NEW Total Flexibility in a Signal Averager
FUTURE ARTICLES Separation of High-Boiling Petroleum Distillates Using Gradient Elution through Dual-Packed (Silica Gel-Alumina Gel) Adsorption Columns D. E. Hirsch, R. L. Hopkins, H. J. Coleman, F. 0 . Cotton, and C. J. Thompson Gas Chromatographic Analysis of Complex Deuterated and Tritiated Mixtures with Packed Columns F. Bruner, P. Ciccioli, and A. D/ Corcia Pulsed NMR Measurement of Relaxation Times in Ion-Ex change Resins W. J. Blaedel, L. E. Brower, T. L. James, and J. H. Nogg/e Iodine in Acetic Acid—A Specific Analytical Reagent for the Cyclization of Aryl 2-Propynylcarboxamides J. A. Ra/h/e, L. J. Schommer, and D. C. W/mer An Automated Vacuum Fusion Apparatus J. W. Frazer, J. W. Fischer, C. J. Morris, R. W. Crawford, and E. Fisher Determination of Trace Amounts of Chromium(lll) Using Chemiluminescence Analysis W. R. Seitz, W. W. Suydam, and D. M. Hercules An Infrared Study of the Methylene Groups Absorptivities in Polar Straight Chain Aliphatic Compounds W. Zenker Ligand Exchange Chromatography of Amphetamine Drugs C. M. de Hernandez and H. F. Walton
Features As Standard Equipment • Built-in Oscilloscope · Digital Display • 10 uSec to 50 Sec Time Base ·
Data Proc
essing Including Differentiation · Pre & Post Analysis Delay · Continuous Display
Plug-in Units Available For: • 1,2 and 4 Input Signal Averaging • Waveform Digitizing • Pulse Height Analysis • Auto and Cross Correlation •
NMR&EPR
Quantitative Determination of Fluorenes in Cigarette Smoke and Their Formation by Pyrosynthesis D. Hoffmann and G. Rathkamp Quantitative Determination of Alkylbenzenesulfonate and Alkylsulfate Homologs, after Electrophoretic Separation Using Aqueous Dioxane Agarose Gels J. R. Bodenmiller and H. W. Latz Microdetermination of the Nitro and Nitroso Groups in Aromatic Compounds by Reduction with Iron(ll) in Acidic Alkaline Media W. /. Awad, S. S. M. Hassan, and M. T. M. Zaki An Apparatus for Supercritical Fluid Chromatography with C0 2 as the Mobile Phase R. E. Jentoft
and T. H. Gouw
Pulse Overlap Effects on Linearity and Signal-to-Noise Ratio in Photon Counting System J. D. Ingle, Jr., and S. R. Crouch
• Computer Interface • Additional Plug-in Units Available
1024 channels $7,450 2048 channels $8,950 · 4096 channels $10,450
NORTHERN SCIENTIFIC, INC. P.O. Box 66/Middleton, Wis. 53562 · 608/836-6511 ΤWX · 910 · 280 · 2521 A SUBSID.ARV OF Tuscan
Acid Interferences in Atomic Absorption Spectrometry W. B. Barnett Indirect Spectrophotometric Determination of Oxalate Us ing Uranium and 4-(2-Pyridylazo) Resorcinol R. E. Neas and J. C. Guyon
Automated Colorimetric Determination of Penicillin in Fermentation Samples Using a Molybdoarsenic AcidMercuric Chloride Reagent K. A. Hoim Double Modulation-Optical Scanning and Mechanical Chopping in Atomic Absorption Spectrometry Using a Continum Source R. C. Elser a n d J. D.
CIRCLE 137 ON READER SERVICE CARD 118 A ·
ANALYTICAL CHEMISTRY, VOL. 4 4 , NO. 3 , MARCH
1972
Winefordner
