Manufacturers' Literature purity. Techniques used include emission spectrometry, x-ray diffractometry, and x-ray fluorescence spectrometry. United States Testing Co., Inc. 452 Nitrogen Detection. Application Notes features articles on the application of the Model 703 nitrogen detection system for the determination of morpholine preservative and for determining chemically bound nitrogen. 4 pp. Antek Instruments, Inc. 454 Infrared Spectrophotometers. Features a wide range of IR supplies including liquid sampling cells, dies, KBr powder and hydraulic press for solid sampling, microsampling pelleting kits, gas sampling cells, and specular reflectance and multiple reflection accessories. 8 pp. Beckman Instruments, Inc. 455 Instrumentation Tape Recorder. Describes the Model SE7000M, which combines the capacity and performance of laboratory installation with the versatility and operational simplicity of a fully portable general-purpose field recorder. 6 pp. EMI Technology Inc. 456
GCA CORPORATION
Liquid Chromatography. A methods development guide is designed to aid the chromatographer in the selection of a suitable column and mobile phases for his purposes in the various modes of liquid chromatography: adsorption, partition, and ion exchange. Two other reports present column performance criteria and information on the Zorbax CN polar bonded phase packings. Du Pont Instruments 453
Chromatography Columns. Describes new line of precision-designed columns made of high-quality borosilicate glass. Columns feature low dead space to minimize mixing of separated zones, allowing high resolution by ascending or descending flow. 5 pp. Amicon Corp. 458
Catalogs Tools for Synthesis. Lists compounds used in general laboratory and industrial synthesis, in polymer synthesis, and in the synthesis of organometallics. Also includes reagents for the determination of functional groups and lists of organometallics and complex salts. 22 pp. Publication No. JJ-195 available from Eastman Kodak Co., Department 412-L, Rochester, N.Y. 14650 For more information on listed items, circle the appropriate numbers on one of our Readers' Service Cards
Materials for Evaporation and Sputtering. Includes full line of sputtering and evaporation equipment and over 300 metals, alloys, and nonmetallic materials up to 9 9 . 9 9 + % purities. Materials Research Corp. 461 Stainless Steel Lab Products. Lists a wide variety of items including portable pressure vessels, carboys, vacuum line fittings, Dewar flasks, reaction flasks, tanks, storage containers, and miscellaneous small utensils. 24 pp. Pope Scientific, Inc. 460 Optics and Optical Filters. Features an expanded line of surplus items priced at 1 0 - 4 0 % of list as well as the complete line of standard stock optical filters. 28 pp. Corion Corp. 463
105nm TO 60jjm AND NEW HOLOGRAPHIC GRATINGS Start with wavelength versatility. Add symmetrical profiles and plenty of workspace. Then add the new option of holographic gratings. [ The0.3meterMcPherson218 is destined to remain the most popular vacuum monochromator in the field.
Add the new McPherson 786 controller, and you scan digitally at 13 speeds from .05 to 500 nm/minute with TTL compatibility. The 786 retrofits any 218 and many other McPherson instruments. Call (61 7) 263-7733, at our Acton, Mass., technical center for more information. Or write McPherson Instruments, GCA/Precision Scientific Group, 3737 West Cortland Street, Chicago, III. 60647
McPHERSONT DOES IT WITH PRECISION
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370 A · ANALYTICAL CHEMISTRY, VOL. 50, NO. 3, MARCH 1978
Manufacturers' Literature Chemicals. Chemalog 77/78 lists over 8000 biochemicals and organics includ ing amino acids, t-BOC amino acids, peptides, peptide reagents, buffers, clinical chemicals, enzyme substrates, ion-exchange resins, molecular sieves, and nucleic acids and derivatives. Chemical Dynamics Corp. 459 Pressure Chemicals. Features com plete listings and prices of polystyrene sulfonate standards, metal carbonyls and their derivatives, liquid crystals and cholesteric esters, polymer standards, organophosphorus and organoarsenic compounds, and specialty chemicals. Catalog will be continually updated. To order send $1.00 each to Pressure Chemical Co., 3419 Smallman St., Pittsburgh, Pa. 15201 Chart and Graph Papers. Features comprehensive listing of chart and graph papers includingsquare-grid sheets, time-cycle sheets, data sheets, semi- and full-logarithmic sheets, rec tangular-grid sheets, metric sheets, and other miscellaneous sheets. 36 pp. Codex Book Co. 462
Spectrophotometric Solvents. Provides complete specifications for 38 spectro photometric solvents. Also includes toxicity data, spill and disposal proce dures, proper handling and storage con ditions, effects of overexposure, and first-aid procedures. 52 pp. Eastman Kodak Co., Department 412-L, Roches ter, N.Y. 14650 Thin-Layer Chromatography. Contains full line of products including equipment for TLC, paper chromatography, frac tion collection, rotary flash evaporation, and viscosity determinations. Scientific Manufacturing Industries 467 Reagents for Acrylamide Gel Electro phoresis. Includes information on gelforming reagents, catalysts and initia tors, buffers, dyes and stains, and mis cellaneous reagents. Price list included. 12 pp. Eastman Kodak Co., Department 412-L, Rochester, N.Y. 14650 Plastic Laboratory Products. Features complete line of Lancer precisionmolded polystyrene, polypropylene, and polyethylene products. 12 pp. P. J. Cobert Associates 468
Optical Mounts. Includes over 1000 products including mounts, stages, laser application equipment, optics, vi bration-stable platforms, and nonde structive testing systems. Introductory discussions provide the basics of lasers and holography. 100 pp. Newport Re search Corp. 464 pH Meters. Includes over 125 elec trodes, pH meters with normal and ex panded scale as well as digital readout, oxygen meters, conductivity meters, colorimeters, and tutorial data on pH and specific-ion electrodes. 24 pp. Chemtrix, Inc. 465 Safety Supplies. Features complete line of safety supplies to assist in meet ing OSHA regulations. Includes new re usable dust respirators and toxic gas monitoring equipment. 72 pp. Interex Corp. 471 Liquid Scintillation Chemicals and So lutions. Features the complete line of high-efficiency liquid scintillation cock tails for aqueous and nonaqueous counting. 10 pp. National Diagnostics 472
QOInm RESOLUTION A N D A NEW PROGRAMMER 0.01 is for a regular 1200 G / m m grating. Results are equally impressive with other snap-in gratings, including holographic types. Model 2051 makes your work free of error from astigmatism, coma and spherical aberration, 185 nm to 78 μπι.
Add the modestly McPherson Instruments, GCA/Precision Scientific Group, priced new 3737 West Cortland Street, McPherson 786 Chicago, III. 60647 controller, and you scan digitally GCA at 13 speeds from .05 to 500 nm/ CORPORATION minute with TTL compatibility. Call (617) 263-7733, at our Acton, Mass., technical center for more information. Or write DOES IT WITH PRECISION
McPHERSONTM
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ANALYTICAL CHEMISTRY, VOL. 50, NO. 3, MARCH 1978 · 371 A
