Pneumoconiosis and lung function in a group of kaolin workers.
Sepulveda-J; Vallyathan-V; Attfield-MD; Piacitelli-L; Tucker-JH
Am Rev Respir Dis 1983 Feb; 127(2):231-235
The effect of occupational exposure to kaolin (1318747) was investigated in current and past kaolin mill and mine employees. Comparisons employed in hazard free environments were used. Chest roentgenograms and questionnaires regarding occupational and smoking histories were taken. Pneumoconiosis was considered present if small opacities were observed. Breathing and area samples were collected at different work stations. Dust collected contained 96 percent kaolinite (1318747) and 4 percent titanium-dioxide (13463677). Respirable dust fractions were over 50 percent in areas adjacent to pulverizers and the bag house. Other locations exhibited respirable dust fractions of 10 to 20 percent. Personal samples were below what is considered the nuisance particulate threshold limit. No free silica (7631869) was found. Total dust exceeded 10 milligrams per cubic meter (mg/m3) in three of five work stations. Dust of work sites of comparisons were between 0.16 and among current kaolin workers and 19 percent in former workers. Significant reduction of forced vital capacity, forced expiratory volume, and peak flow rate were noted among kaolin workers. Pneumoconiosis was found only in workers who currently smoked or were former smokers. The authors suggest that controlled epidemiologic studies among kaolin workers are needed to produce pneumoconiotic data and to study the impact of dust on pulmonary exposure.
NIOSH-Author; Analytical-methods; Pulmonary-function; Respiration; Respiratory-protection; Air-contamination; Pulmonary-system-disorders; Respiratory-irritants; Quantitative-analysis; Humans
1318-74-7; 1318-74-7; 13463-67-7; 7631-86-9
American Review of Respiratory Disease