Briefs
Unattended H PLC Up to 192 injections Up to 64 samples Automatically . . . • Microprocessor operation controls injections per sample, injection time, rinse b e t w I H samples and automatic shutdown. • Positive flow design r e q u i i B only 0.75 ml of sample, allows precise, reproducible sample volumes. • Adaptable to any HPLCrli pumping unit — can be externally controlled by computer integrator.
. . . with the model 7 2 ^ automatic injector f o r HPLC
Determination of Trace Quantities of Aromatic Amines in Dyestuffs 171 Benzidine, a- a n d β - n a p h t h y l a m i n e , 3,3'-dichlorobenzidine, a n d 4 - d i m e t h y l a m i n o a z o b e n z e n e a r e analyzed by extraction with chloroform followed by gas-liquid c h r o m a t o g r a p h y a n d thin-layer c h r o m a t o g r a p h y . J a n o s Schulze,* Charles Ganz, and Douglas P a r k e s , Dyestuffs and Chemicals Division, CIBA-GEIGY Corporation, Post Office Box 11422, Greensboro, N.C. 27409 Anal. Chem., 50 (1978) Determination of the Aqueous Solubility of Polynuclear Aromatic Hydrocarbons by a Coupled Column Liquid Chromatographic Technique 175 A novel t e c h n i q u e based on p u m p i n g distilled water t h r o u g h t h e r m o s t a t e d " g e n e r a t o r c o l u m n s " provides a m e a n s for d e t e r m i n i n g t h e a q u e o u s solubility of polynu clear a r o m a t i c h y d r o c a r b o n s as a function of t e m p e r a t u r e . Willie E. May* and Stanley P. Wasik, Institute for Materials Re search, National Bureau of Standards, Washington, D.C. 20234, and David H. Freeman, Chemistry Department, University of Maryland, College Park, Md. 20790 Anal. Chem., 50 (1978) Nondestructive High Temperature Gas Radiochromatography
179
A n o n d e s t r u c t i v e gas r a d i o c h r o m a t o g r a p h i c system for continuous o p e r a t i o n a t 300 ° C is developed. B a c k g r o u n d s are low (75 c p m ) a n d detector d e c o n t a m i n a t i o n can be d o n e in situ. B. E. Gordon,* W. R. Erwin, M. Press, a n d R. M. Lemmon, Laboratory of Chemical Biodynamics, Lawrence Berkeley Labora tory, University of California, Berkeley, Calif. 94720 Anal. Chem., 50 (1978)
Aids for Analytical Chemists Isolation of Xenobiotic Chemicals from Tissue Samples by Gel Permeation Chromatography
182
Douglas W. Kuehl* and Edward N. Leonard, U.S. Environmen tal Protection Agency, Environmental Research Laboratory-Duluth, 6201 Condgon Boulevard, Duluth, Minn. 55804 Anal. Chem., 50 (1978) High Performance Liquid Chromatographic Determination of Unreacted Acrylamide in Emulsion or Aqueous Homopolymers or Emulsion Copolymers 185 F. J . Ludwig, Sr.,* and M. F. Besand, Research Laboratory, Petrolite Corporation, Tretolite Division, St. Louis, Mo. 63119 Anal. Chem., 50 (1978) Supplementary Information for "Reagent Chemicals", 5th Edition 188
micromeritics® instrument corporation 5 6 8 0 goshen s p r i n g s W B | Τ^^ΉΤ^^ U.S.A. · telephone: 4 0 4 / 4 4 ï P H £ ^ R ! T e x : 70-7450 CIRCLE 142 ON READER SERVICE CARD 10 A · ANALYTICAL CHEMISTRY, VOL. 50, NO. 1, JANUARY 1978
Manuscript Requirements
189
Spectrometry Nomenclature
190
Guide for Use of Terms in Reporting Data in ANALYTICAL CHEMISTRY 191 Analysis, Identification, Determination, and Assay
191
SI Units
192
