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Cr(VI)으로 오염된 부지의 안정화 기술에 의한 정화 타당성 연구
윤근석,유종찬,고성환,심명호,조명현,백기태,Yoon, Geun Seok,Yoo, Jong Chan,Ko, Sung-Hwan,Shim, Myung-Ho,Cho, Myung-Hyun,Baek, Kitae 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.4
In this study, a remedial investigation using reductive stabilization was conducted to treat Cr(VI)-contaminated soil. The influences of various operational parameters, including reaction time and the mass of ferrous iron, were also evaluated. The study site was contaminated with a large amount of Cr(III) and Cr(VI), and the selected treatment method was to stabilize Cr(VI) with ferrous iron, which reduced Cr(VI) to Cr(III) and stabilized the chromium, although a greater mass of ferrous iron than the stoichiometric amount was required to stabilize the Cr(VI). However, some Cr(III) re-oxidized to Cr(VI) during the drying process, and addition of a strong reducing agent was required to maintain reducing conditions. With this reducing agent, the treated soil met the required regulatory standard, and the mass of Cr(III) re-oxidized to Cr(VI) was significantly reduced, compared to the use of only Fe(II) as a reducing agent.
수계 화학사고 물질의 신속한 측정을 위한 온라인 헤드스페이스-직접 질량분석법 개발
윤근석 ( Geun-seok Yoon ),이선홍 ( Sun-hong Lee ),최재원 ( Jae-won Choi ) 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.3
In the present study, real-time analytical method was developed to monitor the sudden chemical discharge or accident. Selected Ion Flow Tube-Mass Spectrometry (SIFT-MS) coupled with online headspace technique was applied to evaluate the feasibility of 12 organic compounds in aqueous samples for the first time in Korea. Target compounds were calibrated at five points ranged from 0.5 to 5 mg/L. As a result, the correlation coefficients of calibration curves were in the range of 0.92-0.99. From the repeated measurements, the limit of quantification (LOQ) was ranged between 0.11 and 1.28 mg/L. In the fugacity approach (closed system, steady-state assumption) transport of chemicals into the headspace is highly correlated with the air-water partition coefficient (K<sub>AW</sub>). 1,1-dichloroethene and propylene oxide showed quadratic types of calibration curves due to relatively high K<sub>AW</sub> values. These studies showed that the most organic compounds were clearly detected compared with Korean ambient water analytical guidelines. Thus, with further improvements in the increase of sensitivity and the number of detectable compounds could be a valuable online aquatic monitoring strategy.