absorbing volume a t t h e peak of t h e absorbance pulse a n d t h e integral value of t h e effective length of t h e a b sorbing volume. T h e m i n i m u m crosssectional area will be determined by t h e t h r o u g h p u t of t h e emission source radiation. • T h e atomizer t u b e should be of m i n i m u m mass t o maximize its rate of heating. References (1) G. F. Kirkbright, Analyst (London), 96,609 (1971). (2) A. Syty, Crit. Rev. Anal. Chem., 4,155 (1974). (3) R. Woodriff, Appl. Spectrosc, 28,413 (1974). (4) G. M. Hieftje, T. R. Copeland, and D. R. deOlivares, Anal. Chem., 48,142R (1976). (5) B. V. L'vov, "Atomic Absorption Spectrochemical Methods of Analysis", Adam Hilger, London, England, 1970. (6) If. Massmann, Spectrochim. Acta, 23B, 215 (1968). (7) R. E. Sturgeon, C. L. Chakrabarti, I. S. Maines, and P. C. Bertels, Anal. Chem., 47,1240 (1975). (8) R. E. Sturgeon, C. L. Chakrabarti, and P. C. Bertels, ibid., p 1250. (9) R. E. Sturgeon, C. L. Chakrabarti, and C. H. Langford, ibid., 48,1792 (1976). (10) R. E. Sturgeon and C. L. Chakrabarti, ibid., 49, 90 (1977). (11) R. E. Sturgeon and C. L. Chakrabarti, Spectrochim. Acta, 32B, 231 (1977). (12) I. Reif, V. A. Fassel, and R. N. Kniseley, ibid., 31B, 377 (1976). (13) R. E. Sturgeon and C. L. Chakrabarti, Anal. Chem., 49,1100 (1977). (14) B. V. L'vov, Zh. Prikl. Spektrosk., 8, 517 (1968). (15) B. V. L'vov, D. A. Katskov, and G. G. Lebedev, ibid., 9,558 (1968). (16) D. A. Katskov and B. V. L'vov, ibid., 15,783(1971). (17) V. P. Borzov, B. V. L'vov, and G. V. Plyushch, ibid., 11, 217 (1969). (18) R. E. Sturgeon, PhD thesis, Carleton University, Ottawa, Ont., Canada, 1977. (19) B. V. L'vov, "Electrothermal Atomization—The Way Towards Absolute Methods of Atomic Absorption Analysis", presented at the 3rd Federation of Analytical Chemistry and Spectroscopy Societies Conference and the 6th International Conference on Atomic Spectroscopy, Philadelphia, Pa., Nov. 15-19, 1976. (20) K. Ohta and M. Suzuki, Talanta, 23, 560 (1976). (21) J.G.T. Regan and J. Warren, Analyst (London), 101, 220 (1976).
Ralph Sturgeon is a research associate with the Division of Chemistry of the National Research Council of Canada (Ottawa). His current research interests focus on the development of suitable standards to be used in the analysis of marine samples for a variety of trace metals.
37C±0J5C AND A FREE DUCK Buy a bath for your lab the way you buy a bath for your rubber duck. Buy it t o last 20 years. Precision baths are constructed of one-piece, deep-drawn stainless steel chambers, with no welds or seams to wear or weaken. Buy guaranteed temperature. The model 184, shown here, is measured in five places for ±.15°C
uniformity at 37°C and at 56°C. Buy a name you can trust. Precision. We've built more baths than anyone else... for forty years. Free Duck. Just for sending for the world's most complete catalog of laboratory baths, we'll send you a free duck. Write Precision Scientific Group, 3737 West Cortland Street, Chicago, Illinois 60647.
C O N S T A N T TEMPERATURE TAKES
PRECISION™ CIRCLE 85 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 49, NO. 14, DECEMBER 1977 • 1267 A
