A Monumental Study - Reconstruction of a 1920 Granite Shed.
Ayer-HE; Dement-JM; Busch-KA; Ashe-HB; Levadie-BT; DeBerardinis-L
Transactions of the Thirty-Fourth Annual Meeting of the American Conference of Governmental Industrial Hygienists, San Francisco, California, May 14-16, 1972 1972 May:91-102
As part of an ongoing study of present day granite cutters in Barre, Vermont, the conditions of the 1920s were recreated in a closed granite shed so that respirable mass measurement could be related to former conditions known to produce silicosis. Four granite cutters and a foreman were to work for a week in the shed, using none of the available ventilation equipment. All personnel used respirators approved for pneumoconiosis producing dusts. Respirable mass samples were taken with three sizes of horizontal elutriator samplers and three sizes of cyclone samplers. One purpose of the study was to compare respirable mass by different methods and compare respirable mass and respirable free silica (14808607 ) with impinger count concentrations. Neither the differences in results between the Isleworth (MRE) sampler and the 10 liters per minute horizontal elutriator, nor the differences between the 1.7 liters per minute cyclone and 10 liters per minute cyclone were statistically significant. The findings from this study seemed to support the threshold limit values presently suggested. The findings do not, however, support the present TLV as being absolutely safe. The average respirable free silica concentrations in the sheds now are less than half the TLV, and yet there is some suggestion that roentgenographic and slight pulmonary function changes may be occurring in some workers.
Mineral-dusts; Occupational-exposure; Respirable-dust; Airborne-dusts; Silica-dusts; Exposure-levels; Stone-grinders;
Transactions of the Thirty-Fourth Annual Meeting of the American Conference of Governmental Industrial Hygienists, San Francisco, California, May 14-16, 1972