AC BRIEFS
What's a good VACUUM connection?
Separation and Determination of Isocyanurates by Gas Chromatography Isocyanurates with molecular weights as high as 400 have been analyzed in a study of three systems which represent the major products obtained from the base catalyzed cotrimerization of the appropriate isocyanurates. GARY W . RUTH and RUDER SCHILL, Marathon O i l Co., Denver Research Center, P. O. Box 269, Littleton, Colo. 80120 Anal. Chem. 40, 1582 (1968) G a s C h r o m a t o g r a p h i c Determination of B e n z o ( a ) P y r e n e in C i g a r e t t e Smoke Considering that it w a s designed t o satisfy a number of special a p p l i cations, Hoke's Gyrolok fitting is surprisingly at home in vacuum service.
The GC method reported is basically an ionization detector with a helium glow discharge as the electron source, capable of operating at temperatures as high as 400 ° C . As little as 1 ng of B a P can bo measured with precision. HOWARD J . DAVIS, Celanese Research Co., Box 1000, Summit, N.J. 07901 Anal. Chem. 40, 1583 (1968)
It w i l l , for instance pass a mass spectrometer leak test handily. So, if y o u w o r r y about high v a c u u m systems, the new Gyrolok catalog with all its sizes, shapes & materials is a pretty g o o d tranquilizer. Your Hoke distributor has one for y o u .
S e p a r a t i o n of l r o n ( l i ) - l r o n ( I I I ) M i x t u r e s b y Simultaneous P a p e r C h r o m a t o g r a p h y and Electrophoresis Descending chromatography with simultaneous low voltage paper electrophoresis is used to obtain separations of mixtures of F e ( I I ) and F e ( I I I ) in 0.005.2V sulfuric acid.
GYROLOK
W . E. LINGREN, G. R. REECK and R. J . MARSON, Department of Chemistry, Seattle Pacific College, Seattle, Wash. 98119 Anal. Chem. 40, 1585 (1968) HOKE MFG. CO · 1 TENAKILL PARK · CRESSKILL, N.J.
Correspondence
See ACS Laboratory Guide for All Products/Sales Office Circle No. 7 on Readers' Service Card
Gas-Liquid C h r o m a t o g r a p h i c Separation of Thyroid Hormones LYDELL B. HANSEN, Dallas District, Food and Drug A d ministration, 3032 Bryan St., Dallas, Texas 75204 Anal. Chem. 40, 1587 (1968)
ANALYTICAL STANDARDS
Aids for Analytical Chemists
• Pesticides • Amines • Aldehydes • Amino Acids • Spectrographs Grade Reagents • Special Custom Synthesis
An Integrated Gas Chromatograph-Mass S p e c t r o m e t e r System w i t h C a r r i e r Gas Separator MAX BLUMER, Woods Hole Océanographie Institution, Woods Hole, Mass. 02543 Anal. Chem. 40, 1590 (1968) I n d u c t i o n H e a t i n g in Z o n e M e l t i n g o f O r g a n i c Compounds HENRY PLANCHER, J . C. MORRIS, and W . E. HAINES. Laramie Petroleum Research Center, Bureau of Mines, U. S. Department of Interior, Laramie, W y o .
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Anal. Chem. 40, 1592 (1968) L i n e a r i z a t i o n of E l e c t r o n C a p t u r e Response b y A n a l o g C o n v e r s i o n
Detector
D. C. FENIMORE, Texas Research Institute of Mental Sciences, Houston, Texas 77025, and ALBERT ZLATKIS and W . E. WENTWORTH, Department of Chemistry, University of Houston, Houston, Texas 77004 Anal. Chem. 40, 1594 (1968) T r a p p i n g Technique f o r Open Tubular C h r o m a t o g r a p h i c Columns DONALD E. WILLIS, Monsanto, Co., Hydrocarbon and Polymers Div., Research Dept., St. Louis, Mo. 63166 Anal. Chem. 40, 1597 (1968)
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