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김경태,박준범,Kim, Kyungtae,Park, Junboum 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.3
Rhodamine B Hydrazide as a novel fluorescent and colorimetric probe exhibiting remarkably selective fluorescence enhancement toward Hg<sup>2+</sup> ion over other 16 metal ions is herein introduced. The probe reacts with Hg<sup>2+</sup> ion followed by its spirolactam ring-opening to give a remarkable enhancement of absorption maximum at 550 nm as well as an enhanced fluorescence intensity at 580 nm in aqueous media. Upon titration with Hg<sup>2+</sup> ion in various concentration of 10~200 uM, we found that the probe shows a marked color change from colorless to pink, enabling naked-eye detection toward mercury ion. In addition, in the presence of Hg<sup>2+</sup> ion, the probe gave rise to change from non-florescence to strong orange fluorescence (Off-On) with a good linearity of R<sup>2</sup>=0.97. This preliminary results demonstrate that the fluorescent chemosensor we herein introduced can open a new strategy for marked selective and sensitive detection of mercury ions in contaminated soil containing various metal ions.
개량 벤토나이트와 현장토 혼합 차수층의 염수조건하에서의 투수성 평가
서흠,오명학,박준범,Xu, Xin,Oh, Myounghak,Park, Junboum 한국지반공학회 2017 한국지반공학회논문집 Vol.33 No.11
벤토나이트와 현장토를 혼합하여 차수재료로 폐기물 매립장의 차수층에 많이 적용하고 있다. 차수층으로 사용되는 재료는 일반적으로 투수계수가 $1{\times}10^{-7}cm/s$ 이하인 재료를 사용한다. 벤토나이트를 현장에서 차수층 재료로 사용될 때 벤토나이트는 건조-수축 균열 발생 및 염수조건에서 팽창성 떨어지고 차수 기능을 상실하는 등의 문제점이 존재한다. 벤토나이트의 문제점을 극복하기 위해 본 연구에서는 균열 방지 및 해수조건에서 차수성을 확보할 수 있는 내염성 벤토나이트를 개발하였고, 건조수축균역 시험, 팽윤도 시험, 다짐시험 및 투수실험을 통해 내염성 벤토나이트의 혼합비 결정 및 성능을 평가하였다. A bentonite mixing with local soil widely used as liner layer for landfill should have low permeability less than $1{\times}10^{-7}cm/s$. But there are several limitations of bentonite used as liner layer, such as drying shrinkage cracking, ineffective waterproof ability under salt water condition like flocculation under sea water. The purpose of this research is the development of a salt resistance bentonite by mixing sepiolite and guar gum to overcome the weak points of bentonite to get high water resistance capacity and permeability coefficient below $1{\times}10^{-7}cm/s$ under salt water condition. After having performed drying shrinkage cracking test, swelling index test, compaction test, and hydraulic conductivity test we confirmed the optimal mixing ratio of materials and evaluated the performance of materials.
박인준,곽창원,박준범,한자중,Park,Innjoon,Kwak,Changwon,Park,Junboum,Han,Jajung 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5
최근 늘어나고 있는 폐기물량에 따라 폐기물 매립장의 건설이 증가하고 있으며, 매립장 내 폐기물의 격리, 보호 및 환경오염방지를 위하여 토목섬유가 널리 활용되고 있다. 토목섬유는 주변의 흙과 접촉면을 형성하여 폐기물 매립장의 전단 거동에 영향을 미치게 된다. 폐기물 침출수에 포함된 화학적 요소는 이러한 접촉면 거동에 중요한 영향을 미치며, 지진과 같은 동적하중 또한 접촉면 거동에 미치는 화학적 영향을 가속화시킬 수 있다. 따라서 본 연구에서는 화학적 영향을 고려한 접촉면 전단강도 감소효과를 반영하여 수치해석을 수행하였다. 반복 단순전단시험 결과를 바탕으로 수치해석을 수행한 결과, 접촉면 전단강도 감소를 미 고려시 폐기물 매립장의 동적 안정성을 과대평가할 수 있다고 판단된다. The number of the waste landfill site increases continuously in recent years. Various types of geosynthetics have been utilized in the waste landfill site for encapsulating, isolating, protecting, and so on. Geosynthetics compose the interface with soil and affect the shear behaviors of waste landfill system. The chemical aggressors in the leachate also play a critical role in the interface and it is known that the dynamic loading is able to accelerate manifestation of the effects of chemical attack. In this research, numerical analysis was conducted considering shear stress degradation in the geosynthetic-soil interface due to dynamic load with chemical effect. Cyclic simple shear test results was reviewed and applied to the numerical modeling as well. Consequently, the stability of waste landfill site could be overestimated without considering the shear stress degradation of interface.
Amarbayar Jugdernamjil,박준범(Junboum Park) 한국토목섬유학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.4
The purpose of this survey is to investigate the current status of metal pollution of the soil in Ulaanbaatar, the capital city of Mongolia. During the last decade, the city has been rapidly urbanized. The most soil erosion occurs in gher districts of Ulaanbaatar city. It was recently found that the arsenic(As) concentration in the soil was higher than the guideline value and the lead (Pb) content in some samples was higher than normal. The source of As pollution appears to be the coal combustion in three power plants in the city. The sources of the increase in Pb pollution might be the remarkable increase in the number of used vehicles and the increase in the use of leaded fuel in the last few years. Additionally, the concentration of heavy metals in the urban soils of Ulaanbaatar was compared with the mean values of the heavy-metal concentrations in the soils of other countries; the comparison results will shown this study.