X, N or DETECTOR:
$5999 (includes installation kit) Performance: This new Model 4420 electrolytic conductivity detector for SELECTIVE your GC selectively detects halogen, sulfur and nitrogen compounds. Sensitivity is up to 20 times that of any other electrolytic conductivity detector. Perfect for both capillary and conventional packed columns.
tutes a chicken-and-egg argument. At any given point in time, the driving force may be greater from one direc tion than from the other. In one case the driving force is intellectual, in an other technological. Where we stand in this continuum at present is hard to say, but analytical chemists can profit from forces in either direction. Analyt ical problems should be selected both for their intellectual challenge and for their practical potential. This, more than anything else, separates analyti cal chemists from their colleagues in other fields of chemistry. Keeping the importance of this double focus in mind is essential to the healthy growth and well-being of our science. Acknowledgment
Compatibility: The 4420 is manufactured in ten different versions, each specifically engineered for neat installation and full compatibility with major gc's of the following types: HP 5790, 5890, 5880: PE Sigma 1-4, 300, 2000, and 8300; TRACOR 540, 560, 565 and 570; Varian 3300, 3400, 3700, and Vista series; Shimadzu; and IBM. Installs in 10 minutes.
The author gratefully acknowledges research support from the National Science Foundation, the U.S. Depart ment of Energy, the Office of Naval Research, and the Petroleum Re search Fund of the American Chemi cal Society.
Buy one: Write or call for a detailed brochure, including representative chromatograms. Phone 409-690-1711. P.O. Box 2980, College Station, TX 77841-2980.
References
O.I.CORPORATION CIRCLE 156 ON READER SERVICE CARD
(1) Siegbahn, K.; Edvarson, K. Nuclear Phys. 1956,1,137-59. (2) Hagstrom, S.; Nordling, C; Siegbahn, Κ. Z. Physik. 1964,178,433-38. (3) Hagstrom, S.; Nordling, C; Siegbahn, Κ. Z. Physik. 1964,178,439-44. (4) Hagstrom, S.; Nordling, C.; Siegbahn, K. Phys. Lett. 1964,9, 235-36. (5) Benninghoven, A. Ann. Phys. 1965,15, 113-43. (6) Smith, D. P. J. Appl. Phys. 1967,38, 340-47. (7) Harris, L. A. J. Appl. Phys. 1986,39, 1419-27. (8) Kerkhof, F.; Moulijn, J. J. Phys. Chem. 1979,83,1612-19.
most chemists in the US. belong to the American Chemical Society. The fact is. there are more than 134.000 chemists in this vital, career-enhancing society — the largest single-discipline scientific organization in the world dedicated to chemistry-related sciences! To learn those reasons, CALL TOLL FREE 1-800-424-6747 or mail this card to: American Chemical Society, Membership Division 1155 Sixteenth St., NW, Washington, DC 20036
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1190 A · ANALYTICAL CHEMISTRY, VOL. 58, NO. 12, OCTOBER 1986
David M. Hercules received his B.S. degree from Juniata College in 1954 and his Ph.D. from MIT in 1957; his thesis research was performed under L. B. Rogers. He has served on the faculties of Lehigh University, Juni ata College, MIT, and the University of Georgia. He is currently professor of chemistry and chairman of the de partment at the University of Pitts burgh. His major research interests include the analytical chemistry of surfaces and solid-state mass spec trometry.
