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Biosorption in the Mixed Heavy Metal Solution by Biosorbents of Marine Brown Algae
감상규,이동환,이회근,이민규 ( Sang Kyu Kam,Dong Hwan Lee,Whae Geon Lee,Min Gyu Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3
N/A The biomass of nonliving, dried marine brown algae U. pinnatifida, H. fusiforme, and S. fulvelum harvested in the sea near Cheju, were studied for their sorption performance and selectivity of copper, zinc, lead, and chromium. The metal uptakes by biosorbent materials increased with increasing pH in the range of Ci 10-500㎎/L. The metal uptakes by biosorbent materials decreased in the following sequence: Pb>Cr>Cu>Zn. Among the biosorbent materials the decreasing order was as follows: U. pinnatifida≥H. fusiforme>S. fulvelum for copper and zinc; U. pinnatifida>H. fusiforme>S fulvelum for lead and chromium. The metal uptakes(except for lead) by biosorbent materials in the mixed solution, decreased greatly in comparison to those in the single solution.
Study on the Charge Determination of Synthetic Cationic Polymers
감상규,김정호,이민규 ( Sang Kyu Kam,Jung Ho Kim,Min Gyu Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3
N/A Visual titrimetry, spectrophotometry, and streaming current detector(SCD) method for end point detection are described for the charge determination of the synthetic cationic polymers of different charge density and molecular weight. The charge densities for each of the cationic polymers by spectrophotometry and SCD method were in good agreement with each other. The results obtained by visual titrimetry are less reliable, compared to other methods, especially for polymers low charge density. With spectrophotometry and SCD method, the titration curves have a sharp break point in the range of the end point reaction for polymers of high charge density, which becomes rather less sharp for polymers of lower charge density. The charge densities for polymer A-L, which are copolymers of polyacrylamide and dimethylaminoethyl acrylate, show pH dependence, becoming lower as pH increases, but the charge density of polydiallyldimethylammonium chloride are independent of pH in the pH range investigated.
제주도 지하수 질산염 농도의 시·공간적 변화 특성: 장기(1993-2015) 모니터링 자료의 평가
김호림(Ho-Rim Kim),오준섭(Junseop Oh),도현권(Hyun-Kwon Do),이경진(Kyung-Jin Lee),현익현(Ik-Hyun Hyun),오상실(Sang-Sil Oh),감상규(Sang-Kyu Kam),윤성택(Seong-Taek Yun) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1
1993년부터 2015년까지 관측된 제주도 지하수 장기모니터링 관측정(N = 4,835)에서 수집된 지하수 수질자료(N = 21,568)를 기반으로 질산성질소의 시공간적 변동 특성을 평가하였다. 제주도 지하수의 질산성질소 농도의 중앙값은 2.5 mg/L로서 다른 국가나 대륙의 조사 결과에 비해 다소 높거나 유사한 것으로 나타났다. 또한 지하수 용도, 행정구역 및 고도 별로 유의한 차이를 보였다. 특히, 산간 지역에 비해 저지대 해안가에 위치한 농업 및 주거지역에서 농도가 높음을 확인하였다. Mann-Kendall 및 Sen’s slope 분석을 활용한 질산성질소 농도의 추세 분석 결과, 하류 저지 대에 비해 중산간지역에서의 질산성질소 농도 증가 경향이 뚜렷하였다. 제주도 내 토지 피복의 시계열 변화 특성과 결부 지어 보면, 중산간지역의 오염 증가 추세는 농업지역의 확장 등 인위적 활동 증가에 기인한 결과로 판단된다. 반면,기지정된 지하수자원특별관리구역에서는 전반적으로 질산성질소 농도의 감소 경향이 나타났는데, 이는 지하수 관리 측면에서 수질관리를 위한 적극적인 정책이 유효함을 시사한다. 본 연구에서는 제주도 지하수의 질산성질소 오염관리를 위한 적정 방안을 제안한다. The spatio-temporal variations of nitrate concentrations in groundwater of Jeju Island were evaluated by an analysis of time series groundwater quality data (N = 21,568) that were collected from regional groundwater monitoring (number of wells = 4,835) for up to 20 years between 1993 and 2015. The median concentration of NO 3 -N is 2.5 mg/L, which is slightly higher than those reported from regional surveys in other countries. Nitrate concentrations of groundwater in wells tend to significantly vary according to different water usage (of the well), administrative districts, and topographic elevations: nitrate level is higher in low-lying agricultural and residential areas than those in high mountainous areas. The Mann-Kendall trend test and Sen’s slope analysis show that nitrate concentration in mid-mountainous areas tends to increase, possibly due to the expansion of agricultural areas toward highland. On the other hand, nitrate concentrations in the Specially Designated Groundwater Quality Protection Zones show the temporally decreasing trend, which implies the efficiency of groundwater management actions in Jeju. Proper measures for sustainable groundwater quality management are suggested in this study.
