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Built-in Carbon-13 Intensity Reference for Solid-State Analysis by Magic-Angle-Spinning Nuclear Magnetic Resonance Spectrometry 2579 Detailed 13 C relaxation a n d calibration e x p e r i m e n t s d e m o n s t r a t e t h a t t h e 13 C N M R signal of t h e " b u i l t - i n " Delrin resonance of a large-sample M A S system can be used as an intensity s t a n d a r d for absolute 13 C spin counting m e a s u r e ments. Ming Zhang and Gary E. Maciel*, Department of Chemistry, Colorado State University, Fort Collins, CO 80523
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Technical Notes Evaporation Device for Continuous Flow Liquid Secondary Ion Mass Spectrometry 2582
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Ming-chuen Shih*, Tao-Chin Lin Wang, and S. P. Markey*, Laboratory of Clinical Science, National Institute of Mental Health, Bethesda, MD 20892
Manual Headspace Method To Analyze for the Volatile Aromatics of Gasoline in Groundwater and Soil Samples
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Valerie D. Roe, Michael J . Lacy, and J a m e s D. Stuart*, Department of Chemistry, U-60, 215 Glenbrook Road, University of Connecticut, Storrs, CT 06269-3060 and Gary A. Robbins, Department of Geology and Geophysics, U-45,345 Mansfield Road, University of Connecticut, Storrs, CT 06269-3045
Comparison of Paraffin Oil and Poly(chlorotrifluoroethylene) Oil Carbon Paste Electrodes in High Organic Content Solvents
2585 Neil D. Danielson*. J u l i e Wangsa, and M a r g a r e t A. Targove, Department of Chemistry, Miami University, Oxford, OH 45056
Versatile Impedance Matching Network for Inductively Coupled Plasma Spectrometry 2589 Akbar Montaser*, Izumi Ishii, and R. H. Clifford, Department of Chemistry, George Washington University, Washington, D.C. 20052, and S. A. Sinex and S. G. Capar, Division of Contaminants Chemistry, Food and Drug Administration, Washington, D.C. 20204
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1252 A · ANALYTICAL CHEMISTRY, VOL. 61, NO. 22, NOVEMBER 15, 1989
