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숯의 유해물질과 이들의 연소 중 상변화에 대한 열분석 연구
윤혜온 ( Hye On Yoon ),김기현 ( Ki Hyun Kim ) 한국광물학회 2011 광물과 암석 (J.Miner.Soc.Korea) Vol.24 No.2
숯은 제조 및 활용과정에서 연소를 통해 함유된 성분들을 방출한다. 연소는 숯의 화학조성뿐만 아니라 숯의 표면 물성변화를 초래하고 다른 성분을 흡착하기 쉬운 상태로 변형시키기도 한다. 본 연구에서는 국내에서 시판되는 4종 숯에 대하여 화학적, 열적안정성과 중금속 및 유기유해물질의 거동 연구를 수행하였다. 상온에서 400℃까지 열중량분석(TGA)과 시차주사열량계를 이용한 연소에 따른 중량변화와 관련된 물질거동 연구를 수행하였다. TGA 분석결과 대부분 시료에서 200℃ 이전 약 10% 중량이 감소하였으며, 200℃ 이전에 잔류유기물과 가스상 물질이 소실되는 것을 알려준다. 열분석에 의한 질량 감소는 천연숯과 인공숯에서 다르게 측정되었다. 천연숯 K1, C1에서는 400℃까지의 가열 반응결과 약 15% 중량 감소가 있었으며, 인공숯 K2, C2의 경우 약 20%의 중량 감소가 있는 것으로 검출되었다. 가열에 의한 400℃ 이하 중량감소는 주요 유기물과 VOC의 소실에 기인하는 것으로 나타났다. 화학조성분석에 근거한 X-선 회절분석을 실시하였다. 분석결과 첨가제인 Ba이 Ba(NO3)2 및 BaCO3 등의 형태로 NaNO3와 함께 숯에 다량 존재하는 것으로 분석되었다. Charcoal burning in the process of manufacture and ordinary use often release many constituent chemical species. As a result of open burning, the chemical composition as well as the physical properties of original material changes through the modification of surface properties of charcoal. Surface modification could be more responsible toward the outside elements for surface adsorption, it becomes easy to adsorb more toxic elements through surface adsorption. In this study, four kinds of commercially available charcoal were studied against the chemical and thermal stability along with the heavy metals and organic hazardous substances. Thermo gravimetric analysis (TGA) and differential scanning calorimetry, from room temperature to 400℃, were performed to study the weight loss and the changes in the behavior of those substances. According to TGA analysis, about 10% of weight loss was happened before 200℃. It was found that related weight loss of this temperature region may responsible to the gas phase organic matter. Natural charcoal, K1 and C1 show 15% of loss during the reaction heated to 400℃, while the artificial charcoal K2, C2 show the weight loss of about 20% was found. This is consistent with the main organic matter and VOC analysis results shown. Chemical composition based on the x-ray diffraction analysis was carried out. X-ray diffraction analysis reveals the existence of chemical additive in the forms of Ba(NO3)2, BaCO3, and NaNO3.
윤혜온(Hye On Yoon),(Richard J. Reeder) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.2
The sorption of Cd^2+ on calcite was studied in aqueous solutions of several electrolytes. The Cd^2+ concentration, 10^-8 M, was kept well below saturation with respect to CdCO_3(s). Sorption behavior of Cd^2+ in different ionic strengths of NaClO_4 solutions shows that sorption is independent of ionic strength. This result suggests that Cd^2+ sorption on calcite surface is of a specific nature, and adsorption is controlled by an inner-sphere type of surface complex. Two stages in the sorption behavior could be identified: an initial rapid uptake, followed by slower uptake reaching a maximum steady state by 145 hrs. No evidence was observed for surface precipitation, although it can not be entirely ruled out. Desorption of Cd^2+ from the calcite surface after resuspension into Cd-free solution is initially very rapid, but depends partly on the previous sorption history. Desorption behavior of Cd^2+ show that an initial rapid desorption followed either by slow uptake reaching a maximum, as in the adsorption experiments, or slowing desorption to reach a steady state minimum. This irreversible behavior of Cd^2+ sorption and desorption may act as one of the controls for regulating the mobility of dissolved Cd^2+ in natural aqueous systems. Calculated adsorption partition coefficients suggest that overall sorption and desorption process in the concentration range are controlled by a single mechanism.
