Pneumoconiosis respirable dust

The percentage of miners showing definite radiographic evidence of either simple or complicated pneumoconiosis has varied considerably in different geographic areas factors responsible for this difference include respirable dust levels, the number of years of exposure, and the physical and chemical composition of the coal. ... 

Carbon in amorphous form used primarily as a fuel, and to produce coal gas, water gas, coke, coal tar, synthetic rubber, and fertilizers.) Chronic exposure to high concentrations may cause pneumoconiosis, bronchitis, and impair the function of the lungs. TLV-TWA 2 mg/m as respirable dust (ACGIH). 

Reguiatory FDA approved for food-contact applies. DOT nonhazardous Properties Wh. to grayish-wh. fine powd. 4.5 median particle size 99.9% thru 325 mesh si. earthy odor sol. in hot, cone, phosphoric acid Insol. in water, cold acids and alkalis sp.gr. 2.7-2.8 dens. 38 Ib/ft (tapped), 14 Ib/ft (loose) oil absorp. 35 brightness 90 pH si. alkaline hardness (Mohs) 1.0-1.5 0.4% max. moisture Toxicology ACGIH TWA/TLV 2 mg/m (respirable dust) inh. of Ig. amts, of dust may cause mucous membrane respiratory tract irritation chronic exposure may cause pulmonary fibrosis, shortness of breath, chronic cough, heart failure, pneumoconiosis tumorigen TSCA listed Precaution Very slippery when wet... 

Particulates that are small enough to find their way into the lungs and remain there, including dusts fine enough to be classified as respirable dusts, can produce serious chronic conditions such as the group of diseases known as pneumoconiosis— lung diseases Uke coal miners black lung disease and silicosis. 

Haney, R., R. Ondrey, R. Stoltz, and D. Chiz. 1988. Overview of respirable dust control for underground coal mines in the United States. Proceedings of the VII International Pneumoconiosis Con/. Vol. 1. Washington, DC U.S. DHHS (NIOSH) 43-45. 

Our eoneems with the induction and exaceibation of respiratoiy diseases encompass bronchitis, emphysema, asthma, and other nonoecupational diseases. (Pneumoconiosis and silicosis are eonsidered diseases due to occupational exposure, rather than to inhalation of ambient air.) The pollutants principally indicted are ozone, sulfur dioxide, nitrogen dioxide, suspended particulate matter, and mixtures of these pollutants. Concern over the effects of suspended partieulate matter on human health is particularly focused on what are called respirable or inhalable partieles, usually detined as particles less than 10 mn in size. Lead dust is the exeeption to the mle that particles must be inhaled to be hazardous to health. Lead... 

Oxman AD, Muir DCF, Shannon HS, Stock SR, Hnizdo A, Lange HJ (1993) Occupational dust exposure and chronic obstructive pulmonary disease - a systematic overview of the evidence. Am Rev Respir Dis 148 38-48 Parkes WR (1994) Pneumoconiosis associated with coal and other carbonaceous materials. In Parkes WR (ed) Occupational lung disorders, 3rd edn. Butterworth-Heine-mann, Oxford, pp 340-410... 

Gilks B, Churg A (1987) Aluminum-induced pulmonary fibrosis do fibers play a role Am Rev Respir Dis 136 176-179 Gloyne SR, Marshall G, Hoyle C (1949) Pneumoconiosis due to graphite dust. Thorax 4 31-38... 

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