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국내 변성암 지역 음용지하수 중 자연방사성물질(<sup>238</sup>U, <sup>222</sup>Rn)의 환경 특성 연구
주병규,김문수,정도환,홍정기,김동수,노회정,윤정기,김태승,Ju, Byoung Kyu,Kim, Moon Su,Jeong, Do Hwan,Hong, Jung Ki,Kim, Dong Su,Noh, Hoe Jung,Yoon, Jeong Ki,Kim, Tae Seung 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.3
This study has investigated naturally occurring radioactive materials (N.O.R.M; $^{238}U$, $^{222}Rn$) for 353 drinking groundwater wells in metamorphic rock areas in Korea. Uranium concentrations ranged from N.D (not detected) to 563.56 ${\mu}g/L$ (median value, 0.68 ${\mu}g/L$) and radon concentrations ranged from 108 to 11,612 pCi/L (median value, 1,400 pCi/L). Uranium and radon concentrations in the groundwater generally are similar to USA with similar geological setting. Uranium concentrations in 9 wells (2.6%) exceeded 30 ${\mu}g/L$, which is the maximum contaminant level (MCL) by the US environmental protection agency (EPA), radon concentrations in 46 wells (13%) exceeded 4,000 pCi/L, which is the Alternative MCL (AMCL) by the US.EPA. The log-log correlation coefficient between uranium and radon was 0.32. The correlation coefficient between uranium and pH was 0.12 and the correlation coefficient between radon and temperature was -0.01. The correlation coefficient between uranium and $HCO_3$ was 0.09 and the correlation coefficient between uranium and Ca was 0.11. The median value of uranium was high Chung-Buk (1.78 ${\mu}g/L$), Gyeong-Buk (1.37 ${\mu}g/L$), In-Cheon (1.06 ${\mu}g/L$) for each province. On the other hand, the median value of radon was high In-Cheon (2,962 pCi/L), Chung-Buk (2,339 pCi/L), Jeon-Buk (2,165 pCi/L) for each province. Jeon-Buk for log-log correlation coefficient is the highest (0.63) among provinces.
다공성 매체내 유기용매(DNAPL)의 용해현상시각화 및 정량화 연구
주병규,정승우 유기성자원학회 2008 유기물자원화 Vol.16 No.1
Oils and chlorinated solvents leaking to the subsurface are entrapped in the soil pore and these are called as nonaqueous phase liquids (NAPL). NAPL entrapped in porous media acts as a continuous source for surface and ground water contamination. This study visualized dissolution of trichloroethylene (TCE) entrapped in porous media and quantified the velocity of TCE dissolution using an image analysis technique. As the water velocity increased, the level of dissolution increased. The results imply that a TCE contaminated region having a high infiltration rate and groundwater velocity may result in severe groundwater contamination. Microscopic images of TCE entrapped in porous media showed that TCE present in the preferential flow paths was easily dissoluted into the water phase. However, TCE present in the stagnant flow region was visualized for long time. The results imply that TCE would be still present in the soil if TCE is detected in goundwater.
주병규,정승우,송충현 대한환경공학회 2007 대한환경공학회 학술발표논문집 Vol.2007 No.12
Benzene과 Methyl tert buthyl ether(MTBE)의 기본적인 용해 특성을 파악하기 위해 마이크로 모델을 이용한 소규모 실험을 진행하였다. 실험은 Benzene단독 용해, MTBE 단독 용해, Benzene+MTBE(2:1혼합) mixture용해로 나누어서 진행하였다. 실험 변수는 주입하는 유체의 유량을 변화시켜 시간에 따른 농도, saturation을 분석하였다. 실험결과 Benzene의 경우 용해특성은 주입유량과 접촉시간에 따라 큰 영향을 받는 것으로 파악되고 MTBE와 Benzene+MTBE mixture보다 오랜시간 동안 잔여하며 용해되는 것으로 파악되었다. MTBE단독 용해의 경우 연구된 세 물질중 가장 빠르게 용해되는 것으로 나타났다. Benzene+MTBE mixture의 경우 세 물질중에서 중간정도의 빠르기로 용해되는 것으로 나타났다. 이 결과는 혼합물질의 구성성분이 다른 물질의 용해특성에 영향을 준다는 것을 알 수 있다. 본 연구결과는 오염확산이해 및 LNAPL복원기술의 기초자료로 이용될 수 있을 것이다.