울산광산 주변지역 수계에서 유기 및 무기 비소 종 분포
김연태,우남칠,윤혜온,윤철호,Kim, Youn-Tae,Woo, Nam-Chil,Yoon, Hye-On,Yoon, Cheol-Ho 대한자원환경지질학회 2006 자원환경지질 Vol.39 No.6
비소 오염이 심각한 것으로 알려진 울산광산과 인근지역의 수환경에 대한 비소 오염도와 종 분포 특성을 조사하였다. 채취한 광산 내 지하수 시료의 62%에서 우리나라 먹는물 수질 기준인 0.05 mg/l를 초과하는 비소 농도가 검출되었다. 비소는 모두 무기종으로, As(V)가 우세하고 일부 지점에서 As(III)이 검출되었다. 지하수 내 비소는 관측정을 통한 산화환원환경의 변화로 인해 새로운 평형으로 이동하는 과정 중으로 유추된다. 주변수계는 울산광산과 천곡약수가 비소의 주 오염원으로 파악되며, 지하수와 하천수 시료의 $30{\sim}33%$가 총 비소농도 0.05 mg/l를, $60{\sim}67%$ 시료가 0.01 mg/l를 초과하였다. 특히 천곡약수는 0.345 mg/l의 비소 농도를 보여 먹는물 수질기준의 7배에 달하는 오염도를 보인다. 지하수와 천곡약수에서 비소는 모두 As(V) 형태로 존재하였으나, 농도가 높은 일부 지점에서는 As(III)이 검출되었다. 한 지점에서는 DMA, AsB와 같은 유기비소가 소량 검출되어, 비소의 종 변이 또는 유기적 기작의 관련성을 제시한다. Distribution and speciation of arsenic in water resources was investigated in the Ulsan mine area. In 62% of uoundwater samples from the mine area, total As concentrations exceeded 0.05 mg/l, the Korean Drinking Water Standard. As(V) was the major type in groundwater with minor As(III). Arsenic species appeared to be in transition stages following redox changes after exposure to the air through the monitoring wells. In areas around the mine, the mine and Cheongog spring appeared to be the sources of arsenic contamination of water resources. The spring showed 0.345 mg/1-As, as much as seven times of the Korean standard. Groundwater and stream samples showed As-concentrations greater than 0.05 mg/l in 30% and 33% samples, respectively, and 60 and 67% of samples exceeded 0.01 mg/l of WHO guideline, respectively. Again, As(V) was a dominant species, however, several samples had As(III) in appreciable levels. In one stream sample, organic species including DMA and AsB were detected in low levels, probably resulted from transformation or related biogeochemical processes.
안진성,김주애,윤혜온,An, Jinsung,Kim, Joo-Ae,Yoon, Hye-On 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.1
Current status of soil contamination with fluorine and its source were investigated. The basic principles and procedures of various techniques for the analysis of fluorine contents in soil and solid phase samples were summarized in this review. Analysis of fluorine in solid matrices can be achieved by two types of techniques: (i) UV/Vis spectrophotometer or ion selective electrode (ISE) analysis after performing appropriate extraction steps and (ii) direct solid analysis. As the former cases, the standard method of Korean ministry of environment, alkali fusion-ISE method, pyrohydrolysis, oxygen bomb combustion, aqua regia digestion-automatic analysis, and sequential extraction-ISE method were introduced. In addition, direct analysis methods (i.e., X-ray fluorescence spectrometry and proton induced gamma-ray emission spectrometry) and atomic spectrometry combining with the equipment for introducing solid phase sample were also reviewed. Fluorine analysis techniques can be reasonably selected through site-specific information such as matrix condition, contamination level, the amount of samples and the principles of various methods for the analysis of fluorine presented in this review.
불산 누출사고 지역 토양수의 지구화학적 특성을 통한 불소 거동 및 확산 잠재성 연구
권은혜,이현아,김도영,이준석,이상훈,윤혜온,Kwon, Eunhye,Lee, Hyun A,Kim, Doyoung,Lee, Junseok,Lee, Sanghoon,Yoon, Hye-On 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.3
The hydrofluoric acid (HF) leakage accident occurred on September 2012 in Gumi, Korea affected the surrounding soils and plants. In this study, we investigated fluoride migration in Gumi area through geochemical properties of soil-liquid phase (pore water F and water-soluble F). The concentrations of porewater F and water-soluble F were obtained from N.D (Not detected) to 9.79 mg/L and from 0.001 to 21.4 mg/L, respectively. F in pore water seemed to be affected by artificial and natural origin, and PHREEQC results implied that fluorite is F control factor. F concentrations of soil and soil-liquid phase did not exceed concern level of regulatory criteria and showed similar trends compared by previous studies. Therefore, F contents remained in the soil and soil-liquid phase were considered to be not affected by HF leakage accident.