Briefs
The soft touch... the all new OMA III family^
Mass Spectral Characterization of Oxygen-Containing Aromatics with Methanol Chemical Ionization 546 Isomeric oxygen-containing aromatics, including phenols, ethers, a n d alcohols, a n d c o m p o u n d s containing more t h a n one oxygen a t o m are differentiated. O x y g e n - s u b s t i t u t e d polycylic a r o m a t i c h y d r o c a r b o n s a r e characterized in a coal-derived liquid. Michelle V. Buchanan, Analytical Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, Tenn. 37831 Anal. Chem.,56 (1984) Interlaboratory Isotopic Ratio Measurement of Nanogram Quantities of Uranium and Plutonium on Resin Beads by Thermal Ionization Mass Spectrometry 550 Forty-five of 70 m e a s u r e m e n t s of major isotopic ratios of u n k n o w n samples p r e p a r e d from s t a n d a r d reference materials are within 0.3% of t h e absolute value. Mass fractionation is t h e principal source of imprecision and inaccuracy. J . D. Fassett* and W. R. Kelly, National Measurement Laboratory, Center for Analytical Chemistry, Inorganic Analytical Research Division, National Bureau of Standards, Washington, D.C. 20234 Anal. Chem.,56 (1984)
T h e n e w e s t Optical M u l t i c h a n n e l Analyzer s y s t e m from E G & G P r i n c e t o n A p p l i e d R e s e a r c h is t h e m o s t powerful e v e r c r e a t e d . T h e M o d e l 1 4 6 0 OMA® III with a soft t o u c h s c r e e n c a n b e o p e r a t e d by simply p o i n t i n g . Plug-in controller c a r d s s u p p o r t all t y p e s of array d e t e c t o r s . T h e 68000-based computer can address megabytes of m e m o r y a n d p e r f o r m c o m p l e x calculations o n t h e s p e c t r a s t o r e d o n t h e t w o floppy disks. Most i m p o r t a n t is t h e e a s e with which r e s e a r c h in R a m a n , L C , R a d i o m e t r y a n d Emission S p e c troscopy can be performed. Options include the B A S I C p r o g r a m m i n g l a n g u a g e a n d h a r d disk. T h e n e w Model 1 4 6 1 D e t e c t o r Interface is ideal for labs which n e e d just t h e e s s e n c e of fast parallel d e t e c t i o n . Easily c o n t r o l l e d from a n y c o m p u t e r t h r o u g h R S 2 3 2 C or G P I B , it also boasts a 6 8 0 0 0 microprocessor a n d expandable RAM. S i m p l y r e m a r k a b l e — t h e n e w O M A III family.
APPLIED
RESEARCH
P.O. BOX 2565 · PRINCETON. NJ 08540. U.S.A. · 609/452-2111 · TELEX: 843409
See us March 27-29 at the 1984 APS Show in Detroit, Ml Booths 54, 55, 56 CIRCLE 64 ON READER SERVICE CARD
D e u t e r i u m - i n d u c e d carbon-13 N M R isotopic shifts, d e u t e r i u m N M R , a n d t h e a t t a c h e d proton test a r e useful tools for t h e characterization of 1:, C- a n d 2 H-labeled coal liquefaction solvents a n d t h e resulting p r o d u c t s . Donald C. Young*, Robert I. McNeil, Donald C. Cronauer, Raphaelle G. Ruberto, and Laurine G. Galya, Gulf Research and Development Co., Pittsburgh, Pa. 15230 Anal. Chem.,56 (1984) Effect of Random Experimental Error on the Generalized Standard Addition Method
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382 A · ANALYTICAL CHEMISTRY, VOL. 56, NO. 3, MARCH 1984
562
T h e effect of e x p e r i m e n t a l error on t h e final results of m u l t i c o m p o n e n t analysis using t h e generalized s t a n d a r d addition m e t h o d is investigated. R e c o m m e n d a t i o n s for optimally precise analysis are m a d e . M a r k G. Moran and Bruce R. Kowalski*, Laboratory for Chemometrics, Department of Chemistry, University of Washington, Seattle, Wash. 98195 Anal. Chem.,56 (1984) Portable Generator for On-Site Calibration of Peroxyacetyl Nitrate Analyzers
EG&G PRINCETON
Characterization of Isotopically Labeled Coal Liquefaction Solvents and Products by Deuterium and Carbon-13 Nuclear Magnetic Resonance Spectrometry 557
569
Peroxyacetyl n i t r a t e ( P A N ) is synthesized a t levels of 2-400 p p b in a c o n s t a n t - o u t p u t portable photochemical flow reactor. Reactor o u t p u t is d e t e r m i n e d by ion c h r o m a t o g r a p h y after alkaline hydrolysis of P A N t o acetate. Daniel Grosjean*, Kochy Fung, J o h n Collins, Jeffrey Harrison, and Edmund Breitung, Environmental Research & Technology, Inc., 2625 Townsgate Road, Westlake Village, Calif. 91361 Anal. Chem.,56 (1984)
