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고함량 자연방사성물질 우려지역에 대한 지하수 환경 특성 연구
정도환,엄익춘,윤정기,김문수,김영규,김태승,Jeong, Do-Hwan,Eom, Ig-Chun,Yoon, Jeong-Ki,Kim, Moon-Su,Kim, Yeong-Kyoo,Kim, Tae-Seung 한국지하수토양환경학회 2010 지하수토양환경 Vol.15 No.6
Groundwater sampling was performed at 38 wells where they are located in the areas with high uranium and radon (marked as A and B, respectively) concentrations, which were based on the previous research results. In-situ parameters (temperature, pH, EC, Eh, DO) and natural radionuclides (uranium and radon) were analyzed to figure out the characteristics of groundwater environments. In-situ data did not show any relations to natural radionuclide data, which could be caused by groundwater mixing, depths of wells, and geological settings, etc. But the highest radon well presented relatively low temperature value and the highest uranium well presented relatively low pH values The highest uranium concentration ranging $1.14{\sim}188.19{\mu}g/L$ showed in the area of A region consisted of Jurassic two-mica granite. The areas of Jurassic biotite granite and Cretaceous granite in the A region have the uranium concentrations ranging $0.10{\sim}49.78{\mu}g/L$ and $0.36{\sim}3.01{\mu}g/L$, respectively. The uranium values from between wells of community water systems (CWSs) penetrating fractured bed-rock aquifers and personal boreholes settled in shallow aquifers near the wells of CWSs show big differences. It implies that the groundwaters of the two areas have evolved from different water-rock interaction paths that may caused by various types of wells having different aquifers. High radon activities in the area of B region composed of Precambrian gneiss showed ranging from 6,770 to 64,688 pCi/L. Even though the wells are located in the same geological settings, their rodon concentration presented different according to depth and distance.
4대강 유역 및 공단지역 환경 중 PFOS 및 PFOA의 잔류수준 비교평가
조천래 ( Chon Rae Cho ),엄익춘 ( Ig Chun Eom ),김은주 ( Eun Ju Kim ),김수진 ( Sue Jin Kim ),최경희 ( Kyung Hee Choi ),조현서 ( Hyeon Seo Cho ),윤준헌 ( Jun Heon Yoon ) 한국환경분석학회 2009 환경분석과 독성보건 Vol.12 No.4
PFCs are group of fluorochemicals that have been produced and used for over 50 years for various purpose including soil/stain resistance and surfactant applications. These chemicals were degraded to Perfluorooctane sulfonate (PFOS) and Perfluorooctanoic acid (PFOA) that were kinds of persistence metabolites. Previous studies showed that these chemicals can be accumulated in various environmental media. In this study, the concentration level of PFOS and PFOA were measured in 59 samples collected from 4 major river watersheds and 6 industrial complex areas in 2006 and 2007. Mean concentration of PFOS in water, sediment and soil were N.D.-1180.0 ng/L, N.D.-9.17 ng/g dry-wt. and N.D.-10.97 ng/g dry-wt. respectively. Mean concentrations of PFOA in water, sediment and soil were N.D.-13850.0 ng/L, N.D.-2.07 ng/g dry-wt. and N.D.-1.04 ng/g drywt., respectively. The concentration of PFOS in water samples were significant difference among river, industrial complex stream and waste water treatment effluent (p<0.05). But PFOA were no significant difference among those samples. These results suggested that concentration of PFOS in water was direct effected by industrial complex activities.
조천래(Chonrae Cho),조재구(Jae-Gu Cho),엄익춘(Ig-chun Eom),이병천(Byoung-cheun Lee),김수진(Sue-jin Kim),최경희(Kyunghee Choi),윤준헌(Junheon Yoon) 환경독성보건학회 2010 환경독성보건학회지 Vol.25 No.3
During the last decade, perfluorinated compounds (PFCs) have gained more attention due to their toxicity and global distribution. The aim of this study was to examine the distribution and bioaccumulation of perfluorinated compounds (PFCs) in aquatic wildlife effected from a sewage treatment plant. The concentrations of 12 PFCs were determined in water, sediment and fish samples. PFOS were predominantly detected in both ambient environment and fish. In fish, the concentration of PFCs in blood was the highest (i.e., 112.47 ng/㎖ wet-wt. PFOS) in comparison to other tissues. However, PFOA and PFHpS were highly detected in gonad as 3.87 and 4.58 ng/g wet-wt., respectively. The bioconcentration factor (BCF) of PFCs was greatest in the blood> liver?gonad > kidney> gill, and lowest in the muscle tissue. The BCFs of PFUnDA (39,000), PFDA(2.700) and PFOS (1,100) were rated as high values based on wet weight concentration. BCFs increased with increasing the length of the perfluoralkyl chain.
