino acid derivatives. Lin Bingcheng*, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, People's Republic of China, and Lin Bingchang, Anshan Institute of Iron and Steel Technology, Anshan, People's Republic of China, and Bernhard Koppenhoefer, Institute of Organic Chemistry, University of Tuebingen, 7400 Tuebingen, Federal Republic of Germany Anal. Chem., 60 (1988)
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1078 A · ANALYTICAL CHEMISTRY, VOL. 60, NO. 19, OCTOBER 1, 1988
