Variscan:.. that lets you see Variscan permits you to detect and analyze compounds thai
Variscan detector, front center, can be used with liquid chromatograph models 4000, 4100 and 4200 (shown here).
C o m p a r e d to Variscan, other LC detectors are almost blind. T h e y operate at only one or a few wavelengths.
Variscan can b e used with gradient elution and is compatible with a wide range of chromatographically useful solvents.
Variscan operates over the entire UV-Vis spectral region, from 210 to 780 nm, with no sacrifice in efficiency. At the turn of a dial you can set Variscan at the maximum absorption wavelength of virtually any compound.
Minimum detectable quantities are nanogram amounts. Cell volume is small, only 8 microliters, so that peak spreading is minimized; and the cell p a t h is long, 1 centimeter, so that response to low concentrations is increased. T h e Variscan L C detector is basically a unique Varian UV-Vis spectrophotometer. T h e spectrophotometer flow cells are a m a t c h e d pair.
And whenever you wish, you can quickly stop flow, push a button and obtain absorption spectra of individual peaks in your chromatogram. Spinning Dropping Mercury Electrode. H. J. Martko, R. E. Cover, St. John's University, Jamaica, N.Y. 11439 Anodic Oxidation of Aromatic Aldehydes Studied by dc and Pulse Polarography. W. J. Bover, P. Zuman, Clarkson College of Technology, Potsdam, N.Y. 13676 Current-Reversal Chronopotentiometric Studies of Radical Anion Decay Rates: Tertiary Alkyl Nitro Compounds. R. H. Gibson, J. C. Crosthwaite, University of North Carolina, Charlotte, N.C. 28213 Analysis of Lead and Cadmium in Foodstuffs by Anodic Stripping Voltammetry. E. Zink, W. R. Matson, R. Griffin, Environmental Sciences Associates, Burlington, Mass. 01803
General Spectroscopy Chairman: J. Hwang, Instrumentation Laboratories, Lexington, Mass.
Submitted papers: Hydrated Proton H+(H 2 0)n. II. A Spectroscopic Study and Normal Coordinate Treatment of the Oxonium Ion H 3 0 + and D 3 0 + . L. J. Basile, P. LaBonville, J. R. Ferraro, J. M. Williams, Argonne National Laboratory, Argonne, 111. 60439 Molecular Emission Cavity Analysis (MECA)—Some Applications in Trace Analysis. R. Belcher, S. Bogdanski, S. A. Ghonaim, A. Townshend
Use of Polarized IR Reflectance and Differential Analysis in Resolving Overlapping Bands in Spectra of Apatites. E. Klein, J. P. LeGeros, R. Z. LeGeros, New York University Dental Center, 339 East 25th Street, New York, N.Y. 10010 Mode-Locked Laser Raman Spectroscopy—A New Technique for Rejection of Interfering Luminescence Signals. R. P. VanDuyne, D. Jeanmaire, D. F. Shriver, Northwestern University, Evanston, 111. 60201 Selective Modulation: A New TechniqueinLuminescence Spectrometry. T. C. O'Haver, G. L. Green, University of Maryland, College Park, Md. 20742 Some Applications of First and Second-Derivative Techniques in Luminescence Spectrometry. T. C. O'Haver, G. L. Green, University of Maryland, College Park, Md. 20742 New Phosphors for Determination of Rare Earths in Cr, Mn, Fe, Co, Ni, and Cu Compounds or Metals. E. L. DeKalb, V. A. Fassel, Ames Laboratory-USAEC, Iowa State University, Ames, Iowa 50010 Spectrochemical Analysis of Trace Metals in Aqueous Media Using Shock Tube as Controlled-Temperature Excitation Source. R. D. Sacks, V. J. Cordasco, University of Michigan, Ann Arbor, Mich. 48104 Spectroscopic Study of Amine Coordination to the Complexes of Cop-
994 A · ANALYTICAL CHEMISTRY, VOL. 45, NO. 12, OCTOBER
1973
per, Nickel, and Cobalt with EDTA and NT A. Irwin M. Citron, Fairleigh Dickinson University, Rutherford, N.J. 07070
Chromatography Chairman: A. Schroff, Ortho Pharmaceutical Corp., Raritan, N.J. 08869
Submitted papers: Sphingolipids, a New Precursor. J. Kilingman, SUNYAB, Buffalo, N.Y. Judicious Application of BSA in Antibiotic Analysis. M. Margosis, FDA, 200 C Street, Washington, D.C. 20040 Determination of Steroid Sulfates by Gas Chromatography After Transesterification with Heptafluorobutyric Anhydride. J. C. Touchstone, M. F. Dobbins, School of Medicine, University of Pennsylvania, Philadelphia, Pa. 19104 Analysis of Toxicants Using Microwave Induced Emission. D. J. Lisk, Cornell University, Ithaca, N.Y. Rapid Test System Which Measures Effects of Anti-inflammatory Drugs on Prostagalandin Biosynthesis. J. W. Horodniak, J. E. Zarembo, E. White, A. D. Bender, Smith Kline & French Laboratories, Philadelphia, Pa. 19101 Derivatization Techniques in Gas Chromatography-Mass Spectrometry; A Comparison of Trimethylsily-
the LC detector one hell of a lot more absorb at any UV-Vis wavelength from 210 nm to 780 nm.
