석면 슬레이트 지붕 가옥의 실내외 공기 중 석면 섬유 농도 및 건강 위해성 평가

허은협,장봉기,박형근,원진섭,류재완,정우철,이종화,손부순 한국냄새환경학회 2017 실내환경 및 냄새 학회지 Vol.16 No.1

In this study, we analyzed the factors affecting the concentration of airborne asbestos fiber in the indoor and outdoor environment of a slate roofing house, and performed a health risk assessment of residents living in houses with slate roofs. Sampling was conducted at ten houses with slate roofs on 3 different days under different weather conditions. A high flow rate pump was used for sampling. The specimen was assessed using a phase-contrast microscope. The degree of risk of exposure to asbestos was assessed using EPA’s carcinogen risk assessment method. Asbestos fiber concentrations for slate roofing houses were 2.43 fiber/L inside and 2.46 fiber/L outside, respectively. The correlation between the indoor and outdoor asbestos fiber concentration was 0.486. But on both sides, the asbestos fiber concentrations did not exceed the standard (10 fiber/L) for ambient air in Korea. The factors affecting the concentration of asbestos fiber were year of construction (p<0.05), total roof area (p<0.05) and average wind velocity (p<0.01). According to EPA’s ELCR (Excess Lifetime Cancer Risk) on air pollution substances, a level of 1.0E-04~1.0E-06 should be maintained. However, the ELCR level of 6 out of 10 houses was over 1.0E-04. Therefore, a risk management plan for residents of slate roofing houses must be prepared immediately.

국내 일부 산업단지의 VOCs, PM<SUB>10</SUB>, PM<SUB>2.5</SUB>의 농도분포

손부순,박명규,조지예,허은협,신준섭,장경벽,박희진,윤경옥,이종대 한국대기환경학회 2015 한국대기환경학회 학술대회논문집 Vol.2015 No.11

석면 슬레이트 지붕 가옥에서의 풍향에 따른 공기 중 섬유상 입자 농도 및 크기 분포

김영지,장봉기,조봉현,허은협,이종화,손부순 한국냄새환경학회 2017 실내환경 및 냄새 학회지 Vol.16 No.4

This study aims to analyze the effects of 4 directions of wind, wind speed, year of construction of slate roofs, installation area and other factors on the concentration and size distribution of airborne fiber particles in farmhouses with a slate roof containing asbestos. Airborne fiber particle samples were collected from the air in six houses with a slate roof containing asbestos using a high flow rate pump (10 L/min) for 2 hours, three times a day with a different condition, 72 times in total. The airborne fiber particle concentrations were measured using a phase contrast microscope, and the size of fiber particles of 72 samples in total was estimated using the mean value of those in each sample measured at 100 with a field of view. The total average concentration of fiber particles collected from in the air in four directions of the targeted farmhouses was 2.83 fiber/L, and its maximum concentration was 5.75 fiber/L, which means that among all samples there was no place that exceeded 10 fiber/L, a recommended indoor air quality standard. The average size of the fiber particles was 11.55 µm, and the maximum size was 40 µm. A multiple regression analysis of factors affecting the concentration and size of fiber particles in the air collected from the farmhouses with a slate roof containing asbestos found that the closer to the main wind direction (p<0.001) and the faster the average wind speed (p<0.05), the fiber particles concentration became significantly higher. In this case, the coefficient of determination was 52.8%. It was also found that the wider the total area of the slate roof (p<0.001) and the slower the average wind speed (p<0.05), the longer the fiber particles; the coefficient of determination for this finding was 19.6%. The concentration of fiber particles in the air of farmhouses with a slate roof appeared to be the highest under the main wind direction, and became significantly higher as the wind speed became faster. This proved that fiber particles were leaked from the slate roof. The size of the fiber particles became significantly longer as the area of the slate roof became wider and the wind speed became slower.

자동차 정비업소에서의 석면섬유 및 총분진 농도

장봉기,김인화,이상림,한진이,황수민,조봉현,김영지,허은협,이종화 순천향대학교 기초과학연구소 2015 순천향자연과학연구 논문집 Vol.21 No.1,2

We collected total 45 samples of asbestos fibers and total dust concentration by 2 personal sampling and 1 area sampling method from 5 auto repair shops in Asan city for 3 days. The results are as below. Asbestos fibers in the air of 30 samples from auto repair shops by mixed cellulose esters (MCE) filters were  ×   fiber/cc. It is very low, so it is not reach to the standard of permission of indoor air quality which is 0.01 fiber/cc. In 17 of 30 samples, asbestos was detected, but they are lower than quantitative limit. According to sampling media, total dust concentration collected by MCE filters (140.3㎍/㎥) is significantly higher than PVC filters (95.7㎍/㎥), but it is much lower than the occupational exposure limit which is 1st class of dust (2,000㎍/㎥), and there is no difference on number of repairing and number of exchange of brake lining. According to the result, the concentration of asbestos fibers and total dust in auto repair shops are much lower than standard of permission. They are lower than quantitative limit, so it is considered that there are no brake linings or brake pads which have asbestos have been repaired.

