| 저자(한글) |
오세욱,김종혁,이웅기,이용식,정호철,조일형,김영환,변상훈,고려대학교,연세대학교,고려대학교,고려대학교,고려대학교,고려대학교,고려대학교,고려대학교 |
| 초록 |
Bioaerosol monitoring was undertaken in 9 engine plants.Bulk in-use metal working fluids(MWF) samples werecollected at the machining sites and compared with airmeasurements at the same sites. Gravimetric concentrationof oil mist averaged 0.33 / . Endotoxin concentration ㎎㎥ranged from 270 to 290,500 endotoxin unit(EU)/ in the ㎖bulk MWF and from 14 to 790 EU/ in air. Airborn microbe ㎥concentrations were from 38 to 42,500 colony-formingunits(CFU)/ . ㎥Concentrations of endotoxin in the MWF were significantlycorrelated with airborne Heterotropic Plate Count(HPC)(r=0.64, p<0.0019). And the significant relationships betweenpH and airborne HPC(r=-0.50, p<0.001) and between pH and airborne endotoxins(r=-0.67,p<0.001) were also observed.The predominant bacteria species in MWF were Pseudomonasspp., Streptococcus spp., Staphylococcus spp.,Serratia marcescens, Providencia rettgeriin order. Hazardousagents emitted by using water-soluble MWF seems to becorrelated microbial growth. In order to minimize worker'sexposure to several hazardous agents by an water-solubleMWF, microbial growth must be controlled to the lowest levelas possible. Administrative control as well as engineeringcontrol must comprehensively be applied to control microbe'sgrowth in water-soluble MWF. |
