Airborne endotoxin concentrations in various work areas within two cotton textile mills in the People's Republic of China.
Olenchock-SA; Christiani-DC; Mull-JC; Ye-T; Lu-L
Biomed Environ Sci 1990; 3(4):443-451
Airborne endotoxin concentrations in various work areas in two cotton mills in the People's Republic of China were investigated. Environmental and breathing zone samples were collected in the opening, cleaning, carding, drawing, roving, combing, and spinning areas of two cotton mills in Shanghai. Total dust and endotoxin concentrations were determined. The data were compared with results of a similar study 5 years previously. Total dust samples collected by the elutriators ranged from 0.34 to 1.56mg/m3 in mill 1 and from 1 ranged from 3313.14 to 18627.52 endotoxin units per milligram (EU/mg) and in mill 2 from 525.77 to 5490.69EU/mg. Ambient air endotoxin concentrations ranged from 1636.76 to 7636.78Eu/mg in mill 1 and from 131.29 to 9570.37EU/mg in mill 2. The highest endotoxin concentrations occurred in the carding and cleaning areas. Ambient air endotoxin concentrations in mill 1 ranged from nondetectable in the roving and combing areas to 16604.12EU/mg in the opening area. Air endotoxin concentrations in mill 2 ranged from 88.06EU/mg in the spinning area to 7193.07EU in the drawing area. The dust concentrations were generally lower in most areas than in the previous study; however, the endotoxin concentrations were generally higher. The authors conclude that endotoxin exposures of the workers at the mills are generally higher than they were 5 years previously, despite decreases in dust exposures. These elevated endotoxin exposures present a potential respiratory hazard.
NIOSH-Author; Textile-mills; Cotton-dust; Occupational-exposure; Industrial-hygiene; Endotoxins; Toxins; Cotton-industry; Workplace-studies
Biomedical and Environmental Sciences