The preparation and characterization of analytical reference minerals for monitoring of workplace contaminants are discussed. The purity, particle size, and characterization of 18 reference minerals are summarized. The abundance, sites of occurrence, and purity of material deposits of the 18 reference minerals are described, and mineral specimen sources obtained from mineral and industrial suppliers, museums, the National Stockpile synthesis, and field sampling are listed. Cristobalite and tridymite synthesis and phase confirmation analyses are described. Selection procedures of the best mineral samples as standards by macroscopic evaluation, polarized light microscopy (PLM), x-ray diffraction, and differential thermal analysis are summarized. Beneficiation procedures to remove residual impurities and size reduction to desired particle size are described. Two sizing methods, optical microscopy and MICROTRAC analysis, which were used to monitor particle size distribution, are described and results are summarized. PLM, which identified and quantitated mineral phase impurities, is described and results are summarized along with x-ray diffraction results.
NIOSH, U.S. Department of H.E.W., Cincinnati, Ohio, 209 paes, 43 references