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공기 중 석면농도 분석시 관상어용 기포발생기를 개조한 장치와 기존의 상업용 시료 채취기와의 성능 비교
장봉기 ( Bong Ki Jang ),탁현욱 ( Hyun Wook Tak ),송수진 ( Su Jin Song ),조봉현 ( Bong Hyun Jo ),김영지 ( Yeong Ji Kim ),손부순 ( Bu Soon Son ),이종화 ( Jong Wha Lee ) 한국산업보건학회 2014 한국산업보건학회지 Vol.24 No.4
Objectives: The purpose of this study is to estimate the applicability of regional sample collection of environmental samples. Theconcentration of asbestos fibers were analyzed with two devices. One was an existing commercial air sampling pump that has been proved to be accurate and exact, and the other is a remodeled pump for sample collection which was made from an electric bubble generator originally designed for aquarium fish. Samples were collected with the two devices under the same environmental conditions and collection equipment. A comparative analysis of the concentration of ambient asbestos fiber was then performed. Methods: Based on previous research, six farmhouses with asbestos fiber slate roofs known to have high concentrations of asbestos fiber were selected. Using the existing commercial air sampling pump and the remodeled electric bubble generator, four to seven samples were collected each day one meter downwind from the edge of the slate roof at high volume (about 4 L/min) and low volume (about 1.4 L/min). The analyzer responsible for sample quality control of asbestos fibers counted the number of asbestos fibers with a phase microscope. Results: The rates of flow change of the existed sampler and the remodeled pump at high volume were 0.82% and 0.17%, respectively. The rates of flow change at low volume were 3.83% and 1.09%, but there was not significant difference. The rates of flow change are within the error range (±5%) of OSHA analyzing methods. For the high volume sampler, the average asbestos fiber concentration in the air collected by the existed sampler is 6.270 fibers/L and for the remodeled one 5.527 fibers/L, not a significant difference. For the low volume sampler, the average asbestos fiber concentration in the air collected by the existed sampler is 7.755 fibers/L and for the remodeled one 7.706 fibers/L, not a significant difference. The total area of the slate roof of the targeted farmhouse has an effect on the concentration of asbestos fibers in the air from the existing pump and the remodeled one (p<0.01). Conclusions: The sampling function between the existing commercial pump and the remodeled one shows little difference. Therefore, the remodeled pump is considered a pump with a good availability for collecting ambient air asbestos samples.
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장봉기,안다예,이슬기,탁현욱,송수진,조봉현,김영지,이종화 순천향대학교 기초과학연구소 2013 순천향자연과학연구 논문집 Vol.19 No.2
The purpose of this study is to analyze concentration and influence factors of asbestos fibers in the icicle of 19 farmhouses with asbestos cement slate roofing. The mean of concentration of asbestos fibers in the icicle of farmhouses with slate roofing was 1,057.9 fiber/mL. A factors which gave a influence to the asbestos fiber concentration in the icicle by construction year, roof length and total area of slate roofing were not significantly differences. But the number of asbestos fibers contained in icicle showed higher tendency as the year of slate roofing installation at the target farmhouses receded.
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장봉기,조우찬,박주원,탁현욱,송수진,엄택용,김영수,이종화 순천향대학교 기초과학연구소 2013 순천향자연과학연구 논문집 Vol.19 No.2
The purposes of this study was found out change of mineral concentration from the raw of drinking water to purified water and how much mineral is removed during purifying water. We analyze mineral (Na, K, Mg, Ca) concentration of total 12 sample waters (1 from raw water, 2 from purifiers each from 4 buildings of S university in Asan city, Chungnam, Korea). Mineral concentration is greatly declined from raw water to purified water. Removal efficiency of mineral concentration is Ca is 95.9% (the highest), Mg is 88.1%, K is 82.0%, Na is 66.5% which is the lowest. According to purifiers 1 brand, C brand purifier shows higher removal efficiency of Mg and Ca, on the contrary to this, N brand purifier shows higher removal efficiency of Na and K. The amount of mineral concentration from purified water is less than 1% of recommended daily allowance (RDA). Also, the amount of mineral concentration from raw water is very small (0.45〜8.96%). The results of this study showed that purified water which mineral is removed cannot be called as healthy water, and the mineral supplement quantity from water is well below RDA. On the other side, in function of remove contaminant purifiers have a very good ability to purify water.
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슬레이트 지붕의 설치년도와 면적에 따른 공기 및 유출 빗물 중의 석면 농도
장봉기 ( Bong Ki Jang ),류제영 ( Je Young Ryu ),탁현욱 ( Hyun Wook Tak ),송수진 ( Su Jin Song ),이종화 ( Jong Wha Lee ),이강호 ( Gang Ho Lee ),최재호 ( Jae Ho Choi ) 한국산업위생학회 2013 한국산업보건학회지 Vol.23 No.3
Objectives: The purpose of this study is to analyze the number and influence factors of asbestos fibers in the air of farmhouses with asbestos cement slate roofing, as well as in rainwater per unit area of the asbestos cement slate roofing. Methods: At a distance of 1 m from the end of asbestos cement slate roofing in 20 farmhouses, the asbestos fiber in the air was collected three times on a clear day downwind from the prevailing wind. Rainwater falling from the slate roofing was collected four times with a 1.05-m rainwater pipe on a rainy day at the 20 farmhouses, filtered with a MCE filter, and analyzed with a phase contrast microscope. Results: The geometric mean of the number of asbestos fibers in the air of farmhouses with slate roofing was 0.11 fiber/L, and no samples exceeded the recommended standard of 10 fiber/L. As a result of multiple regression analysis, a factor which gave a significant influence to the asbestos fiber content in the air was the gross area of slate roofing at the target farmhouses. The number of asbestos fibers included in rainwater collected per 1 m 2 of slate roofing was 1,753 fiber/L·m 2 . As a result of multiple regression analysis, the number of asbestos fibers contained in rainwater per 1 m 2 of slate showed a significantly higher tendency as the year of slate roofing installation at the target farmhouses receded. Conclusions: It was confirmed for the first time in Korea that asbestos from asbestos cement slate roofing scatters into the air.
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