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      저자 : 최윤나(Yun-Na Choi) (검색결과 2 건)
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      • 서울ㆍ아산지역 호흡성먼지의 금속함량에 관한 연구

        최윤나(Yun-Na Choi),전용택(Yong-Taek Jeon),장봉기(Bong-Ki Jang),양원호(Won-Ho Yang),염윤기(Yoon-Ki Yom),손부순(Bu-Soon Son) 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.1

        The purpose of this study was to characterize background mass concentration of PM₁?, PM2.5 and metallic composition from June 2004 to June 2005 in comparison with Seoul and Asan city. The results were as follows: 1. Annual mean of PM₁₂ concentrations in Seoul and Asan were 56.95(±25.63)㎍/㎥, 57.02(±27.22)㎍/㎥ respectly. 2. Annual mean of PM2.5 concentrations in Seoul and Asan were 46.97(±40.36)㎍/㎥, 42.16(±21.79)㎍/㎥ respectly. 3. The average PM2.5/PM₁? ratio was 0.82 in Seoul and 0.74 in Asan city. 4. The concentration of PM₁?, PM2.5 were the highest in spring and the lowest in summer. Asan was higher than Seoul in spring and summer. 5. The results showed that average PM₁? composition order as Si>Fe>Pb>Zn>]Mn in Seoul and Si>Fe>Zn>Pb>Mn in Asan. The concentration of metals in PM₁? of Seoul that Cr, Cu, Fe, Mn were high in spring and Zn was low in Fall. Fe, Mn were high in spring of Asan. 6. The results showed that average PM2.5 composition order as Si>Pb>Fe>Zn>Mn in Seoul and Si>Fe>Pb>Zn>Cr in Asan. The concentration of metals in PM2.5 of Seoul that Cr was high in spring. 7. The result showed that relation between Cr and Cu, Cu and Fe, Fe and Mn, Mn and Zn, Zn and Si in Seoul, Cr and Zn, Cu and Pb, Zn and Pb, Pb and Mn in Asan. The result showed that PM₁? concentration exceeding 50㎍/㎥(US-EPA Standard) and PM2.5 concentration exceeding 15㎍/㎥(US-EPA Standard). In urban area, the monitoring of PM2.5 permits the anthropogenic sources and the interference of natural sources with respect to PM₁? measurements.

      • 건설 사업장의 작업 공정별 분진 발생량 평가

        장봉기,이종화,박종안,최윤나,이익진 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2

        Airborne dust emission among construction industry place of work that locate on Pyeongtaek, Gyeonggi province of 4 processes (a plaster, cutting, hammer drill, concrete grinding) were analyzed. Work did in state that a worker does not exist except measurer as well as is not attained to control group. Investigation period did for 2 months from October to November. It measured 15 times by each process by personal air sampling method that is direct-reading particulate matter measurement device(digital dust indicator). When a plaster work, the dust was class 3 particulate matter, and geometric mean is 2.14㎎/m³, and occasion that exceed 10㎎/m³ that is threshold limit value was 13.3%. Control group was 0.35㎎/m³. plaster work was statisically difference higher than the control group (p<0.001). It was not significant difference between fixed type cutting machine work (0.96㎎/m³) and control group. It were not exceeded for threshold limit value. Geometric mean was 10.44㎎/m³ at movable type cutting machine process. Threshold limit value of this process was exceeded 53% and concentration of total dust was significantly higher than control group (p<0.001). Geometric mean was 3.22㎎/m³ at diameter 13.45㎜ drill work among hammer drill work and all cases not exceeded for threshold limit value, but it was significantly higher than control group(p<0.001). When work diameter 6.5㎜ drill, geometric mean was 4.06㎎/m³ and exceeded for threshold limit value was 13.3%, it was significantly higher than that of control group (p<0.001). It showed higher concentration of dust by diameter is smaller drilling. All 15cases exceeded threshold limit value at concrete grinding work, geometric mean was 78.38㎎/m³, and it was significantly higher than that of control group (p<0.001). As a result of above, countermeasure preparation that concentration of total dust by each process in construction workplace was specially required because exceeded threshold limit value of working environment more than 50% at process of concrete grinding work and movable type cutting machine.

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