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양이온 고분자전해질의 수중 입자의 응집에 미치는 교반강도 및 주입량의 영향
감상규,문창성,김대경,고병철,허철구 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-
Using several cationic polyelectrolytes of different charge density and molecular weight as flocculants and a simple continuous optical technique(photometric dispersion analyzer, PDA), the effects of mixing intensity and polyelectrolyte dosage on flocculation of kaoline particles(35 NTU) and particles(34.7 NTU) in Kangjung reversior of heavy rainfall have been examined. The optimum mixing was obtained at the stirring of 200rpm(G= 869 s^-1). The charge density of a polyelectrolyte is important in determining the optimum dosage and in the removl of particles. The optimum dosage is less for the polyelectrolyte of higher charge density and at the dosage, the removal of particles is higher for the polyelectrolyte of higher charge density and zeta potential of particles reaches to near zero. The optimum dosage for the removal of particles should be determined by flocculation test and not be determined by the turbidity of particles in water.
황토로부터 합성한 제올라이트에 의한 Cd(Ⅱ) 및 Cu(Ⅱ) 흡착특성
감상규,홍정연,허철구,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.7
Various kinds of zeolites, such as analcime (ANA), cancrinite (CAN), Na-P1 and sodalite octahydrate (SOD) could be synthesized from Hwangto by hydrothermal reaction in a high-pressure vessel. The adsorption characteristics of Cu(Ⅱ) and Cd(Ⅱ) by Hwangto and its synthetic zeolites were investigated using the chemical and electrochemical surface parameters of these adsorbents. The heavy metal adsorptivity among the adsorbents decreased in the following sequences: Na-P1 > SOD > ANA > CAN > Hwangto. This sequence was the same with the values of surface site density (Ns) of these adsorbents and was correlated inversely with the values of pHpzc (pH of the point of zero charge) and the values of Ka2(int) (intrinsic surface deprotonation constant) of the adsorbents for synthetic zeolites, i.e., the adsorbents with higher values of Ns and with lower values of pHpzc and Ka₂(int) for synthetic zeolites showed higher heavy metal adsorptivity. With increasing pH, the heavy metal adsorptivity increased greatly between pHpzc and pH 6 or 7 because of the steep increase of negatively charged sites for synthetic zeolites, but for Hwangto, it increased broadly because of slow increase of negatively charged sites based on its lower surface sites.
감상규,김현정,허철구,최영찬,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.7
Butyltin compounds (BTs), namely tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT), were measured in surface sediments collected in 2001 inside Hallim Harbor where a lot of shipping occurs as one of major harbors of Jeju Island, in order to evaluate their distribution. BTs were detected in surface sediments of all stations and their concentrations were comparable to those in surface sediments of other sites of domestic and foreign countries. The main species among BTs was MBT, although there was a little difference with a survey site. No correlations were obtained between organic matter or particles size of surface sediments and total BTs, indicating that these factors did not affect on the distribution of BTs. It was estimated that more complex factors including BTs loads and surrounding sedimentary environments, affected on the distribution of BTs. The high correlations between BTs indicated that DBT and MBT were mainly degraded from TBT based on antifouling paints of vessel etc. and other sources, such as DBT and MBT, could be ignored. The butyltin degradation indexes ([DBT] + [MBT]/[TBT]) were in the range of 1.5~3.3 (mean 2.5), indicating that the parent compound, TBT, were inflowed into the surface sediments a long years ago and degraded.
천연 제올라이트에 의한 Phosphamidon 및 Fenitrothion의 흡착 특성
감상규,허철구 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-
The adsorption characteristics of phosphorus insecticides(phosphamidon and fenitrothion) used in large amounts in golf course in natural zeolite(clinoptilolite) was investigated. The distribution coefficient, K_D and Freundlich constant, K_F, were higher for fenitrothion than those for phosphamidon, i.e., fenitrothion with the higher octanol-water partition coefficient(K_OW) was adsorbed the more on natural zeolite. The pesticide amount per unit mass of natural zeolite, decreased with increasing temperature but independent of pH, regardless of pesticides used in this study.
수중의 Pyrene, Chrysene 및 Benzo[a]pyrene의 광분해(I)
김지용,허철구,이민규,감상규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.3
The photodegradation of pyrene, chrysene and benzo[a]pyrene, that were similar in structure among polycyclic aromatic hydrocarbons (PAHs), were investigated in water irradiated with a low-pressure mercury lamp (wavelength of 253.7㎚ and UV output of 1.35×10^-3J/s). The effects of several factors (t-BuOH, HCO_3^- and pH) on photodegradation of above three PAHs were also examined. The photodegradation rates of PAHs decreased with increasing the concentration of t-BuOH, but decreased little with increasing the concentration of HCO_3^- under the concentrations used in this study. The photodegradation rates of PAHs decreased with increasing pH, but their change were greater in case of pH increase from acid to neutral and were little in case of pH increase from neutral to base. The photogradation rates of PAHs fitted a first-order kinetic model and their photogradation rates decreased in the following sequences: pyrene>chrysene>benzo[a]pyrene among the PAHs used.
High Performance Liquid Chromatographic Analysis of Omeprazole in Human Plasma
Kam, Sung-Hoon,Lee, Yoo-Chul,Lee, Jang-Won,Chi, Sang-Cheol 성균관대학교 약학연구소 1993 成均藥硏論文集 Vol.5 No.1
An HPLC procedure with UV detection has been developed fro the quantitation of omeprazole in human plasma. The drug and the intermal standard (benzocaine) were extracted from plasma with ethyl acetate and quantitated using a reverse-phase C_18 column. The chromatograms were completely free from interfering peaks, and the retention time of the omeprazole and the internal standard were 6.5 min and 10.0 min, respectively. Calibration plots were linear over the concentration range of 100∼1,000 ng/ml of omeprazole with the correlation coefficients all higher than 0.999. The mean interday precision and accuracy over three days were 3.12% and 4.02%, respectively. The mean interday precision and accuracy over three days were 3.12% and 4.02%, respectively. The mean recoveries over the entire calibration range were 96.2% for the drug and 91.3% for the internal standard. The limit of detection for omeprazole was 0.5 ng/ml. The method was simple, reliable and accurate for the quantitation of omeprazole in human plasma.
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.