내리막 일반 도로변에서의 공기 중 석면섬유 및 총분진 농도

장봉기,김다운,김대준,안지희,이솔,조봉현,김영지,허은협,이종화 순천향대학교 기초과학연구소 2015 순천향자연과학연구 논문집 Vol.21 No.1,2

We analyzed 60 samples of asbestos fibers and total dust concentration in ambient air at the uphill and downhill of busy roadside in 5 areas in Asan city. Concentration of asbestos fibers in ambient air on downhill side (75.8×10⁻⁶ fiber/cc) was higher than one on uphill (37.3×10⁻⁶ fiber /cc), but, it was not statistically significance different. Both of them were even less than the standard of permission of indoor air quality which is 0.01 fiber/cc. Total dust concentration collected by mixed cellulose esters (MCE) filter (147㎍/㎥) was significantly higher than one collected by poly vinyl chloride (PVC) filter was 81㎍/㎥ (p<0.01). According to traffic, the more passing vehicles, the more total dust concentration. Diesel trucks influence on increasing total dust concentration (p<0.05). Regarding the result, vehicles which have brake linings and pads that contain asbestos fiber are considered that not be driven on the general road anymore. Increasing diesel trucks influence on increasing total dust concentration, and it is caused by respirable particulate in exhaust gas from diesel vehicles.

주유소로부터의 4방위 풍향에 따른 공기 중 휘발성 유기화합물 농도분포

박명규,이채혁,윤승배,김동주,엄택용,조봉현,김영지,허은협,이종대,이종화,손부순,장봉기 순천향대학교 기초과학연구소 2015 순천향자연과학연구 논문집 Vol.21 No.1,2

The concentration distribution of volatile organic compounds released when refueling in the gas station us relatively higher than the background concentration, so we can ascertain that at least a small amount of VOCs releases when pumping gas. Moreover, the mean concentration at the four cardinal points from the gas station was higher than the center of the gas station. Therefore, we can conclude that the VOCs are released not by the refueling but by the other factors, and the direction of the wind has bo influence on the concentration distribution.

석면함유 공공 건축물의 위해성 평가 및 면적 분포 특성

송수진 ( Su-jin Song ),장봉기 ( Bong-ki Jang ),조봉현 ( Bong-hyun Jo ),김영지 ( Yeong-ji Kim ),허은협,이종대 ( Joung-dae Lee ),손부순 ( Bu-soon Son ),이종화 ( Jong-wha Lee ) 한국산업보건학회 (구 한국산업위생학회) 2016 한국산업보건학회지 Vol.26 No.3

Objectives: This study, aims to examine the distribution characteristics of asbestos-containing building materials; risk assessment and area of distribution of asbestos-containing building materials depending on year of construction; building materials; types of building materials; and usage in public buildings in order to create fundamental data for safe management of public buildings. Methods: The asbestos investigation was conducted by an asbestos research institution from March to May 2014, targeting 41 public buildings which were subject to asbestos investigation in South Chungcheong-do Province. With respect to 381 presumed asbestos-containing materials, an investigation was conducted into whether they contained asbestos, asbestos type, content, year of construction, and use in the building were examined, and a risk assessment was performed. Results: Asbestos-containing building materials were used in 35 buildings(85.4%). Among them, 31(88.6%) were public buildings. Asbestos was detected in 73% of 381 suspected asbestos-containing materials, which were mostly ceiling materials (85.2%). The older the buildings, the more they showed a tendency to have a significantly higher risk assessment score. The ratio of average area with asbestos-containing building materials to total floor area was 57.6%, 44.1%, and 17.8% for buildings built in the 1980s, 1990s, and 2000s, respectively. This showed a tendency to be significantly higher with the age of the building. Conclusions: From the results above, it can be concluded that with the age of the buildings, the risk assessment score and the ratio of average area with asbestos-containing building materials to total floor area became significantly higher. Given the concern about the exposure to asbestos of residents and civil petitioners, safety management of older public buildings and measures for dismantling and removal of asbestos-containing building materials should therefore be urgently established.