Characteristics of Polycyclic Aromatic Hydrocarbons, Metals, and Reactive Oxygen Species in Oil mists found in the Workplace Atmosphere of a Fastener Manufacturing Industry

• Main Authors: Yu-jiuan Lin, 林于娟
• Other Authors: Peng-jr Tsai
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/42724314998910517324

碩士 === 國立成功大學 === 環境醫學研究所 === 97 === Metalworking fluids (MWFs) are used recycling in fastener manufacturing industries. Oil mists found in the workplace are formed via the impaction of MWFs and heating- evaporation- condensation process caused by the frictions of machines. MWFs are made of the hydrocarbons, containing polycyclic aromatic hydrocarbons (PAHs), organic compounds, and metal elements. Recycling of MWFs lead to the accumulation of their PAH and metal contents. Workers exposed to oil mists could cause adverse health effects. Studies have indicated that adverse health effects may derive from not only PAHs and metals but also oxidative stress, initiated by the formation of reactive oxygen species (ROS). The formation mechanism of ROS on particles may relate to PAHs and metals. The objective of this study is to determine the impact associated with the change of MWFs on oil mists, PAHs, metals and ROS concentration in the workplace at the different period of metalworking fluids in the threading process. The eight-stage cascade impacter (Marple 298) was used in static sampling to collect particle and segregate particles in sizes. The collected particles were pretreated for analyzing their chemical compositions including metals, PAHs, and ROS. The results show particle size distributions of oil mists occurred in the workplace were dominated by the fine mode (86.0-88.6%) for samples collected at the different of metalworking fluids. And particle size distributions weren’t influenced by the production rate. PAHs concentrations of coarse particles in the workplace were dominated by the HMW-PAHs at the different period of metalworking fluids; PAHs concentrations of fine particles were dominated by the LMW-PAHs; Total PAHs concentrations were dominated by the fine particles. The longer MWFs were used, more amounts of PAHs concentration were found. The longer MWFs were used, the less the amounts of LMW-PAHs concentration could be found. The longer MWFs were used, more amounts of MMW-PAHs and HMW-PAHs concentration were found. The results show the same trend with the different molecular weight PAHs in MWFs. The longer MWFs were used, more amounts of metals concentration were produced. The results have the same trend with metals concentration in MWFs. The longer MWFs were used, higher ROS concentration were produced. The relationship between the different molecular weight PAHs and metals concentrations and ROS concentrations was determined. The result found that the combination of both coarse particles and fine particles of total PAHs could explain the variations of ROS concentrations up to 51%. The combination of both coarse particles of Fe and Na could explain the variations of ROS concentrations up to 92%. By conducting regression analyses, this study found that the production rate would be able to explain the variations of LMW-, MMW-, HMW-PAHs, and metals concentrations up to 70.0%, 78.0%, and 85.0%. The above result clearly indicates that the predicable model was a useful method for assessing LMW-, MMW-, HMW-PAHs, metals and ROS concentration in the workplace. In conclusion, the longer MWFs was used, more LMW-, MMW-, HMW-PAHs, metals and ROS concentrations were produced suggesting that appropriate air pollution control devices should be used in this industry immediatedly.