Chronic effects of zinc oxide nanoparticles on growth and reproductivity of Cyprinus carpio
Ji-eun Kim(김지은),Kyunghwa Park(박경화),Ig-chun Eom(엄익춘),Jae-woo Lee(이재우),Kyung-tae Kim(김경태),Yu-jin Shin(신유진),Mi-kyung Kim(김미경),Hee-jung Kim(김희정),Pilje Kim(김필제),Kyunghee Choi(최경희) 환경독성보건학회 2015 한국독성학회 심포지움 및 학술발표회 Vol.2015 No.10
김성희(Sung Hee Kim),이우춘(Woo Chun Lee),김순오(Soon Oh Kim),나소영(So Young Na),김현아(Hyun A Kim),이병태(Byung Tae Lee),이병천(Byoung Cheun Lee),엄익춘(Ig Chun Eom) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.11
최근 들어 나노기술의 발전에 따라 다양한 산업 및 상업분야에서 나노물질의 사용이 급증하고 있다. 이러한 나노물질이 환경에 유출되어 사람의 건강 및 생태계에 악영향을 줄 수 있다는 문제가 지속적으로 제기되어 왔다. 이에 따라 다양한 환경매질 내에서 나노물질의 거동특성 및 생독성 등에 대한 평가들이 요구되어진다. 이러한 평가들이 진행되기 위해서 필연적으로 다양한 매체 내에서 존재하는 나노물질을 효과적으로 분리하고 이들의 특성을 정량화하는 기술들이 수반되어야 한다. 본 논문에서는 이러한 나노물질의 분리기술들 중 시료의 교란이 비교적 적고 전처리과정이 단순한 장-흐름 분획기술을 이용한나노물질 분리에 대한 국내외 선행연구들을 살펴보았다. 특히 가장 많이 활용되어온 흐름 장-흐름 분획기를 중심으로 기본원리를 살펴보고 분리대상인 나노물질의 종류에 따라서 지금까지 수행되어온 연구들을 분류하고 분석해 봄으로써 이 분야의 연구자들에게 실제적인 정보를 제공하고자 한다. 장-흐름 분획기를 이용하여 다양한 환경매질로부터 나노물질을 효과적으로 분리하기 위해서 분리대상인 나노물질의 종류와 특성을 고려한 전처리, 적절한 멤브레인과 운반용액의 선택, 흐름조건의 최적화 등이 중요한 것으로 조사되었다. 뿐만 아니라 분리 후 나노물질의 특성을 정량화하기 위해서 다양한 검출기 및 분석기와의 연계가 필수적으로 보인다. 하지만 아직까지 일부 환경매질에만 국한되어 연구가 진행되었으며, 또한 분리대상인 나노물질의 종류도 극히 제한적인 것으로 조사되었다. 특히 이러한 나노물질에 대한 분리 및 측정에 대한 국내 연구는 매우 부족한 실정이며 나노물질 사용량이 급증하고 있는 현실을 고려하면 이 분야에 대한 연구가 절실히 요구된다. Recently, the consumption of nanomaterials has been significantly increased in both industrial and commercial sectors, as a result of steady advancement in the nano-technologies. This ubiquitous use of nanomaterials has brought up the concern that their exposure to environments may cause detrimental effects on human health as well as natural ecosystems, and it is required to characterize their behavior in various environmental media and to evaluate their ecotoxicity. For the sake of accomplishing those assessments, the development of methods to effectively separate them from diverse media and to quantify their properties should be requisitely accompanied. Among a number of separation techniques developed so far, this study focuses on Field-Flow Fractionation (FFF) because of its strengths, such as relatively less disturbance of samples and simple pretreatment, and we review overseas and domestic literatures on the separation of nanomaterials using the FFF technique. In particular, researches with Flow Field-Flow Fractionation (FlFFF) are highlighted due to its most frequent application among FFF techniques. The basic principle of the FlFFF is briefly introduced and the studies conducted so far are classified and scrutinized based on the sort of target nanomaterials for the purpose of furnishing practical data and information for the researchers struggling in this field. The literature review suggests that the operational conditions, such as pretreatment, selection of membrane and carrier solution, and rate (velocity) of each flow, should be optimized in order to effectively separate them from various matrices using the FFF technique. Moreover, it seems to be a prerequisite to couple or hyphenate with several detectors and analyzers for quantification of their properties after their separation using the FFF. However, its application has been restricted regarding the types of target nanomaterials and environmental media. Furthermore, domestic literature data on both separation and characterization of nanomaterials are extremely limited. Taking into account the overwhelmingly increasing consumption of nanomaterials, the efforts for the area seem to be greatly urgent.