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Airborne endotoxins in a rice production commune in The People's Republic of China.

Olenchock-SA; Christiani-DC; Mull-JC; Shen-E; Lu-L
J Toxicol Environ Health 1984 Jan; 13:545-551
A survey of airborne endotoxin concentrations in a rice commune in the Peoples' Republic of China was conducted. Breathing zone samples were analyzed for total dust and endotoxins at a rice commune near Shanghai. Vertical elutriated dust samples were also analyzed. Total dust concentrations ranged from 11.39 milligrams per cubic meter (mg/m3) in the grinding operations to 25.00mg/m3 for waste collection. All samples contained quantifiable endotoxins, ranging from 3.20 nanograms (ng)/mg in sifting operations to 51.19ng/mg in the hulling process. Airborne endotoxin concentrations ranged from 48.56ng/(m3) in the grinding area to 1,341.28ng/m3 in the hulling operation. Vertical elutriated dust concentrations ranged from 3.72mg/m3 in grinding operations to 10.33mg/m3 in the coarse sifting area. The highest endotoxin concentration, 53.33ng/mg, occurred in the hulling area and the lowest, 2.70ng/mg, in the coarse sifting operation. Airborne endotoxin concentrations ranged from 20.83ng/m3 in the grinding area to 450.11ng/m3 in the hulling area. The authors note that rice production in the Peoples' Republic of China is associated with a dust burden contaminated with endotoxin concentrations that are at least as high as those reported for grain storage facilities in other parts of the world. Long term respiratory effects of these dusts should be investigated.
NIOSH-Author; Air-sampling; Respiration; Quantitative-analysis; Exposure-limits; Inhalants; Pulmonary-function; Ventilation; Analytical-methods; Chemical-analysis; Lung
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Journal of Toxicology and Environmental Health