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KMID : 1039220210310040461
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Journal of Korean Society of Occupational and Environmental Hygiene
2021 Volume.31 No. 4 p.461 ~ p.472
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Ratio of Elemental Carbon Concentrations for Respective Measurement Locations according to the Sampler
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Cha Won-Seok
Kim Eun-Young
Choi Sung-Won
Choi Soo-Yeon
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Abstract
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Objectives: This study was conducted to determine the differences in EC concentrations according to the type of sampler by measuring and analyzing EC.
Methods: Elemental carbon was measured in diesel engine vehicles and at the roadside. Using NIOSH method 5040, a cassette was coupled to 37 ㎜ and 27 ㎜ quartz filters and measurements were performed 21 times. There were 14 types of measurement methods, and polystyrene, polypropylene, and metal samplers were evenly placed inside the movable chamber.
Results: The results measured using the 37 ㎜ conductive cassette (closed/open) and the IOM sampler made of conductive materials showed a higher ratio than the other results. When the 37 ㎜ conductive cassette was measured with the lid open, it showed a statistically significantly higher ratio than with other measurement methods (p<0.05).
Conclusions: Checking the EC concentration a total of 21 times at each ratio based on the concentration of the 3-stage polystyrene cassette, it was statistically significantly higher when the 37 ㎜ conductive cassette was open. This same cassette also showed a slightly higher EC concentration when closed. It was ascertained that some DEE was collected on the cassette wall surface due to the electrical conductivity of the polystyrene cassette, resulting in sample loss. Since EC is composed of fine particles, it is thought that electrical conductivity may affect its concentration.
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KEYWORD
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Diesel engine exhaust, elemental carbon, electrical conductivity
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