QUALITY LABORATORY APPARATUS
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t y p e 2200
Hot pLAtes LARGE TOPS FOR BIG OR MULTIPLE HEATING JOBS
TYPE 2240 - 45M 24"χ 12" 3200 WATTS PRICE $190.00
TYPE 2230 - 35NI 12"x12" 1600 WATTS PRICE $124.00
Heavy cast aluminum top distributes heat evenly. Accom
Column Radioimmunoassay Method for the Determination of Digitoxin R. C. Boguslaski and C. L. Schwartz On the Determination of Ionization Constants in Proteins R. C. Marshall and G. I. H. Hanania Determination of 1 2 9 l at Natural Levels Using Neutron Activation and Isotopic Separation Harry L. Rook, James E. Suddueth, and Donald A. Becker New Easy Method for Obtaining Approximate Redox Potentials of Radicals, Produced by 6 0 Ο ο - γ Radiolysis, Using Heteropoly Electrolytes of Molybdenum and Tungsten as Electron Acceptors. The Redox Potential of Some Alcohol and Organic Acid Radicals Ellias Papaconstantinou Simultaneous Determination of Tellurium and Uranium by Neutron Activation Analysis Ernest S. Gladney and Harry L. Rook Determination of Arsenic and Antimony in Environmental Samples Using Gas Chromatography with a Microwave Emission Spectrometric System Yair Talmi and V, E. Norvell Preconcentration of Trace Metals Using Chelating Groups Immobilized via Silylation D. E. Leyden and G. H. Luttrell Theoretical Treatment of the Dynamic Response of Ion-Selective Membrane Electrodes E. E. Morf, E. Lindner and W. Simon
modates several vessels... each receiving the same uni form temperature. Demand-type thermostat connected directly to top plate, senses any change and supplies full power until set temperature is reached. It then cycles to hold temperatures within ±3°C of set point. Maximum operating temperature is 371°C. Cast aluminum top has integral ribs . . . won't warp or buckle. Reflective baffles., and thick insulation direct heat upward. Cooling air circulates around controls, extending control life and keeping bench tops cool. Perforated stainless steel case can support heavy loads. The rugged practicality of the Type 2200 Hot Plates make them highly desirable in any laboratory.
Write for new Laboratory Apparatus Catalog #500
THERMOLYNE SYBRON CORPORATION 2555 KERPER BOULEVARD, DUBUQUE, IOWA 52001
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ANALYTICAL CHEMISTRY, VOL. 47, NO. 8, JULY 1975
Chromatography of 49 Metal Ions on Stannic Antimonate Papers in Dimethylsulfoxide—Nitric Acid Systems and Aqueous Nitric Acid Systems Mohsin Qureshi, K. G. Varshney, and R. P. S. Rajput Determination of Amitriptyline at Nanogram Levels in Serum by Electron Capture Gas-Liquid Chromatography Jack E. Wallace, Horace E. Hamilton, Linda K. Goggin, and Kenneth Blum Monitoring of a Liquid Chromatograph with Subnanogram Sensitivity Using an On-Line Computer F. W. McLafferty, Ruedi Knutti, Rengachari Venkataraghavan, P. J. Arpino, and B. G. Dawkins Trace Element Analysis of Fluids by Proton-Induced X-Ray Fluorescence Spectrometry John L. Campbell, Brian H. Orr, A. W. Herman, Larry A. McNelles, W. B. Cook, and J. A. Thompson N e w and Improved Techniques for Applying the Mole Ratio Method to the Identification of Very W e a k Complexes in Solution C. D. Chriswell and A. A. Schilt
