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3658760 
Technical Report 
Chemical and Physical Characterization of Amosite, Chrysotile, Crocidolite, and Nonfibrous Tremolite for Oral Ingestion Studies by the National Institute of Environmental Health Sciences 
Campbell, WJ; Huggins, CW; Wylie, AG 
1980 
NIOSH/00193277 
U 
English 
The characterization procedures used and results obtained in the analysis of five different asbestos type materials were discussed. These various asbestos type materials were to be studied for their biological effects after oral ingestion, once they were well characterized. The samples examined included amosite (12172735), short and long fiber chrysotile (12001295), crocidolite (12001284) and nonfibrous tremolite (14567738). This investigation was prompted by the lack of data regarding the effects of ingested asbestos particles or fibers. An elemental analysis was performed on each of these five samples by optical emission spectroscopy. Some of the physical characteristics determined included surface area, density, and particle size. X-ray diffraction was employed to determine sample purity, detecting the presence of other minerals. Infrared spectroscopy, thermogravimetric analysis, and differential thermal analysis were also used in the characterization of each sample. Optical, scanning electron and transmission electron microscopy were also used.