Geochemistry - American Chemical Society

Application note ... Service Cards. Large-sample scanning probemicroscope accommodates samples upto 200 ... D.C. 872-4363) and use your credit card!...
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Food analysis. Application note A-10.4 discusses the quantitative determination of vitamin C in fruit juice by instrumental TLC. Camag 418 Surface analysis. Brochure highlights the NanoScope atomic force microscope. Information on data analysis and display capabilities is provided. 12 pp. Digital Instruments 419 pH meters. Bulletin highlights Accumet pH/ion meters. A selection guide provides information on range, accuracy, repeatability, slope control, and special features. 16 pp. Fisher Scientific 420 Newsletter. Fei focus features articles on source-column interactions in the production of submicron electron beams and on imaging time-offlight SIMS. 8 pp. FEI Co. 421 Separations. The Separation Times, Vol. 5, No. 1, includes articles on the determination of residual solvents in pharmaceutical manufacture and on the conditioning of solid-phase extraction cartridges. 12 pp. J & W Scientific 422 LC. Brochure describes Superformance columns for biochromatography, which feature high operating pressures, zero dead volume, and a glass cartridge system. EM Separations 423

Catalogs HPLC. Catalog includes columns for analytical, preparative, and biochemical applications; affinity adsorbents; column heaters; pumps; detectors; and autosamplers. 368 pp. Rainin Instrument Co. 424 Chromatography. Catalog features vials, caps, seals, and crimping systems for chromatography autosamplers. An instrument and vial compatibility chart is included. 36 pp. Chromacol 425 Instrumentation. Catalog includes nitrogen and sulfur analyzers; process and on-line instrumentation; gas chromatographs, detectors, and accessories; and products for sample and data handling. 28 pp. Antek Instruments 426 Environmental analysis. Catalog features products for laboratory analysis of hazardous waste by EPÀ methods. Rotary extractors, filtration units, and syringes are included. 20 pp. Associated Design and Manufacturing Co. 427 For more information on instrumentation and software products, and/or to obtain the free available information on other listed items, please circle the appropriate numbers on one of our Readers' Service Cards.

Geochemistry of Sulfur in Fossil Fuels

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ulfur in fossil fuels-how it got there and what form it's i n - i s the subject of this unique, new volume. It is the first to fo­ cus entirely on chemical processes occuring in geological environments. Thirty-two chapters cover the current state of knowledge and address major advances that have established a new era of under­ standing at the molecular level in sulfur geo­ chemistry. Various fuel systems are examined, as well as the reasons for their differences and similarities. Major advances made during the last decade by improved analytical meth­ ods are emphasized. The volume begins with an introductory sec­ tion that presents historical background, ad­ dresses environmental consequences of the combustion of fossil fuels, describes microbial metabolism of sulfur compounds, and reviews methods for isolating sulfur compounds. Other sections cover: • studies of depositional environments • characterization of sulfur in fossil fuel materials • molecular structure of sulfur compounds and their geochemical significance • isotopic studies A 50-page bibliography compiling references from the individual papers is also included. Wilson L. Orr, Editor. Mobil Research and De­ velopment Corporation Curt M. White. Editor. Pittsburgh Energy Technology Center Developed from a symposium sponsored by the Divi­ sion of Geochemistry of the American Chemical Society ACS Symposium Series No. 4 2 9 708 pages (1990) Clothbound ISBN 0-8412-1804-8 LC 90-839 $109.95 Ο · R · D · Ε · R

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American Chemical Society DistributionOffice,Dept. 76 1155 Sixteenth St., N.W. Washington, DC 20036 or CALL TOLL FREE

Large-sample scanning probe microscope accommodates samples up to 200 mm in diameter. The x-y stage positioning can be controlled manually or automatically and is accurate to within ± 10 μΓτι. Digital Instruments 428

800-227-5558 (in Washington. D.C. 872-4363) and use your credit card!

ANALYTICAL CHEMISTRY, VOL. 63, NO. 14, JULY 15, 1991 · 739 A