A C BRIEFS Separation of Tellurium from Selenium and Other Fission Products by Precipitation with 1,10-Phenanthroline R. R. R/CKARD and E. I. WYATT, Oak Ridge National Laboratory, Post Office Box X, Oak Ridge, Tenn. 37831 Anal. Chem., 44, 877 (1972) Criterion for Judging the Acceptability of Analytical Methods KAREL ECKSCHLAGER, Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, Prague, Czechoslovakia Anal. Chem., 44, 878 (1972) Aromatic Hydroxylation as an Analytical Reaction KENNETH A. CONNORS and KENNETH S. ALBERT, School of Pharmacy, University of Wisconsin, Madison, Wis. 53706 Anal. Chem., 44, 879 (1972) Nuclear Magnetic Resonance Determination of fert-Butyl Hydroperoxide WILLIAM B. SMITH, Department of Chemistry, Christian University, Fort Worth, Texas 76129
Texas
Anal. Chem., 44, 881 (1972)
Aids for Analytical Chemists Simple Apparatus for Performing Reactions and Filtration Operations in the Absence of Air R. DONALD SPENCER, Carnegie-Mellon University, Institute, Pittsburgh, Pa. 15213
Mellon
Anal. Chem., 44, 882 (1972) Simple Device for Introduction of Mass Calibrant into a Gas Chromatograph-Mass Spectrometer System D. M. SCHOENGOLD and W. H. STEWART, Sun Oil Company, Marcus Hook, Pa. 19601 Anal. Chem., 44, 884
(1972)
Electrolytic Calibration Technique for Dissolved Nitrogen Determination in Seawater by On-Stream Stripping Gas Chromatography L. P. ATKINSON, Department of Oceanography, University, Halifax, Nova Scotia, Canada
Dalhousie
Anal. Chem., 44, 885 (1972) Rapid Technique for Dissolution of Nitrides DEAN H. BOLLMAN, U.S. Department of the Interior, Bureau of Mines, Albany Metallurgy Research Center, Albany, Ore. 97321 Anal. Chem., 44, 887 (1972) Simple Equation for Linearization of Data in Differential Scanning Calorimetric Purity Determinations DAVID L. SONDACK, Eli Lilly and Company, Indianapolis, Ind. 46206 Anal. Chem., 44, 888 (1972)
Nester/Faust High-Purity Separations: Distillation or Preparative Chromatography? IVe have the answer. Two Hundred Theoretical Plate Distillation System. The NFA-200, Adiabatic Teflon Spinning Band distillation column is the product of over fifteen years development and improvement in the science of spinning band fractionation. High purity separations of materials with boiling point differences as small as 0.2°C can be made with rapid throughputs at pressures as low as .005 mm Hg, with only .5 ml holdup. Automatic accessories such as auto reflux control, pot temperature control and head temperature deviation monitor allow unmatched ease of operation with minimal operator time expenditures. We have the answer. Automatic Preparative Chromatograph The Model 750 Preparative Gas Chromatograph allows automatic injection and collection of samples of from 0.2 to 20 ml. The high resolving power of the Biwall annular columns permits preparative size samples with analytical resolution, and the unique peak selection computer provides automatic unattended collection of any fraction or shoulder. Other outstanding features include absolutely repeatable temperature programming and injection, 450°C capability and high capacity oven (up to 75' of % inch column). Options available include Flame Ionization Detector, Electrostatic Precipitator, and all-glass system. For help with your separations problems and complete descriptions, specifications and applications of the NFA-200 and Prepkromatic 750 contact Nester/Faust Mfg. Corp. at Box 565, Newark, Delaware 19711, Phone: (302) 737-6330. CIRCLE 138 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 44, NO. 4, APRIL 1972 · 21 A NES1ER / FAUST
