BRIEFS Tetrakis(dimethylamino)ethylene: Identification of Impurities and Compatibility with Common Metal, Polymer, and Ceramic Laboratory Materials 2095 Six major impurities in TMAE account for more than 99.5% of all impurities detected. Less than 1% TMAE decomposi tion occurs in the presence of common metal, polymer, and ceramic laboratory materials. Robert T. Rewick* and Mary L. Schumacher, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, and Stephen L. Shapiro and Thomas B. Weber, Stanford Linear Accelerator Cen ter, P.O. Box 4349, Stanford University, Stanford, CA 94305, and Matteo Cavalli-Sforza, Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 94064 Anal. Chem., 60 (1988)
Multielement Analysis by High-Performance Liquid Chromatography following Solvent Extraction with Acetylacetone
2099
The HPLC behavior of metal acetylacetonates is investigat ed using nine normal- and reversed-phase columns. The linear calibration curves for Cu, Fe, and Pd are obtained, and parts-per-million to low parts-per-billion levels of Cu and Fe in tap water are determined. Susumu Ichinoki*, Noriko Hongo, and Mitsuru Yamazaki, School of Pharmacy, Hokuriku University, 3 Ho Kanagawa-Machi, Kanazawa 920-11, Japan Anal. Chem., 60 (1988)
Now quadrupole gas analysis, x s r
mance * Λ ΜΑΙ rack-mount and bench I ( J I J I J i models, Ametek can also offer *^ you a mobile Dycor™ Quadrupole Gas Analyzer. A perfect, go-anywhere, microprocessor-based mass spectrometer that can handle all your gas analysis, process monitoring, or leak detection applications. And tell you in a glance at the high resolution display—exactly what's in your sample, off-gas, or vacuum system. Standard Features D 1-100 AMU Mass Range Π Faraday Cup Detector D 100% Front Panel Control D HighResolution CRT Display D Graph or Tabular Data Display Π RS232 Computer Interface D 5 χ 10",? Torr Minimum Detectable Partial Pressure Π Background Subtraction
Optional Features D 1-200 AMU Mass Range D Pressure vs Time Display D Graphics Printer For Hard Copy D Electron Multiplier D 5 χ 10"14 Torr Minimum Detectable Partial Pressure D Sample System For Higher Pressures For literature, contact AMETEK, Thermox Instruments Division, 150 Freeport Road, Pittsburgh, PA 15238. Tel: (412) 828-9040.
Retention and Selectivity Surfaces of Deoxyribonucleotides in Reversed-Phase Chromatography 2104 Selectivity surfaces obtained in 5-deoxyribonucleotide sepa rations indicate several approaches for the optimization of these separations. Temperature, pH, and methanol content influence selectivity uniquely, but little interdependence of these factors is found. Eli Grushka and Phyllis R. Brown*, Department of Inorganic and Analytical Chemistry, The Hebrew University, Jerusalem, Isra el, and Nan-In Jang, Department of Chemistry, The University of Rhode Island, Kingston, RI 02881 Anal. Chem., 60 (1988)
Flame Infrared Emission Detector for Gas Chromatography 2110 The detector utilizes the carbon dioxide 4.3-jum (2326 cm" 1 ) emission band resulting from the combustion of organic compounds in a hydrogen-air flame. For injections of pentane, the detector is at least 1 order of magnitude more sensitive than the thermal conductivity detector. M. Keith Hudson and Kenneth W. Busch*, Department of Chem istry, Baylor University, Waco, TX 76798 Anal. Chem., 60 (1988)
Micelle Exclusion Chromatography of Heavy-Metal Cations 2116 Micelle exclusion chromatography is applied to the separa tion of several transition and rare earth metal ions. The separation mechanism is discussed. Tetsuo Okada, Faculty of Liberal Arts, Shizuoka University, 836 Ohya, Shizuoka 422, Japan Anal. Chem., 60 (1988)
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1076 A · ANALYTICAL CHEMISTRY, VOL. 60, NO. 19, OCTOBER 1, 1988
