the measured and calculated tracer concentrations. Future work We now know quite a bit about tag ging fly ash particles. Clearly, the choice of technique depends on the goals of the experiment. The concept of enriched rare-earth tracers should benefit the study of dry particle dep osition and a variety of other atmo spheric phenomena. For example, we have been able to directly measure the deposition of submicrometer par ticles on the surfaces of soybean leaves using tracer particles contain ing 10-ppm-enriched 148 Nd. Cur rently, in collaboration with EPA, we are using enriched isotopes of Sm to determine the contributions of res idential heating oil combustion and diesel motor vehicles to airborne mu tagens. We thank Joseph H. Shinn and Lynn R. Anspaugh of Lawrence Livermore National Laboratory for the use of stack sampling equip ment. This work was conducted with funding from the Electric Power Research Institute and the State of Maryland's Power Plant Research Program under contract numbers RP2199-03 and PR88-108-004, respectively.
(14)LeCompte-Salisbury, C; Tuncel, G.; Ondov, J. M., unpublished results. (15) Ondov, J. M.; Kelly, W. R. Technical Report No. EN-7384, Enriched RareEarth Isotopes as Tracers of Airborne Emis sions from Coal-Fired Power Plants, EPRI: Palo Alto, CA, in press.
References
(l)Dietz, R. Ν.; Dabberdt, W. F. Gaseous Tracer Technology and Applications; De partment of Applied Science, Brookhaven National Laboratory: Upton, NY, July 1983. (2) Cowan, G. Α.; Ott, D. G.; Turkevitch, Α.; Machta, L.; Ferber, G. J.; Daly, N. R. Science 1976, 191, 1048-50. (3) Fowler, M. M.; Barr, S. Atmos. Environ. 1983, 17, 1677-85. (4) Lewis, C. W.; Stevens, R. K. Atmos. En viron. 1985, 19, 917-24. (5) Gordon, G. E. Environ. Set. Technol. 1988,22, 1132. (6) Leighton, P. Α.; Perkins, W. Α.; Grinnel, S. W.; Webster, W. X. /. Appl. Meteorol. 1965, 4, 334-48. (7) Schultz, E. J.; Duffee, R. A; Mitchell, John M. Ondov (left) received his B.S. de R. I.; Ungar, E. W. Am. Ind. Hyg. J. 1960, gree from Muhlenberg College (PA) in 21, 343-49. 1970 and hL· Ph.D. in chemistry in 1974 (8)Horvath, H.; Dreiner, I.; Norek, C ; Preining, O. Atmos. Environ. 1988, 22, from the University of Maryland under the 1255-69. direction of William H. Zoller. His research (9) Kelly, W. R; Ondov, J. M. Atmos. Envi interests include the development of meth ron. 1990, 24, 467-74. ods to study the fate of aerosol particles. (10) Ondov, J. M. In Proceedings of the 3rd Chemical Congress of North America, June W. Robert Kelly received his B.S. degree 5-10, 1988, Toronto. (11) Wasserburg, G. J.; Jacobsen, S. B.; from Old Dominion University (VA) in 1968 and his Ph.D. in geochemistry in DePaolo, D. J.; McCulloch, M. T.; Wen, T. Geochim. Cosmochim. Acta, 1981, 45, 1974 from Arizona State University un 2311-23 der the direction of Carleton B. Moore. (12)Gelbard, F.; Seinfeld, J. H. / Colloid His research interests include the applica Interface Sci. 1980, 78, 485-501. tion of high-precision TIMS to environ (13) Kim, D. Y.; Marshall, W. R, Jr. mental and geochemical problems. AIChEJ. 1971, 17, 575-84.
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