VERSATILITY for any system
Briefs
Forged Body General Purpose Valves for regulation and shut-off of liquids and gases.
Using a sample cell p a c k e d with alkylated silica, t h e fluorescence vibronic fine s t r u c t u r e of sorbed p y r e n e is used t o d e t e r m i n e t h e s t a t i o n a r y p h a s e polarity of b o t h polymeric a n d m o n o m e r i c Cig s t a t i o n a r y phases. J . W. C a r r and J . M. Harris*, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 Anal. Chem., 58 (1986)
WHITEY offers you forged body valves for a wide variety of applications involving the regulation and shut-off of gases and liquids... from non-critical vacuum to high pressure. Available materials are 316SS, brass, Monel, steel and aluminum. Maximum pressures to 3000 PSI (20,600 kPa). Maximum temperatures to 450°F (232°C) with virgin TFE packing. Specify them for air lines, natural gas, flow meters, sampling lines, control panels, and for use with machine coolants, drains, vents and pressure gauges. WHITEY Forged Body Valves meet the stringent requirements for laboratory and research facilities. They offer easy installation and dependable performance. Available for prompt delivery from your local full service WHITEY Valve Distributor. MONEL —TM International Nickel / S w i o . ^ A ' - ' — T M Crawford Fitting Company
Fluorescence Studies of the Stationary-Phase Chemical Environment in Reversed-Phase Liquid Chromatography 626
Determination of Reactive Aldehyde Groups Immobilized on Silica Using (p-Nitrophenyl)hydrazine as a Chromophoric Probe 631 A m e t h o d is p r e s e n t e d for t h e d e t e r m i n a t i o n of reactive aldehyde groups immobilized on controlled-pore glass t h a t involves t h e sequential a t t a c h m e n t a n d release of ( p - n i t r o p h e n y l ) h y d r a z i n e as a chromophoric probe. Matthew C. Gosnell and Horacio A. Mottola*, Department of Chemistry, Oklahoma State University, Stillwater, Okla. 74078 Anal. Chem., 58 (1986)
Subambient Temperature High-Performance Liquid Chromatographic Determination of the Enantiomers of (±)-((6,7-Dichloro-2,3-dihydro-2-methyl-1-oxo-2phenyl-1H-inden-5-yl)oxy)acetic Acid 636 ^HSCjÎ
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END CONNECTIONS PATTERNS
Study of the Steam Distillation of Phenolic Compounds Using Ultraviolet Spectrometry 639
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E n a n t i o m e r s are detected a t low microgram-per-milliliter concentrations with an assay accuracy of 2% a n d an R S D of less t h a n 2%. David J . Mazzo*, Carl J . Lindemann, and Gerald S. Brenner, Department of Pharmaceutical Research and Development, Merck Sharp and Dohme Research Laboratories, West Point, Pa. 19486 Anal. Chem., 58 (1986)
S t e a m distillation of 42 phenolic c o m p o u n d s is s t u d i e d using a semimicro s t e a m distillation a p p a r a t u s a n d UV spectrometry. T h e i m p o r t a n c e of b o t h inter- a n d intramolecular hydrogen bonding in c o m p o u n d recovery is examined. George Norwitz, Nicole N a t a r o , and P e t e r N. Keliher*, Department of Chemistry, Villanova University, Villanova, Pa. 19085 Anal. Chem., 58 (1986)
to FEMALE
AGELOK to WAGELOK
STEM TYPES
Sample Pair Modulation Studies of Molecular Fragmentation in Plasmas
642
An a u t o m a t e d gas-sampling loop system a n d differentialstability, sample pair m o d u l a t i o n t e c h n i q u e are p r e s e n t e d for r a p i d m e a s u r e m e n t of t h e degree of organic molecular fragmentation occurring in a t m o s p h e r i c - p r e s s u r e p l a s m a s . Edward E. King and Robert C. Fry*, Department of Chemistry, Willard Hall, Kansas State University, Manhattan, Kan. 66506, and M a a r t e n Van Swaay, Department of Computer Science, Nichols Hall, Kansas State University, Manhattan, Kan. 66506 Anal. Chem., 58 (1986)
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374 A • ANALYTICAL CHEMISTRY, VOL. 58, NO. 3, MARCH 1986
