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김원일 ( Kim Won Il ),정구복 ( Jeong Gu Bog ),이종식 ( Lee Jong Sig ),김진호 ( Kim Jin Ho ),신중두 ( Sin Jung Du ),윤순강 ( Yun Sun Gang ) 한국환경농학회 2003 한국환경농학회지 Vol.22 No.3
Heavy metal contents in commercial horticultural growing media were investigated. Fifty-three samples were collected nationwide during 2000 to 2001 and heavy metals in the samples were analyzed by ICP-OES after acid digestion and 0.1 N HCl extraction. Average contents of total Cd, Cr, Cu, Ni, Pb, and Zn by acid digestion in the growing media were 0.69, 35.7, 14.9, 15.5, 12.7, and 54.8 ㎎/㎏ DW, respectively. The ranges of heavy metal in the growing media were 0-1.82, 0-259.8, 1.6-69.5, 0-60.7, 0-36.5, 12.9-124.0 ㎎/㎏ DW for Cd, Cr, Cu, Ni, Pb, and Zn, respectively. Heavy metal contents in the commercial horticultural growing media were showed lower levels than the permitted levels for quality control described by Korean Standard Analytical Method for Crowing Media. Average contents and ranges of 0.1 N HCl extractable heavy metals were 0.08 and 0-0.20 for Cd, 0.38 and 0-2.10 for Cr, 1.45 and 0-4.03 for Cu, 0.85 and 0-3.31 for Ni, 0.84 and 0-2.21 for Pb, and 30.68 and 0.18-88.45 ㎎/㎏ DW for Zn, respectively. These concentrations by 0.1 N HCl extraction showed much less levels than those of total heavy metals by acid digestion.
펄스전류활성 소결에 의한 나노구조 TiN-AlN 복합재료 제조 및 기계적 특성
김원백 ( Won Baek Kim ),서창열 ( Chang Yul Suh ),노기민 ( Ki Min Roh ),임재원 ( Jae Won Lim ),심현보 ( Hyun Bo Shim ),박현국 ( Hyun Kuk Park ),손인진 ( In Jin Shon ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.11
A dense nanostructured TiN-AlN composite was prepared from high-energy ball milled TiN-AlN mixture powders by pulsed current activated sintering (PCAS). A highly dense TiN-AlN bulk composite was obtained within 2 minutes at 1500℃ with the simultaneous application of 80 MPa pressure and pulsed current. The fine crystalline structure of the TiN-AlN mixture, which was obtained by high-energy milling, was effectively maintained during PCAS and resulted in the enhancement of the mechanical properties. The micro hardness and fracture toughness of TiN-AlN composite were 1780 kg/mm2 and 5 MPa.m1/2, respectively. The mechanical properties were higher than monolithic AlN or TiN.
기계적 합성된 분말로부터 펄스전류활성 소결에 의한 나노구조 1.5TiAl-Al2O3 복합재료 제조 및 기계적 특성
김원백 ( Won Baek Kim ),왕희지 ( Hee Ji Wang ),노기민 ( Ki Min Roh ),조성욱 ( Sung Wook Cho ),임재원 ( Jae Won Lim ),손인진 ( In Jin Shon ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.4
Nano-powders of 1.5TiAl and Al2O3 were synthesized from 1.5TiO2 and 3Al powders by high energy ball milling. Nanocrystalline Al2O3 reinforced composite was consolidated by pulsed current activated sintering within 2 minutes from mechanochemically synthesized powders of Al2O3 and 1.5TiAl. The relative density of the composite was 99.5%. The average hardness and fracture toughness values obtained were 1250 kg/mm2 and 10 MPa·m1/2, respectively.
