Hotpack Corporation

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Briefs

"TZStëcûdl· ΟΕΗΞΖ3Ξ22ΣΠ LABORATORY/INDUSTRIAL OVENS All types. One to 96 cu. ft. capacities. Digital display of temperatures up to 350°C. Digimatec proportional solid state temperature controls. Bench top, floor models, passthrough, truck-in models.

If you need an oven, any kind, Hotpack has It. Or, we'll build It. We have the widest selection of laboratory/industrial ovens you'll find for baking, drying, aging, curing, steriliz­ ing, life testing, burn-in, whatever. If we don't have the par­ ticular specifications you need, we'll build it for you, custom. Call Hotpack today for your FREE literature packet. Hotpack works...with you...direct. Custom systems? Modifications? We'll engineer to your needs. Call us toll free

800-523-3608 or 215-824-1700 in Pennsylvania

Dutton Rd. Philadelphia, Hotpack Corporation 10940 PA 19154 · Telex 685-1197 CIRCLE 95 ON READER SERVICE CARD

WORLD'S PUREST ACID

A c h e m i l u m i n e s c e n c e d e t e c t o r t h a t is selective for organosulfur a n d organoselenium c o m p o u n d s is developed for use with microbore H P L C systems. T h e design of t h e detector, detection principles, a n d p e r f o r m a n c e characteristics are discussed. E. A. Mishalanie and J . W. Birks*, Department of Chemistry and Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, Colo. 80309 Anal. Chem., 58 (1986) Theta Pinch Discharge Designed for Emission Spectrochemical Analysis: Design and Electrical Characterization

HYDROCHLORIC ACID HYDROFLUORIC ACID ACETIC ACID AMMONIA SOLUTION

TYPICAL SPECIFICATION: HCL = 36.48

923

T h e design a n d construction of a t h e t a pinch discharge for use as a h i g h - t e m p e r a t u r e p l a s m a source for emission spectrochemical analysis are described. Gregory J . Kamla and Alexander Scheeline*, School of Chemical Sciences, University of Illinois, 1209 West California Avenue, 79 RAL, Box 48, Urbana, 111. 61801 Anal. Chem., 58 (1986) Theta Pinch Discharge Designed for Emission Spectrochemical Analysis: Spectral Characterization 932 A t h e t a p i n c h discharge is s t u d i e d a s a h i g h - t e m p e r a t u r e p l a s m a source for t h e emission spectrochemical analysis of solid s a m p l e s . T h e effects of s a m p l e form a n d position within t h e discharge vessel as well as t h e effects of t y p e a n d p r e s s u r e of t h e discharge fill gas are discussed. Gregory J . Kamla and Alexander Scheeline*, School of Chemical Sciences, University of Illinois, 1209 West California Avenue, 79 RAL, Box 48, Urbana, 111. 61801 Anal. Chem., 58 (1986) Trace Element Determination Using Synchrotron Radiation

•Competitive Prices «Low Cost Refills NITRIC ACID SULPHURIC ACID HYDROBROMICACID PERCHLORIC ACID

Selective Detection of Organosulfur Compounds in HighPerformance Liquid Chromatography 918

940

Energy-dispersive X - r a y fluorescence analysis using m o n o c h r o m a t i c s y n c h r o t r o n r a d i a t i o n for excitation is s t u d i e d for d e t e r m i n a t i o n of t r a c e e l e m e n t s in biological m a t e r i a l s . Using o p t i m u m conditions, m i n i m u m d e t e c t a b l e limits of less t h a n 1 p p m are achieved. Robert D. Giauque*, J o s e p h M. Jaklevic, and Albert C. Thompson, Lawrence Berkeley Laboratory, University of California, Berkeley, Calif. 94720 Anal. Chem., 58 (1986) Evaluation of Reference Methods for Measurement of Carbon Monoxide Emissions at Refineries 945

ASSAY: > 35% MAXIMUM LIMITS OF IMPURITIES p p b

Al AS Β Ba Be Bi

5 10 0.6 0.04 0.1 20

ca 0.5

Cd 0.005 CO 0.8 Cr 0.05 Cu 0.03 Fe 5 Κ 0.5 Mg 1

eastar

Mn 0.1 MO 0.1 Na 15 Ni 0.04 Ρ 15 Pb 0.02 Sb 5

Si Sr Ti V Zn

5 0.04 0.4 0.5 0.4

SEASTAR CHEMICALS, P.O. BOX 2430,2045 MILLS ROAD SIDNEY, B.C., CANADA V8L3S1 (604) 656-0891 TELEX 049-7526

LOW PARTICULATE ACIDS AVAILABLE ON SPECIAL REQUEST

CIRCLE 191 ON READER SERVICE CARD 504 A · ANALYTICAL CHEMISTRY, VOL. 58, NO. 4, APRIL 1986

T h r e e colorimetric m e t h o d s for carbon m o n o x i d e d e t e r m i n a t i o n are e v a l u a t e d as p o t e n t i a l reference m e t h o d s for d e t e r m i n i n g t h e relative accuracy of nondispersive infrared carbon m o n o x i d e c o n t i n u o u s emissions m o n i t o r s . Eva D. Estes* and David L. Hardison, Center for Environmental Measurements, Research Triangle Institute, Research Triangle Park, N.C. 27709, and Guy B. Oldaker III, Entropy Environmentalists, Inc., Research Triangle Park, N.C. 27709, and F r a n k E. Butler, Joseph E. Knoll, and M. Rodney Midgett, Environmental Monitoring Systems Laboratory, United States Environmental Protection Agency, Research Triangle Park, N.C. 27711 Anal. Chem., 58 (1986)