Letter | Published:

Radioactive Labelling of Membrane Filters for the Assay of Air-borne Material

Naturevolume 187pages930931 (1960) | Download Citation



THE quantitative assessment of air-borne material with membrane filters is being widely employed, mainly because of their high collection, efficiency, non-hydroscopic properties and more uniform particle deposition than on other filter materials1. Since most of the particles deposited are held at the surface2, the classical methods of assessment of deposits can be-replaced or augmented by indirect methods. The latter consist, for example, in estimating the amount of deposit material by comparing stains3 with suitable-standards or by objective measurement as, for example, reflectance photometry4. Chemical reaction between suitably impregnated or wetted filters and aerosol droplets may also be employed with quantitative estimation of the resulting colour effects5.

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  1. 1

    Spurný, K., and Vondráček, V., Chem. listy, 50, 1331 (1956).

  2. 2

    Kubie, G., Jech, C., and Spurný, K., Coll. Czechoslov. Chem. Comm. (in the press).

  3. 3

    Spurný, K., Prac. lékarství, 11, 197 (1959).

  4. 4

    Paulus, H. J., Talvitie, N. A., Fraser, D. A., and Keenan, R. G., Indust. Hyg. Quart., 18, 267 (1957).

  5. 5

    Lodge, J. P., and Tufts, B. J., Tellus, 7, 2 (1956).

  6. 6

    Spurný, K., Chem. listy (in the press).

  7. 7

    Stephan, D. G., Bohnslav, P. T., Herrick, R. A., Walsh, G. W., and Rose, jun., A. H., Amer. Indust. Hyg. Assoc. J., 19, 276 (1958).

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  1. Mining Institute, Czechoslovak Academy of Sciences, Prague, 8

    • G. KUBIE
  2. Institute of Physical Chemistry, Czechoslovak Academy of Sciences, Prague, 12

    • K. SPURNÝ


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