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채정석,박경려,전준민,이재영 한국도시환경학회 2020 한국도시환경학회지 Vol.20 No.1
The purpose of this study is to investigate the distribution of heavy metal concentrations in embient of residential areas near Gwangyang Industrial Complex. The heavy metal measuring points were selected as Taein-dong, Geumho-dong and Myododong. Sampling was carried out for 7 days in each season by sampling for 24 hours from 10 AM to 10 AM the next day at all measurement points during the four seasons. The analysis of this study showed that most heavy metals are within the permissible levels. In addition, there was no difference in seasonal fluctuation according to heavy metal components, indicating that all of the survey points in this study were in the same area of influence due to seasonal wind direction. The average enrichment factor of Cd, Cr, Ni, Pb and Zn is over 10, which can be evaluated as a heavy metal component with high pollution level by artificial sources. The results of evaluating the pollution index using domestic and foreign air quality standards exceed 14.3%, and the average of the pollution index was 0.61 to 0.62. These results showed that the level of heavy metal pollution in the residential area was not high. However, the heavy metal contamination effect caused by anthropogenic sources suggests that continuous monitoring is necessary from the acceptor's point of view. 본 연구에서는 광양산업단지 인근 주거지역을 대상으로 대기 중 중금속 농도 분포 특성을 파악코자 하였다. 중금속 측정지점은 태인동, 금호동과 묘도동으로 선정하였다. 시료채취는 4계절 동안 전 측정지점에서 오전 10시에서 익일 오전10시까지 24시간 동안 채취하는 방법으로 각 계절별 7일간 연속 측정하였다. 분석결과, 대부분의 중금속이 기준치 이내로 나타났다. 또한 중금속 성분별에 따른 계절별 변동 양상에 차이를 보이지 않아 본 연구의 조사지점 모두 계절적 풍향에 의한 동일한 영향권에 있는 것으로 나타났다. As, Cd, Cr, Ni, Pb, Zn은 평균 농축계수가 10이상으로 나타나 인위적배출원에 의한 오염도가 높은 중금속 성분으로 평가되었다. 국내외 대기환경기준치로 오염지수를 평가한 결과, 오염지수1을 기준으로 14.3%가 초과됐으며, 오염지수 평균은 0.61~0.62로 나타났다. 이러한 결과를 통해 본 주거지역의 중금속오염도는 높지 않은 결과를 보였으나, 인위적 배출원에 의한 중금속 오염 영향이 있는 만큼 수용체 입장에서 지속적인 모니터링은 필요할 것으로 판단된다.
축류형 사이클론을 이용한 공기역학경과 광학직경 상관관계 분석에 관한 연구
김은정,박경려,허지은,조철희,조윤행 한국입자에어로졸학회 2023 Particle and Aerosol Research Vol.19 No.4
APS (Aerodynamic Particle Sizer) and OPC (Optical Particle Counter) have been widely used to real-time measurement of indoor and outdoor aerosols. The APS measures the size distribution based on an aerodynamic diameter, while the OPC uses optical diameter to measure the size distribution of aerosols. Since obtaining a size distribution based on aerodynamic diameter is important to understand aerosol characteristics, lots of researcher had been developed experimental equations which can convert optical diameter into aerodynamic diameter. However, previous studies have conducted repeated experiments on particles having a single diameter. In this study, an experimental method of converting optical diameter into aerodynamic diameter through a single experiment was presented. The collection efficiencies of an axial cyclone were measured using APS and OPC at the same time, and the correlation equation between aerodynamic diameter and optical diameter was driven through a theoretical model. Using the proposed method, the size distribution of NaCl particles measured by OPC showed a high correlation with the size distribution obtained by APS (0.93 of R-squared value). In the tests conducted on ISO A1, A2, and A4 test particles, the converted OPC size distribution tended to be similar to the APS size distribution, and for each of test particles (ISO A1, A2, and A4), the R-squared values for the APS particle size distribution were 0.75, 0.86, and 0.89, respectively.