Dioxane을 용매로 한 PVC-LMO 비드의 제조와 Li+ 흡착특성
감상규 ( Sang Kyu Kam ),유해나 ( Hae Na You ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.7
In this study, PVC-LMO beads were prepared by immobilizing lithium manganese oxide (LMO) with poly vinyl chloride (PVC) diluted in dioxane solvent. XRD and SEM analysis confirmed that LMO was immobilized well in PVC-LMO beads. The diameter of PVC-LMO beads prepared by dioxane solvent was about 2 mm. The adsorption experiments of lithium ions by PVC-LMO beads were conducted batchwise. The optimum pH was pH 10. The adsorption characteristics of lithium ions by PVC-LMO beads was well described by the pseudo-second-order kinetic model. The maximum adsorption capacity obtained from Langmuir model was 24.25 mg/g. The thermodynamic parameters such as △H°, △S° and △G° were evaluated. The calculated ΔG° was between .6.16 and .4.14 kJ/mol (below zero), indicating the spontaneous nature of Li+ adsorption on PVC-LMO beads. Also, the results showed that PVC-LMO beads prepared in this study could be used for the removal of lithium ions from seawater containing coexisting ions such as Na+, K+, Mg2+ and Ca2+.
PVA-D2EHPA/TOPO 비드의 제조와 수중의 구리 이온 제거 특성
감상규 ( Sang Kyu Kam ),박정민 ( Jeong Min Park ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9
PVA-D2EHPA/TOPO beads containing two extractants, di-(2-ethylhexyl) phosphoric acid (D2EHPA) and trioctylphoshine oxide (TOPO) were prepared for the removal of copper ions from aqueous solution. The prepared PVA-D2EHPA/TOPO beads were characterized by SEM and FT-IR. The removal characteristics of copper ions by PVA-D2EHPA/TOPO beads was investigated using batch and continuous systems. In batch experiments, the maximum removal capacity calculated from Langmuir isotherm model was 18.6 mg/g and the optimal pH was in the range of 4.5 ∼6. The continuous experiments showed that the removal capacity of copper ions increased with increasing inlet copper ion concentrations and bed heights, but decreased with increasing inlet flow rates.
제주도 제주항내 퇴적물 중의 유기주석화합물의 분포 특성
감상규 ( Sang Kyu Kam ),김현정 ( Hyun Jeong Kim ),이민규 ( Min Gyu Lee ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.3
Organotin compounds (OTs), namely butyltins compounds (BTs) and phenyltin compounds (PhTs), were measured in surface and core sediments collected in Jeju harbor. The horizontal and vertical distribution was examined and the relationship between the concentration of OTs and organic matter content and particle size distribution was also studied. BTs were detected in significant concentrations in sediments inside Jeju harbor. PhTs were detected in very low concentrations, compared to BTs. The main species in BTs and PhTs were dibutyltin (DBT) and monobutyltin (MBT), monophenyltin (MPhT), respectively. In the relationships between the concentrations of total BTs and organic carbon content, the significant correlations (r2=0.4898 in surface sediments, r2=0.53 in one core sediments) and no correlation in another core sediments obtained, which is estimated that the distribution of BTs in sediments were affected by several factors, such as their physicochemical properties including organic carbon content, and a tide, etc. In the relationships between the concentrations of total BTs and particle size (mud, sand, and gravel) in sediments, the concentrations of total BTs were higher in the sediments with higher mud content, indicating that higher BTs were distributed with increasing sediments of fine granules.
감상규 ( Sang Kyu Kam ),허철구 ( Chul Goo Hu ),이민규 ( Min Gyu Lee ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.5
Contamination of butyltin compounds (BTs), namely tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT), was evaluated in sediments collected inside Jeju Harbor in 2001. The concentrations of BTs in surface sediments were comparable to those in other sites of domestic and foreign countries. The high correlations between BTs in surface (r2=0.83~0.91) and core (r2=0.70~0.79) sediments and the significant correlations between BTs concentrations and the number of incoming and outgoing vessels indicated that DBT and MBT were mainly degraded from TBT based on antifouling paints of vessels etc. and other sources, such as DBT and MBT, could be ignored. The butyltin degradation indices ([DBT]+[MBT]/[TBT]) in surface sediments were in the range of 2.2~3.6 (mean 2.7), indicating that the parent compound, TBT, was inflowed into the surface sediments a long ago, degraded and deposited. The sedimentation age of BTs contaminated core sediments could not estimated because the content of (210)Pb activity was nearly all the same and so the sedimentation rate could not obtained.
제주 스코리아로부터 합성된 Na-P1 제올라이트에 의한 2가 중금속 이온의 제거특성
감상규 ( Sang Kyu Kam ),현성수 ( Sung Su Hyun ),이민규 ( Min Gyu Lee ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.10
The removal performances of divalent heavy metal ions (Pb2+, Cu2+, Cd2+, Sr2+ and Mn2+) were studied using the Na-P1 zeolite synthesized from Jeju scoria in the batch and continuous fixed column reactor. The uptakes of heavy metal ions by synthetic Na-P1 zeolite decreased in the order of Pb2+>Cu2+>Cd2+>Sr2+>Mn2+ based on the selectivity of each ion to ionic exchange site of Na-P1 zeolite for single and mixed solutions in batch or continuous fixed column reactor. For mixed solution, each heavy metal ion uptake was lower than that in single solution, and especially the uptake for Mn2+ decreased greatly. In batch reactor, the uptakes of heavy metal ions by synthetic Na-P1 zeolite were described by Freundlich or Langmuir equation, but they followed the former better than the latter. In continuous fixed column reactor, the maximum ion exchange capacity obtained for each of heavy metal ions, was about 90% of that in batch reactor. The uptakes of heavy metal ions by synthetic Na-P1 zeolite increased with the increase of initial heavy metal concentration and solution pH, and the decrease of the amount and particle size of synthetic zeolite.