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RISS 인기검색어
- 검색키워드
- 저자 : Sang-Mo Lee(이상모) (검색결과 44 건)
- 무료
- 기관 내 무료
- 유료
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Transport Characteristics of Cd, Cu and Zn in a Sewage Sludge-Treated Calcareous Soil
이상모,조재무,Lee, Sang-Mo,Cho, Chai-Moo 한국토양비료학회 1999 한국토양비료학회지 Vol.32 No.4
하수오니 처리 석회질 토양에서의 Cd, Cu 및 Zn의 수송 특성을 조사하기 위하여 하수오니 무처리 토양, 하수오니 50과 100 ton $ha^{-1}$ 처리 토양 및 하수 오니를 대상으로 용출현상 (elution development)과 혼성치환 (miscible displacement) 기술을 이용하여 실험을 수행하였다. 하수오니 50과 100 ton $ha^{-1}$처리 토양의 Cd, Cu 및 Zn 의 용출곡선 (elution curve)과 출현곡선 (breakthrough curve)은 하수오니 무처리 토양의 Cd, Cu 및 Zn의 용출곡선 및 출현곡선과 거의 비슷하였다. Cd, Cu, 및 Zn 10 mg을 처리한 Cd, Cu 및 Zn의 용출곡선은 Cd, Cu 및 Zn을 처리하지 않았을 때의 용출곡선과는 거의 비슷하였으나, Cd, Cu 및 Zn의 50 mg을 처리한 용출곡선과는 크게 달랐다. Cd, Cu 및 Zn 혼합용액 500과 $1000mg\;L^{-1}$을 이용한 Cd, Cu 및 Zn의 출현곡선은 서로 비슷하였으나, Cd, Cu 및 Zn 혼합용액 $100mg\;L^{-1}$을 이용한 출현곡선과는 크게 달랐다. 실험에 사용한 석회질 토양에서 하수오니 50과 100 ton $ha^{-1}$ 처리량은 Cd, Cu 및 Zn의 수송특성에 큰 영향을 주지 못하였으며, Cd와 Zn의 수송특성은 서로 비슷하였으나 Cu의 수송특성은 Cd 과 Zn의 수송 특성과는 크게 달랐다. A controlled column study using elution development and miscible displacement was conducted to assess heavy metal transport characteristics in sludge-untreated soil ("Control"), soil treated with an equivalent of sludge 50 and 100 dry ton $ha^{-1}$ ("Soil-Sludge mixtures"), and sewage sludge ("Sludge"). The elution curves (ECs) and the breakthrough curves (BTCs) for Cd, Cu and Zn in sludge 50 and 100 dry ton $ha^{-1}$ treated soils are not different from the sludge-untreated soil, The ECs for Cd, Cu and Zn in soil column which received a pulse of 10 mg of each Cd, Cu and Zn were similar to those of Cd, Cu and Zn in soil column which had no Cd, Cu and Zn added, but were very different with the ECs for Cd, Cu and Zn in soil column which received a pulse of Cd, Cu and Zn containing 50 mg of each metal. On the other hand, the BTCs for Cd, Cu and Zn in soil columns that were eluted with 500 and $1000mg\;L^{-1}$ of mixed solution of Cd, Cu and Zn were similar to each other, but were distinctly different with the BTCs for Cd, Cu and Zn in soil column that was eluted with $100mg\;L^{-1}$ mixed solution of Cd, Cu and Zn. Sewage sludge applied at rates of 50 and 100 dry ton $ha^{-1}$ did not affect the transport characteristics of this calcareous soil. The apparent mobility for this sludge treated soil and sludge is: Cd >Zn>Cu. The transport characteristics of Cd and Zn are similar to each other, but are different from those of Cu.
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Kinetic Study of Cadmium Adsorption by Sewage Sludge
이상모,티분고,Lee, Sang-Mo,Goh, Tee-Boon 한국토양비료학회 2000 한국토양비료학회지 Vol.33 No.1
하수 오니에 의한 Cd 의 흡착반응을 조사하기 위하여, Cd의 처리농도 (5, 10, 15, 20, 25 및 $50{\mu}g\;Cd\;ml^{-1}$를 달리하여 흡착실험을 수행하였으며, 반응시간 (흡착 반응 후 0.5, 1.0, 1.5, 2.5, 4.5, 6.6, 8.5, 12.5, 24.5 및 48.5 h) 별로 Cd 의 농도를 구하여 흡착반응의 속도상수를 계산하였다. 모든 처리 농도에서 처음 반응시간 30분 이내에 처리 한 Cd의 약 95% 가 흡착되었다. 초기의 빠른 1단계 Cd 흡착반응 후에는 1차 가역 반응식으로 기술할 수 있는 1단계 반응보다는 느린 2단계의 Cd 흡착 반응이 일어났다. 1차 가역 반응식으로 기술할 수 있는 2단계의 Cd 흡착 반응의 속도상수는 $-0.137{\sim}-0.521h^{-1}$의 범위로서 Cd처리 농도가 증가할수록 속도상수는 감소하였다. 흡착 반응에서 평형에 도달하는 시간 (약 6-24 h) 이나, 평형에서의 Cd 의 흡착량 (약 $276-2720{\mu}g\;g^{-1}$) 또는 흡착되지 않고 용액에 남아있는 Cd의 농도 (약 $60-400{\mu}g\;L^{-1}$) 도 Cd 의 처리 농도에 의하여 결정되었다. 즉 Cd 의 처리 농도가 증가할수록 평형에 도달하는 시간, 흡착량 및 평형 농도는 증가하였다. 하수 오니에 의하여 흡착된 Cd 의 일부는 시간이 경과함에 따라 하수 오니로 부터 방출되었으나 그 양은 전체 Cd 흡착량에 비하면 매우 적었다. To investigate the adsorption-desorption reaction of Cd by sewage sludge, the adsorption of Cd from $Cd(NO_3)_2$ solutions of concentrations ranging from 5 to $50{\mu}g\;Cd\;mL^{-1}$ by sewage sludge was examined for reaction periods up to 48 hours. The amount of Cd adsorbed as a function of time was measured. The adsorption between Cd in solution and the solid phase could be described by two stages. The initial adsorption of Cd was very rapid, that is, approximately 95% of the added Cd was removed from solution within the first 30 minutes. Further, the greater the concentration of Cd added, the greater was the amount of Cd adsorbed. After the rapid initial decrease of Cd, a slower decline in the Cd concentration resulted which followed first order reversible kinetics. The equilibrium concentrations for the reactions, as well as the time period for the equilibrium reactions were dependent on the initial Cd concentrations. If equilibrium is reached, the amount of Cd remaining in solution is greater when the amount adsorbed is higher, although the percentage of Cd in solution is constant relative to the initial concentration of Cd. Some of the adsorbed Cd was released back to solution since the concentration of Cd after 48 hours was higher than the equilibrium concentration of Cd. However, despite the increased amount of Cd measured, the overall net reaction was a significant adsorption of Cd from solution by sewage sludge.