VIS Water-jacketed, they maintain stable t e m p e r a t u r e equilibrium b e t w e e n the cell a n d the solvent, even with flow programming. T h e carefully m a t c h e d optical paths of the spectrophotometer also minimize noise a n d drift. Overall system noise is ^±5 χ 10~4 absorbance unit from 210 to 780 nm; drift is lower t h a n 10 - 2 absorbance unit/hour—performance specifications which ensure that you will see m o r e w i t h Variscan than with any other L C detector.
N o w it is possible to detect and analyze a m u c h b r o a d e r range of compounds. P a r d o n our French, b u t you really can see one hell of a lot more with Variscan.
For complete details see your Varian representative or write: Varian I n s t r u m e n t Division, 611 Hansen Way, Box D-070, Palo Alto, California 94303.
varian instruments B r a n d n a m e s : ANASPECT™ · CARY® · M A T · VARIAN® V A R I A N AEROGRAPH® · V A R I A N T E C H T R O N
L C is no longer detector-limited. CIRCLE 230 ON READER SERVICE CARD
lation a n d Methylation. R. W. Walk er, W. J. A. Vanden Heuvel, Merck Sharp & Dohme Research Laborato ries, Rahway, N.J. 07065 Separation of P o l y u n s a t u r a t e d F a t t y Acids by High-Speed Re verse-Phase Liquid Chromatogra phy. S. Ramachandran, P. Pei, R. S. Henly, Applied Science Laboratories, Inc., State College, Pa. 16801 Dual-Load Open Tubular Columns. J. G. Nikelly, Philadelphia College of Pharmacy and Science, Philadelphia, Pa. 19104 Simple and Effective Methods of Improving Thin-Layer Chromato graphic Separations of Closely Re lated Compounds. P. Taylor, H. R. Roberts, Squibb Institute for Medical Research, New Brunswick, N.J. 08903
Exhibitors Exhibit Hours: Wednesday and Thursday, November 14 and 15, 9:00 a.m. to 6:00 p.m.; Friday, No vember 16, 9:00 a . m . to 1:30 p.m. Exhibit Manager: Norman Gardner, 73 Ethel St., Metuchen, N.J. 08840 Addresses of the companies may be found in ANALYTICAL CHEM ISTRY'S 1973-74 Lab Guide in the Company Directory Ace Scientific Supply Analabs, Inc.
Analtech, Inc. Applied Science Labs., Inc. Autolab Div. Spectra-Physics Baird-Atomic, Inc. B/R Glass, Inc. Barnes Engineering Co. B e c k m a n Instruments, Inc. Bendix Corp. Brinkmann Instruments, Inc. Bruker Scientific, Inc. Buck Scientific Co. Camag, Inc. Carle Instruments, Inc. Chemical Data Systems, Inc. Chromatec, Inc. Chromatography Associates, Inc. Columbia Scientific Industries Conference Book Service, Inc. Continental Water Conditioning Coulter Electronics Curtin Scientific Co. Digilab, Inc. Du Pont Co. Ε Μ Laboratories, Inc. Encyclopaedia Britannica Environmental Sciences Assoc. Esterline Angus Instruments F & J Scientific Farrand Optical Co. Fisher Scientific Co. Gilford Instrument Labs. Glenco Scientific, Inc. G o w - M a c Instrument Co. Hamilton Co., Inc. Harrick Scientific Corp. Harvey Instruments Corp. Heat Systems-Ultrasonics
Hewlett-Packard Corp. Honeywell, Inc. Instrumentation Laboratory, Inc. Instrumentation Specialties Co. Int'l Scientific Communications Jarrell-Ash Div. Fisher Scientific Kraft Apparatus, Inc. Labindustries, Inc. Linear Instruments Corp. London Co. Monroe—The Calculator Co. Norcon Instruments, Inc. Orion Research, Inc. Ortec, Inc. Perkin-Elmer Corp. Pharmacia Fine Chemicals, Inc. Philips Electronic Instruments Rainin Instruments H. Reeve Angel & Co. Rigaku/USA Sadtler Research Labs., Inc. Sartorius Div. Brinkmann Instr. Schoeffel Instruments Corp. Scientific Gas Products, Inc. SGA-Scientific Siemens Corp. Spectral Imaging, Inc. Spectra-Metrics, Inc. Spex Industries, Inc. Supelco, Inc. Technicon Arthur H. Thomas Co. Tracor, Inc. Varian Associates Waters Associates, Inc. Wilks Scientific Corp. Wilmad Glass Co., Inc.
ANALYTICAL CHEMISTRY, VOL. 45, NO. 12, OCTOBER 1973 · 995 A
