The Proportion of Long Fibres in Attapulgite and Sepiolite Containing Adsorption Granulates.
Rodelsperger-K; Bruckel-B; Woitowitz-J; Pott-F; Strubel-G
NIOSH 1990 Sep:554-558
An investigation was conducted which evaluated the mineralogical composition and the content of fibers with a length of more than 5 micrometers of adsorption granulates used as animal bedding. The mineralogical composition of 75 commercially available samples of adsorption granulates used as animal bedding was examined by means of X-ray diffraction, polarization and phase contrast microscopy, and differential thermoanalysis. The concentration of fine fibers longer than 5 micrometers in adsorption granulates composed of attapulgite (12174117) and/or sepiolite (63800373) was lower, with a factor of four to 100 in the majority of the samples, than concentrations significantly carcinogenic in injection experiments. Only one animal experiment with a relatively high number of long sepiolite fibers demonstrated a lower carcinogenic effect than experiments with long attapulgite fibers. The main component of adsorption granulates often resembled attapulgite. It was recommended that the physical properties and biological effects of fibrous clays be investigated before deposits are handled.
Mineral-dusts; Airborne-dusts; Fibrous-bodies; Air-sampling; Analytical-methods; Dust-exposure; Silica-dusts; Lung-cells; Cell-function;
DHHS (NIOSH) Publication No. 90-108
Proceedings of the VIIth International Pneumoconioses Conference