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중년기 남성들의 규칙적인 운동으로 인한 혈청지질의 변화
이상모(Sang Mo Lee),정연수(Youn Soo Jung) 한국사회체육학회 1997 한국사회체육학회지 Vol.7 No.-
The purpose of the study is to know the relation chronic exercise to the change of serum lipid, a factor of the disease of adult people. The subjects were 17 healthy men in their 50s and proceeded the exercise for 12 weeks at the 70% of their maximal heart rate. The training frequency was 5 times a week and exercise time was 30 minutes. Measured three times, before the training, after 6-week training, and after 12-week training and repeated measures ANOVA was used for statistical analysis. The results are 1. Triglyceride and total cholesterol are reduced significantly after 12-week training comparing with them before the training(p<.001) 2. High density lipoprotein and high density lipoprotein cholesterol are also reduced significantly after 6-week training, 12-week training respectively comparing with them before the training(p<.001). 3. Hemoglobin was reduced significantly after 6-week training, 12-week training respectively comparing with it before the training(p<.001). In conclusion, when the subjects continued doing exercise for 12 weeks at the intensity of 70% of their maximal heart rate, the serum lipid was changed reducing significantly. Accordingly, the training intensity and duration of this study will notice the sedentary weekers in their 50s the importance of chronic exercise.
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Sang-Sun Lim(임상선),Sang-Mo Lee(이상모),Seung-Heon Lee(이승헌),Woo-Jung Choi(최우정) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.4
화학비료, 가축분뇨 및 퇴비 등 주요 질소원의 질소동위원소비 (δ<SUP>15</SUP>N) 차이를 조사하기 위해 각각 8, 4, 37점의 시료를 채취하여 δ<SUP>15</SUP>N을 분석하였다. 평균 δ<SUP>15</SUP>N 값은 화학비료가 -1.5 ± 0.5‰ (범위: -3.9~+0.5‰‰), 가축분뇨가 +6.3 ± 0.4‰ (+5.3~+7.2‰), 가축분퇴비가 +16.0 ± 0.4‰ (+9.3~+20.9‰)였다. 화학비료가 타 질소원에 비해 δ<SUP>15</SUP>N 값이 낮은 것은 화학비료 제조시 이용하는 질소원인 대기 N₂의 δ<SUP>15</SUP>N 값 (0‰)을 반영하기 때문이다. 반면, 가축분에 비해 퇴비의 δ<SUP>15</SUP>N 값이 높은 것은 퇴비화 과정 중 일어나는 질소손실 (특히, 암모니아 휘산)과 관련된 질소동위원소분할효과 (<SUP>14</SUP>N의 손실속도><SUP>15</SUP>N의 손실속도)에 의한 퇴비 중 <SUP>15</SUP>N 농축에 의한 결과로 판단된다. 따라서, 본 연구는 δ<SUP>15</SUP>N 분석을 통해 현재 우리나라 농업 시스템에서 가장 널리 이용되고 있는 두 가지 질소원 (화학비료와 퇴비)을 구분할 수 있음을 보여준다. To investigate the difference in N isotope ratio (<SUP>15</SUP>N/<SUP>14</SUP>N, expressed as δ<SUP>15</SUP>N) among N sources (synthetic fertilizer, livestock manure, and manure compost), eight synthetic fertilizer, four livestock manure, and thirty-seven compost samples were collected and analyzed for δ<SUP>15</SUP>N. The mean δ<SUP>15</SUP>N values of N sources were -1.5 ± 0.5‰ (range: -3.9 to +0.5‰) for synthetic fertilizer, +6.3 ± 0.4‰ (+5.3 to +7.2‰) for manure, and +16.0 ± 0.4‰ (+9.3 to +20.9‰) for compost. The lower δ<SUP>15</SUP>N of synthetic fertilizer was attributed to its N source, atmospheric N2 of which δ<SUP>15</SUP>N is 0‰. Meanwhile, more <SUP>15</SUP>N-enrichment of compost than manure was assumed to be resulted from N isotopic fractionation (faster loss of <SUP>14</SUP>N-bearing compound than <SUP>15</SUP>N) associated with N loss particularly via NH3 volatilization during composting. Therefore, our study shows that δ15N values could successfully serve in discriminating two major N sources (synthetic fertilizer and compost) in agricultural system.
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