김원일(Won-Il Kim),김종진(Jong-Jin Kim),류지혁(Ji-Hyock Yoo),김지영(Ji-Young Kim),이지호(Ji-Ho Lee),백민경(Min-Kyoung Paik),김록영(Rog-Young Kim),임건재(Geon-Jae Im) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.6
To assess the bioavailability of As in soils and to provide a basic information for adequate management of As contaminated fields, paddy soils and rice grains near 5 closed mines were collected and analyzed for As using sequential extraction procedure. The As contents extracted with 1M HCl against total As content in soils were ranged from 5.4 to 41.9% (r=0.90<SUP>**</SUP>). However, these two contents of As in soils were not positively correlated with As concentration in rice grains. Major As fractionation of paddy soils was residual form ranging 38.1 to 84.1% except NS mine. Also, specially adsorbed fraction and fraction associated with amorphous Fe and Al oxyhydroxides, which are partially bioavailable As fractionation to the rice plant, were positively correlated with As in rice grains while fraction associated with crystalline Fe and Al oxyhydroxides and residual form were not correlated.
Won-Il Kim(김원일),Jin-Kyoung Kim(김진경),Ji-Hyock Yoo(류지혁),Min-Kyoung Paik(백민경),Sang-Won Park(박상원),Oh-Kyung Kwon(권오경),Moo-Ki Hong(홍무기),Jay-E Yang(양재의),Jeong-Gyu Kim(김정규) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.1
휴폐광산 인근 주민에 대한 위해영향을 평가하는데 있어서 벼 품종에 따른 변이를 파악하기 위하여 농경지 토양 및 쌀의 비소, 카드뮴, 구리 및 납의 함량을 분석하였다. 중금속 오염농경지에서 조사된 잠재적인 인체노출경로로서 오염된 농경지 및 쌀을 통한 경구섭취 및 피부접촉을 통한 품종간 일일평균 인체노출량(ADD)을 산정하였다. 비발암성 위해도 평가로 노출경로별 중금속의 위험비율인 HQ 지수와 모든 노출경로를 총합한 중금속의 위험지수인 HI 값을 US-EPA D/B를 활용하였다. 벼 품종간 HI 지수는 23.6∼34.3으로 전품종에서 높은 잠재적 위해성으로 평가되었는데 DA 품종이 가장 낮은 반면 TB 품종이 가장 높은 HI 값을 보였다. 쌀 소비에따른 비소의 발암성 위해도 평가는 품종간 2.0E-03∼3.5E-03을 보여 미국 EPA에서 정한 위해성 기준인 만명중 한명 이상으로 높게 나타났다. 발암성 위해도에 대한 품종간 비교에서 DA 품종이 가장 낮은 반면 TB 품종이 가장 높은 HI 값을 보였다. 이러한 결과는 위해성 평가가 중금속 오염에 안전한 품종을 선발하는데 유용한 도구로서 활용할 수 있음을 보여준다. Heavy metal pollution may be one of the most serious challenges confront crop production and human health. Therefore, the selection of heavy metal tolerance cultivars which adapted to the contaminated fields will introduced a suitable solution for management this critical environmental risk. The objectives of this research is to assess human health risk using geochemical analyses and exposure assessment of heavy metals in rice cultivars. Risk for inhabitants in the closed mine area was comparatively assessed for As, Cd, Cu and Pb in 10 rice varieties as a major exposure pathway. The average daily dose (ADD) of each heavy metal was estimated by analyzing the exposure pathways to rice and soil. For the non-carcinogenic risk characterization, Hazard Quotient (HQ) and Hazard Index (HI) were calculated using toxicity indices provided by US-EPA IRIS. The different rice varieties revealed a wide range of HI values from 23.6 to 34.3, indicating that all rice varieties have a high potential toxic risk. The DA rice variety showed the lowest HI value while the TB rice variety the highest. The probabilities of cancer risk for As via rice consumption were varied with rice varieties ranging from 2.0E-03 to 3.5E-03 which exceeded the regulatory acceptable risk of 1 in 10,000 set by US-EPA. The DA rice variety also showed the lowest value while the TB rice variety gave the highest value. Our results indicate that risk assessment can be contribute to screen the pollution safe rice cultivars in paddy fields affected by the mining activity.