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수용성 절삭유(Water-Soluble Metalworking Fluids)에서 분석한 MEA, DEA, TEA의 농도 분포 특성 및 질안전보건자료(MSDS) 에 대한 정확성 평가
이권섭 ( Kwon Seob Lee ),선옥남 ( Ok Nam Sun ),윤경섭 ( Kyung Sup Yoon ),박동욱 ( Dong Uk Park ) 한국산업위생학회 2005 한국산업보건학회지 Vol.15 No.1
This study was carried to assess the accuracy of material safety data sheets (MSDS) for some water-soluble metalworking fluid (MWF) with respect to monoethanolamine(MEA), di-ethanolamine(DEA) and tri-ethanolamine(TEA). 39 fresh and 52 used MWFs for this study were taken from the workplace. The quantification and qualification of MEA, DEA and TEA were done using ion-chromatography. Three main findings of this study were 1) EA that was not addressed in material safety & data sheets (MSDS) was found to be enough higher than 1% , 2) 33.3% of 39 fresh MWF showed ingredient and concentration of MEA, DEA and TEA in MSDS and 3) the concentrations of MEA(20.5%), DEA(41.3%) and TEA(15.4%) were much higher than those indicated in MSDS. Consequently, we concluded that the accuracy on ingredients and concentrations of MEA, DEA and TEA provided in MWF was very low. Our study recommends that the limit concentration of chemical except for carcinogen that employer has to indicate in MSDS should be lowered from 1% to 0.1%.
최상준 ( Sang Jun Choi ),선옥남 ( Ok Nam Sun ),전용희 ( Yeon Hee Jeong ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1
This study was conducted to characterize workers` exposure to styrene by job and task in laminating process for manufacturing double walled tank with Fiber-Reinforced Plastics (FRP). We identified styrene in raw materials such as unsaturated polyester resin (UPR), hardner, toner, and cleaner by gas chromatography with mass spectrometer. Personal samples for airborne styrene and mandelic acid in urine were sampled and analyzed by gas chromatography with a flame ionized detector and high performance liquid chromatography with ultraviolet detector, respectively. A major emission source of styrene was UPR which contained 37 % styrene by weight. Full shift exposure levels of styrene in air for sprayer and helper exceeded occupational exposure limit in Korea (20 ppm). Short term exposure level of styrene for spraying with FRP ranged from 45.9 ppm to 86.1 ppm, significantly higher than the case without FRP (p<0.01). The highest exposure to styrene was shown during the first coating with FRP which correspondingly represents the process that calls for precaution. Urine mandelic acid concentration did not exceed the biological exposure index, which is attributable to the practice of wearing air purifying respirator. It was indicated that workers in laminating process with FRP are exposed to styrene at high levels. They should wear personal respirator with properly replaced cartridge based on service life. The service life of mask used in this study is estimated as 8 days based on the airborne styrene concentration of 50 ppm.