주병규,김문수,김현구,김동수,김영록,정도환,양재하,박선화,김태승,Ju, Byoung Kyu,Kim, Moon Su,Kim, Hyun Koo,Kim, Dong Su,Kim, Young Rok,Jeong, Do Hwan,Yang, Jae Ha,Park, Sun Hwa,Kim, Tae Seung 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3
In order to study gross alpha analysis method using LSC, the efficiency tests with uranium standard materials were performed and then compared with the GPC method (US EPA 900.0 method) using 15 groundwater samples. For 15 groundwater samples, the average efficiencies of the GPC and LSC method were 7~11% and 90%, respectively. The average precisions of the GPC and LSC method were 16.16% and 6.00%, respectively. Also, The average standard deviations for 15 samples were 7.38 pCi/L and 2.95 pCi/L, respectively. The determination coefficient of the tested results by two methods was 0.9948. As a result, the LSC method tested in this study was applicable for the screening of the gross alpha and showed the advantages in the gross alpha measurement due to the simple measurement procedures.
감마선분광분석기와 액체섬광계수기를 이용한 226Ra 분석법 비교 연구
주병규,김문수,김현구,김동수,조성진,양재하,박선화,김형섭,권오상,김태승 한국분석과학회 2015 분석과학 Vol.28 No.3
The efficiency and applicability of the solid phase extraction disk method in a 226Ra analysis were examined by the gamma ray spectrometer (GRS) method using a Marinelli beaker and the liquid scintillation counter (LSC) method for groundwater. The recovered 226Ra, which was filtered by the solid phase extraction disk, was analyzed using gamma ray spectrometer The disks, which were pretreated for caulking the daughter nuclide, were sealed with polyethylene film. Distilled water was used for the blank value of the 226Ra activity. The recovery values of 214Bi and 214Pb in the solid phase extraction disk, which used 226Ra standard material, were 80% (295.21 Kev) and 104% (351.92 Kev), respectively, which were higher than 75% determined by the LSC. The injection of nitrogen gas into the measuring chamber reduced the interference values by about 10%. The detection limits of the 226Ra activity in a blank sample of 5 L were 0.17~0.40 pCi/L after 80,000 seconds of measuring time. The relationship of the 226Ra activity in the solid phase extraction disk method and in the LSC method in seven groundwater samples showed a correlation coefficient value 0.987, which implies the applicability of the solid phase extraction disk method. The results showed that 226Ra activity in groundwater using the solid phase extraction disk method has the following benefits: simple pretreatment, time saving, high recovery values, a low detection limit, and so on. Compared with the LSC method and the GRS method using the Marinelli beaker for the 226Ra analysis, the solid phase extraction disk method could be useful in groundwater samples with low levels of activities of radionuclides because the method is not restricted by the volume of the sample.
마이크로공극분석기를 이용한 Trichloroethylene의 용해 물질전달계수 산정
주병규,정승우 대한환경공학회 2006 대한환경공학회 학술발표논문집 Vol.2006 No.12
국내·외의 대표적인 토양·지하수 오염물질인 트리클로로에틸렌(TCE)은 토양 공극내 비수용성액체로 존재하면서 토양공기 및 지하수를 오염시키는 오염원이다. 토양공극내 비수용성액체의 정화를 위해 가장 많이 사용하고 있는 방법은 양수처리법(pump-and-treat)이다. 그러나 TCE의 용해도가 비교적 낮고 TCE가 토양공극내 다양한 형태로 분포하고 있는 특성으로 인해 TCE 정화에 많은 시간과 비용이 소요된다. 또한 이러한 점들은 현장 모니터링결과와 지하수모델링결과가 불일치하는 가장 큰 이유에 해당한다. 본 연구에서는 토양공극내 TCE의 존재 형태에 따른 용해특성을 연구하여 TCE의 용해 물질전달계수(Mass transfer rate coefficient)를 산정하고자 하였다. 토양공극내 TCE의 용해특성을 파악하고 정확한 물질전달계수의 산정은 양수처리법의 설계 및 지하수 모델링에 있어 효율적인 설계 및 예측을 위해 필요한 기본정보이다. 마이크로 공극분석기를 통하여 마이크로 공극내 TCE 형태의 변화와 유출수의 농도를 모니터링 하였다. TCE의 용해특성은 유량과 밀접한 관계를 가지고 있었으나, 기존문헌에는 물질전달계수 산정에 계면면적이 차지하는 역할이 매우 적은 것으로 되어 있으나, 본 연구결과 계면면적의 중요성이 확인되었다.