Briefs
STABLE GAS MIXTURES IN ALUMINUM CYLINDERS Thorium-229 as an Isotopic Tracer for the Radiochemical Determination of Thorium Isotopes in Biological Samples 1712 McDonald E. Wrenn, Narayani P. Singh,* Shawki A. Ibrahim, and Norman Cohen, Institute of Environmental Medicine, New York University Medical Center, 550 First Avenue, New York, N.Y. 10016 Anal. Chem., 50 (1978)
Off-Axis Imaging for Improved Resolution and Spectral Intensities 1714 S. G. Salmon and J. A. Holcombe,* Department of Chemistry, The University of Texas at Austin, Austin, Tex. 78712 Anal. Chem., 50 (1978)
Determination of Phosphorus-Containing Compounds by Spectrophotometry 1716 Alasdair M. Cook,* Christian G. Daughton, and Martin Alex ander, Laboratory of Soil Microbiology, Department of Agrono my, Cornell University, Ithaca, N.Y. 14853 Anal. Chem., 50 (1978)
Deuterium Lock-Channel Nuclear Magnetic Resonance Thermometers for Multlnuclear Spectrom eters 1717 Gerald A. Pearson* and David E. Vietti, Chemistry Depart ment, University of Iowa, Iowa City, Iowa 52242 Anal. Chem., 50 (1978)
Microsampling Nebulizer Technique for Premlxed Flame Atomic Spectrometry 1719 R. C. Fry, S. J. Northway, and M. B. Denton,* Department of Chemistry and University Analytical Center, University of Arizo na, Tucson, Ariz. 85721 Anal. Chem., 50 (1978)
Flow-Through Electrochemical Cell with Open Liquid Junction 1722 W. J. Blaedel* and Z. Yim, Department of Chemistry, University of Wisconsin-Madison, Madison, Wis. 53706 Anal. Chem, 50 (1978)
Accuracy of the Hydrogen Ion Selective Glass Electrode 1724
Standard steel cylinders are satisfactory for most calibra tion gas mixtures containing components having a con centration of 0.5 percent or greater, irrespective of the chemical nature of the gas. But for calibration gas mix tures containing reactive components in the low and fractional parts per million range, MATHESON PRO CESSED ALUMINUM CYLINDERS are the recom mended containers. Matheson pioneered in the prepara tion and analysis of gas mixtures. Matheson has devel oped the standard aluminum cylinder into a container that assures the long term stability of reactive gas com ponents in calibration gas mixtures. Calibration gas mixtures containing reactive components such as H2S, SO2, NO2, NO, CO, COS, and CH3SH are available in MATHESON PROCESSED ALUMINUM CYLINDERS. For a free brochure that describes the mixtures, con centrations and specifications available in MATHESON PROCESSED ALUMINUM CYLINDERS, request Tech/ Brief No. TB 157 from Matheson, 1275 Valley Brook Ave., P.O. Box E, Lyndhurst, Ν J 07071. CIRCLE 138 O N READER SERVICE CARD
DON'T RUN OUT OF GAS Matheson's new cylinder scale provides positive indica tion of the remaining liquefied gas content in a cylinder. Mass is the only reliable method for determining the contents of a liquefied gas cylinder. As long as there is liquid in a cylinder the pressure at the cylinder outlet remains constant so pressure is no indication of cylinder content. Use the Matheson cylinder scale in the lab, plant, or field. Keep a single cylinder on the scale platform for continuous monitoring of the depletion of the content, or carry the scale from one location to another for spot checks of several cylinders. An optional ramp aids in the placement of the cylinder on the platform. The cylinder tare weight is preset by the user-the weight of the liquefied contents reads out directly in pounds and kilograms. The tare range is 0-150 lbs. ( 0-68 kg ). The graduated dial is marked in increments of 5 lbs. and 2 kg. Readability is 1 lb. by estimation. Complete information can be obtained from Matheson, 1275 Valley Brook Ave., P.O. Box E, Lyndhurst, NJ 07071.
E. P. Serjeant* and A. G.Warner, Faculty of Military Studies, University of New South Wales, Duntroon, A.C.T. 2600, Australia Anal. Chem., 50 (1978)
Exponential Dilution Flask
1727
Hisakazu Nozoye, National Chemical Laboratory for Industry, 1-1-5, Honmachi, Shibuya-ku, Tokyo, Japan Anal. Chem., 50 [1978)
Preparation of Refutable Permeation Tubes
1728
Angelika Teckentrup and Dieter Klockow,* Department of Chemistry, University of Dortmund, P.O. Box 50 05 00, D-4600 Dortmund 50, German Federal Republic Anal. Chem., 50 (1978)
CIRCLE 139 ON READER SERVICE CARD 1038 A ·
ANALYTICAL CHEMISTRY, VOL. 5 0 , NO. 12, OCTOBER 1978
