The concentration and size distribution of airborne ferromagnetic particles

Endre Wirth; Franco Prodi

doi:10.3402/tellusa.v24i6.10683

The concentration and size distribution of airborne ferromagnetic particles

Tellus

Volume 24 (1972): Issue 6

By: Endre Wirth and Franco Prodi

Open Access

|Jan 1972

Abstract

A description of a device to remove ferromagnetic particles from an airflow is given. The instrument utilizes several sets of permanent magnets for the creation of a magnetic field of high inhomogeneity. A geometrically similar device without magnets serves as a reference precipitator. The particles were deposited onto electron microscope grids in the precipitators by magnetic and/or other forces. In comparing the size and number of particles on the grids of the precipitators, a “difference” distribution could be constructed. This is regarded as representing the spatial size distribution of airborne ferromagnetic particles. The significance and possible applications of the results are discussed.

References

Bigg , E. K. , Kviz , Z. and Thompson , W. J . 1971 . Electron microscope photographs of extrater-restrial particles. Tellus 23 , 247 – 261 .
Search in Google Scholar Back to article
Crozier , W. D . 1960 . Black, magnetic spherules in sediments. J. Geophys. Res . 65 , 2971 – 2977 .
Search in Google Scholar Back to article
Farlow , N. H. , Ferry , G. V. and Blanchard , M. B . 1970 . Examination of surfaces exposed to a noctilucent cloud, August 1, 1968. J. Geophys. Res . 75 , 6736 – 6750 .
Search in Google Scholar Back to article
Fechtig , H. , Gerloff , U. and Weihrauch , J. H . 1968 . Results of cosmic-dust collection on Luster 1965. J. Geophys. Res . 73 , 5029 – 5037 .
Search in Google Scholar Back to article
Fechtig , H. and Fenerstein , M . 1970 . Particle collec-tion results from a rocket flight on August 1, 1968. J. Geophys. Res . 75 , 6751 – 6757 .
Search in Google Scholar Back to article
Fuchs , N. A . 1964 . The mechanics of aerosols . Per-gamon Press , Oxford and London .
Search in Google Scholar Back to article
Hernenway , C. L. and Soberman , R. K . 1962 . Studies of micrometeorites obtained from a recoverable sounding rocket. The Astronomical Journal 67 , 256 – 266 .
Search in Google Scholar Back to article
Hodge , P. W. and Wright , F. W . 1964 . Studies of particles for extraterrestrial origin. J. Geophys. Res . 69 , 2449 – 2454 .
Search in Google Scholar Back to article
Junge , Ch.E. 1963 . Air chemistry and radioactivity, p. 359 . Academic Press , New York and London .
Search in Google Scholar Back to article
Junge , Ch.E. 1953 . Die Rolle der Aerosol° und der gasförrnigen Beimengungen der Luft im Spuren-stoffhaushalt der Troposphitre. Tellus 5 , 1 – 26 .
Search in Google Scholar Back to article
Kopcewitz , M. and Dzienis , B . 1971 . Mössbauer study of iron in atmospheric air. Tellu,s 23 , 176 – 183 .
Search in Google Scholar Back to article
Kumai , M . 1966 . Microspherules in snow and ice-fog crystals. J. Geophys. .Res . 71 , 3397 – 3404 .
Search in Google Scholar Back to article
Lee , R. E. , Patterson , R. K. and Wagman , J . 1968 . Particle size distribution of metal compounds in urban air. Environmental Science and Technology 2 , 288 – 290 .
Search in Google Scholar Back to article
Magill , P. L. , Holden , F. R. and Ackey , C. (ed.) 1956 . Air Pollution handbook . Academic Press , New York .
Search in Google Scholar Back to article
Prodi , F. and Wirth , E . 1972. Ferromagnetic particles and ice nuclei. Tellus 24 ( 6 ), 1972 , 568 – 574 .
Search in Google Scholar Back to article
Vittori , G. A . 1968/I . Size distribution of airborne magnetic “black spherules” in the 1-5 iz range. PAGEOPH 69 , 360 - 364 .
Search in Google Scholar Back to article
Wright , F. W. , Hodge , P. V. and Langway , C. C., Jr . 1963 . Studies of particles for extraterrestrial origin. 1. Chemical analysis of 118 particles. J. Geophys. Res . 68 , 5575 – 5587 .
Search in Google Scholar Back to article