GAS FACTS published periodically limit values (TLV's) for hazfor analytical chemists ardous materials, safety
checks, illustrations and descriptions of CGA valve outlets and connections. Reprints of papers discussing safety in handling compressed and liquefied gases are also made Someone once described a available by Scott. And safety laboratory as an accident training workshops can be waiting to happen. Actually, analytical chemists have good held in your own laboratory safety records and also have a to inculcate good practices into newly recruited personunique appreciation for the potency of chemical species at nel and review them for experienced bench workers. All very low concentrations. of these materials and activities are provided by Scott without charge.
Safety in the laboratory
Information when you need it—fast!
Both new and experienced bench workers can benefit from a Scott gas safety training workshop.
Suppliers of specialty gases have been in the forefront of laboratory safety programs. They have actively cooperated with educators, industrial hygienists and safety personnel in setting up and maintaining high standards in the laboratory. The Scott catalog, for example, provides lists of threshold
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Did you know that Scott also has an information hotline? If you have questions about the compatibility of equipment and tubing with certain gases —if the valve outlet on a cylinder doesn't mate with the inlet of a regulator—if you want to know OSHA limits for a g a s call Scott toll-free for guidance. There is no obligation. And remember too, that you can use the same number to order the highest quality calibration mixtures, pure gases and gas handling equipment. (If you don't have your personal copy of the Scott catalog, request it today.)
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CIRCLE 150 ON READER SERVICE CARD 428 A · ANALYTICAL CHEMISTRY, VOL. 60, NO. 7, APRIL 1, 1988
BRIEFS Directly Coupled Liquid Chromatography/Fluorine-19 Fourier Transform Nuclear Magnetic Resonance 675 LC/ 1 !!- and LC/ 19 F-NMR detection approaches are compared using fluorine-tagged mixtures of simple alcohols and phenols. The phase-alternated decoupling sequence MLEV16 is effectively applied to 19F to reduce spectral complexity. L. A. Allen, M. P. Spratt, T. E. Glass, and H. C. Dorn*, Chemistry Department, Virginia Polytechnic Institute and State University, Blacksburg, Va. 24061 Anal. Chem., 60 (1988)
Computer-Controlled Source for Atomic Emission Spectrometry
679
A general-purpose atomic emission source based on the microarc is described. Detection limits for representative elements are reported together with an investigation of interferences caused by easily ionized elements. Henry Aryamanya-Mugisha, Ronald R. Williams*, and Robert B. Green, Department of Chemistry, Ohio University, Athens, Ohio 45701 Anal. Chem., 60 (1988)
Total Reflection Energy-Dispersive X-ray Fluorescence Spectrometry Using Monochromatic Synchrotron Radiation: Application to Selenium in Rlood Serum 684 Parts-per-billion minimum detection limits are measured for selenium in blood serum, in NBS-SRM 1598 (bovine serum), and in NBS-SRM 1643b (trace elements in water) using monochromatic synchrotron radiation in the total reflection geometry. P. A. Pella*, Center for Analytical Chemistry, National Bureau of Standards, Gaithersburg, Md. 20899, and R. C. Dobbyn, Institute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Md. 20899 Anal. Chem., 60 (1988)
Determination of Trace Metals in Marine Biological Reference Materials by Inductively Coupled Plasma Mass Spectrometry 687 Thirteen elements (Ns, Mg, Cr, Fe, Mn, Co, Ni, Cu, Zn, As, Cd, Hg, and Pb) are determined in the marine biological reference materials DOLT-1 and DORM-1. Accurate results are obtained by standard additions or isotope dilution for all these elements in DORM-1 and for all but Cr in DOLT-1. Diane Beauchemin*, J. W. McLaren, S. N. Willie, and S. S. Berman, Analytical Chemistry Section, Chemistry Division, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R9 Anal. Chem., 60 (1988)
The Role of Metastable Atoms in Glow Discharge Ionization Processes 691 Ionization processes are studied in a glow discharge using neon and argon discharge gases. The effects of using a tunable laser to depopulate metastable ion populations are investigated by optical galvanic spectroscopy and mass spectrometry. The results provide evidence for the role of Penning ionization in the glow discharge. K. R. Hess and W. W. Harrison*, Department of Chemistry, University of Virginia, Charlottesville, Va. 22901 Anal. Chem., 60 (1988)
