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KMID : 0895420140240030300
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Journal of Korean Society of Occupational and Enviromental Hygiene
2014 Volume.24 No. 3 p.300 ~ p.309
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Microbial Assessment in Metal-Working Fluids Handling Industry
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Park Hyun-Hee
Park Dong-Jin
Pakr Hae-Dong
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Abstract
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Objectives: The objective of this study is to evaluate microbial exposure hazards in the metal-working fluids(MWF) handling industry.
Methods: Air quality parameters(airborne bacteria, fungi, endotoxin and oil mist) and bulk MWF in storage tanks were evaluated at 54 points at nine sites in South Korea.
Results: The geometric means(GM) of culturable airborne bacteria, fungi, endotoxin and oil mist concentration were 133 CFU/㎥ (n=376, range 7~6,510 CFU/㎥), 159 CFU/㎥(n=381, range 7~8,469 CFU/㎥), 8.06 EU/㎥(n=103, range 0.34~280.4 EU/㎥) and 0.20 mg/㎥(n=104, range 0.01~2.87 mg/㎥), respectively. The ratio of indoor to outdoor concentration was 2.7 for bacteria, 6.1 for endotoxin, and 4.8 for oil mist. Even though average airborne bacteria concentration did not exceed recommended exposure limits(1,000 CFU/㎥), MWF in the storage tanks was highly contaminated with bacteria(arithmetic mean 2.1×106 CFU/ml) and exceeded recommended bacteria limits(105 CFU/ml).
Conclusions: It is necessary for MWF handling workplaces to conduct periodical biohazard inspection of MWF storage tanks. Additionally, further research may be necessary to establish biological occupational exposure limits.
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KEYWORD
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bioaerosols, biological agents, microbial risk, metal-working fluids, endotoxin
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