• Proceedings of the KSEEG Conference
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• 2002.04a
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• pp.438-439
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• 2002

• The Journal of Engineering Geology
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• v.10 no.2
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• pp.215-233
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• 2000

The national geochemical baseline mapping project has been conducted since 1996 to establish a quantitative assessment system for geochemical hazards in natural environments. The geochemical image maps have been edited for thirty-six elements(i.e., 10 major oxides and 26 trace elements) in light sediments, finer fraction than 150 $\mu$m, collected from first- to second-order streams(totally 11,000) over five provinces in the western half(ca. 45,000 km$^2$) of Korea. Natural background values of the elements were given for different geological environments. Based on the statistics, geochemical baselines were newly obtained for a quantitative hazard assessment on toxicity of heavy metals and deficiency of essential nutrients. Some chosen examples of geochemical hazards are presented based on new geochemical image maps and related baseline data.

• Journal of the Korean earth science society
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• v.24 no.5
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• pp.420-427
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• 2003

The results of recent studies indicate that atmospheric distribution of Hg in the arctic environment is unique enough to show strong depletion during spring followed by notable increases during summer. The observations of this abnormal trend contrast quite sharply with what had been recognized as Hg geochemical behavior in air over the past decades. Using the long-term measurement data of Hg obtained from both the Arctic and Korea, we attempted to provide valuable insights into the unique mercury depletion phenomenon (MDP) in the polar regions of the globe.

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.236-238
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• 2007

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2002.04a
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• pp.176-178
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• 2002

• Economic and Environmental Geology
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• v.12 no.3
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• pp.127-146
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• 1979

Though tungsten minerals have been mined for over fifty years in Korea, which has become one of the worlds largest tungsten producers since 1951, knowledge of their mineralogy and geochemistry is somewhat limited to the school of tungsten students. There is a considerable amount of literature throughout the world on the tungsten mineralogy, the geochemical behaviour of tungsten, the nature of tungsten deposits and geological environments for tungsten mineralisation. Commonly known tungsten minerals such as scheelite and wolframite belong to one of two series, the scheelite or the wolframite series, as the primary tungsten minerals. Secondary tungsten minerals are known rather rare, however, some of them plays an important role-of exploration guide in search for tungsten deposits. The geochemistry of tungsten is imperfectly known, and apparently the behaviour of tungsten in geological processes has been the subject of few studies. Recently, some aspects of the fundamental geochemistry of tungsten has been worked out and compiled the data in broad the up to date by many authors. In order to facilitate the better understanding and future exploration of tungsten deposits, an attempt has been made to summarise the existing knowledge of the fundamental geochemistry of tungsten, together with its common geochemical association with various types of tungsten deposits.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.225-228
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• 2000

대류권내에 존재하는 질소산화물(NO$_{y}$ )은 지구대기의 대기화학변화에 매우 중요한 역할을 한다. NO$_{x}$는 대류권 하층에서 광화학 과정에 관여하여 탄화수소와 함께 오존(O$_3$)을 포함한 광화학스모그를 발생시키는 역할을 한다. 또한 질소산화물 중 아산화질소($N_2$O)는 매우 안정한 기체로서 NO$_{x}$처럼 대류권내에서 활발한 화학 반응에 관여하지는 않지만, 메탄(CH$_4$), 이산화탄소($CO_2$), 오존(O$_3$) 등과 함께 지구온난화에 기여하는 온실기체로서 지구기후변화와 밀접하게 연관되어 있다. (중략)

• Journal of the Korean earth science society
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• v.31 no.4
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• pp.301-312
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• 2010

Geochemical data have been regarded as one of the important environmental variables in the environmental management. Since they are often sampled at sparse locations, it is important not only to predict attribute values at unsampled locations, but also to assess the uncertainty attached to the prediction for further analysis. The main objective of this paper is to exemplify how indicator geostatistics can be effectively applied to geochemical data processing for providing decision-supporting information as well as spatial distribution of the geochemical data. A whole geostatistical analysis framework, which includes probabilistic uncertainty modeling, classification and risk analysis, was illustrated through a case study of cadmium mapping. A conditional cumulative distribution function (ccdf) was first modeled by indicator kriging, and then e-type estimates and conditional variance were computed for spatial distribution of cadmium and quantitative uncertainty measures, respectively. Two different classification criteria such as a probability thresholding and an attribute thresholding were applied to delineate contaminated and safe areas. Finally, additional sampling locations were extracted from the coefficient of variation that accounts for both the conditional variance and the difference between attribute values and thresholding values. It is suggested that the indicator geostatistical framework illustrated in this study be a useful tool for analyzing any environmental variables including geochemical data for decision-making in the presence of uncertainty.

• Proceedings of the KSEEG Conference
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• 2003.04a
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• pp.93-96
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• 2003

국내 휴ㆍ폐금속광산 주변지역을 대상으로 광산활동으로 인한 독성 중금속 원소들의 주변 환경 유출과정 및 정도를 규명하여 생활에 미치는 환경오염의 가능성을 조사하는 환경지구 화학적 연구가 지속적으로 이루어지고 있다. 이들 중의 대부분은 적절한 환경복원시설이 설치되지 않아, 방치된 광미와 폐석에 의해 주변지역의 환경오염이 발생되는 것으로 보고되고 있다. 국외의 경우 광산활동의 주요한 폐기물인 광미와 폐석에 대한 매립 및 처리 모델 개발, 침출수 관리 등 다양한 환경오염 방지 및 복구 연구가 수행되고 있다. (중략)

• Clean Technology
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• v.15 no.3
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• pp.224-230
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• 2009

Life Cycle Assessment (LCA) has been studied on the reuse of glass bottles. The system boundary in this study encompassed from gate to gate such as production and transportation. A 360 mL volume of a glass bottle was selected as the functional unit. The environmental impact assessments was studied on 6 categories including abiotic resource depletion, acidification, eutrophication, global warming, ozone depletion, and photochemical oxidant creation. The results showed that the most significant impact categories were abiotic resource depletion (48.63%) and global warming (46.27%), and the rest categories revealed insignificant impacts. In the whole system, the chemicals used for the new bottle production revealed the major contribution to the environmental impacts (71.24%), followed by the use of electricity (16.74%) and transportation (11.8%). In addition, the environmental impact of sodium silicate to be put into the stage of the new bottle production was found to be 45.68%, causing severe influence on abiotic resource depletion and global warming.