沃川帶 南西部에 分布하는 葉理狀花崗岩類의 買入時期 및 成因的 考察

羅椿基 대한지질학회 1992 대한지질학회 학술대회 Vol.1992 No.

전주 죽림지역 온천수의 화학적 및 동위원소적 특성

나춘기,이무성,이인성,박희열,김옥배,Na, Choon-Ki,Lee, Mu-Seong,Lee, In-Sung,Park, Hee-Youl,Kim, Oak-Bae 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.1

The purpose of this study is to examine the feasibility of using stable isotopes as a hydrologic tracer, and to elucidate the groundwater circulation system and the source of S component dissolved in thermal water of the Chonju Jukrim thermal spring district based on the O, H and S isotopic variabilities of environmental materials including bedrock, rainwater, surface water, shallow subsurface water and thermal spring water. The ${\delta}^{18}O$ and ${\delta}D$ of subsurface waters and surface water show highly restricted range and plotted on the same meteoric water line as a ${\delta}D=8{\delta}^{18}O+19$ line, and derivate from the mean annual isotopic composition of the rain water but are analogous to those of rain waters precipitated during winter season, indicating that ground waters are originated from the meteoric water and are strongly affected by the seasonal variation of air mass. Thermal spring waters are more depleted in ${\delta}^{18}O$ and ${\delta}D$ than those of shallow ground water and surface water. It can be explained by the difference of recharge area. The hydrochemical properties of subsurface waters and surface water devide into two groups: $Ca(HCO_3)_2$ type including shallow subsurface water and surface water, and $Na(HCO_3)$ type of thermal spring waters. The ${\delta}^{34}S$ values of thermal spring water show very high positive and quitely distinct from those of shallow subsurface water and surface water that are similar to those of bed rocks, indicating that sulfate dissolved in thermal spring water has not only a terrigenic origin, but also originates partially from the foreign source containing very heavy ${\delta}^{34}S$ component such as an ancient sea water. However, the presence of $H_2S$ can not be ignore the affact of the isotopic fractionation to explaine the heavy ${\delta}^{34}S$ of thermal spring water. Overall, the Oxygen and Hydrogen stable isotopes can identify the source and the circulation system of the natural waters and the S-isotopes can provide a crucial clue on tracing the dissolved material transports in the circulation system of the natural water.

신보활석광산 주변에 형성된 우라늄 이상치가 지표수계 환경에 미치는 영향

나춘기,정재일 대한자원환경지질학회 2000 자원환경지질 Vol.33 No.4

In order to evaluate the environmental impact of U anormaly in the drainage system around the Shinbo talc mine area, U contents, their distribution patterns, bioaccumulation and a-radioactivity in stream water, stream sediments and aquatic organisms were investigated. The U contents of stream water attenuated with increasing distance from the mine area. The same attenuation pattern is shown in stream sediments from mine to 0.75 km downstream, although these contain highly enriched U contents (24~83 mg/kg) comparing with the international average concentration of surface soils (0.79~11 mg/kg). However, U content increases abruptly in sediment at 1.5 km downstream, probably due to detrital migration and rediposition of U enriched sediments. Futhermore, enriched U in downstream sediments occur in high proportions of carbonate and Fe-Mn oxide bounded forms, which show high potential of a secondary pollution source. For aquatic organisms, bio accumulation degree of U are in the order: aquatic larvae>black snail>mountain frog>crawfish. Cultured trout by the U enrich groundwater (387 ${\mu}g$/l) shows U accumulation in the part of branchia (CRs 5.25) and bones (CRs 11.2) but not in flesh (CRs 0.03). Total a-radioactivity have been measured in the level as 0.47 nCi/l for groundwater, 2.94~18 nCi/kg${\cdot}$DW for organisms and 93~328 nCi/kg${\cdot}$DW for sediments.

신보활석광산 주변에 형성된 우라늄 이상치에 관한 지화학적 연구 (II) -동위원소적 특성을 중심으로-

나춘기,박희열,박현주 대한자원환경지질학회 2000 자원환경지질 Vol.33 No.5

The purpose of this study is to elucidate the source of U anomaly formed in stream water of the drainage system around the Shinbo talc mine area based on the O, H, S and Sr isotopic characteristics of water masses and wall rocks. The ${\delta}$D and ${\delta}^{18}O$ of surface and ground waters show highly restricted range and plotted on the same meteoric water line, indicating that they are all originated from the meteoric water. The ${\delta}^{34}S$value of the ground water containing high U shows slightly negative (-0.2${\textperthousand}$) and quite distinct from those of the other surface and ground waters that are similar to those of wall rocks (>5.8${\textperthousand}$), indicating that they have a different S isotopic fractionation or less probably, source. The $^{87}Sr/^{86}{Sr}$ratios of water masses around the Shinbo talc mine area show a variable range from 0.724325 to 0.744928, but tend to increase with increasing U concentration of water mass. Although it is not possible to determine precisely the source rock of U anomaly formed in the hydrologic system around the Shinbo talc mine, the evidence obtained from the Sr isotopic compositions strongly suggests that coal schist and/or pegmatite vein could be the most likely candidate for the source rock.

모악 금·은광산에 방치된 폐석이 주변 수계 및 생태계에 미치는 환경적 영향

나춘기,전서령,Na, Choon-Ki,Jeon, Seo-Ryeong 대한자원환경지질학회 1995 자원환경지질 Vol.28 No.3

The heavy metal contents and their dispersion patterns in stream water, stream sediments, land plants and aquatic larvae collected from the hydrologic system flowing via the wasted ore dump of the Moak Au-Ag mine were investigated systematically in order to evaluate the environmental impacts of the abandoned metal mine. The heavy metal content increases abruptly in the vicinity of the wasted ore dump, then attenuated with increasing distance from the mine area. Attenuating rates were stream water > stream sediments > land plants > aquatic larvae. On the other hand, the cumulative content of heavy metals was stream sediments >aquatic larvae > land plants > stream water. Each element tends to be enriched selectively according to media; Zn > Cu > Cd > Pb in stream water, Zn > Pb > Cu > Cd in stream sediments and land plants, and Zn > Cu > Pb > Cd in aquatic larvae. These results show that the degree of enrichment and dispersion of pollutant extruded from the wasted ore dump are different according to elements and media, and that the circulation system of materials of each medium is different. The heavy metals, especially Cu, Pb and Zn, of polluted downstream sediments occur in high proportions of Fe-Mn oxides and organic bounded forms, which show high potential of a secondary pollution source. The content of heavy metals and their dispersion patterns in stream sediments are different from those of ten years ago; pollution levels of heavy metals were degraded in various ranges. The Zn and Cu-polluted areas were widened whereas Fe and Pb-polluted areas were reduced. In crops collected from the farm lands in downstream area, the pepper was more concentrated in all heavy metal than rice. The pepper showed some contaminated level in Cu(9.7ppm) and Zn(149ppm), and the rice in Zn(90ppm). However, both crops showed no significant level in Cd(<0.2ppm) and Pb(<0.5ppm).

폐금속광산 하부 농경지 토양의 중금속오염과 그 복구방법으로서 반전객토의 효율성

나춘기,이무성,정재일,Na, Choon-Ki,Lee, Mu-Seong,Chung, Jae-Il 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.2

In order to investigate the dispersion patterns and contamination level of heavy metals in the soil-ecosystem and to evaluate the efficiency of soil remediation by reversed soil method, soils and plants were collected from the Dongjin Au-Ag-Cu mine area and analysed for heavy metals. The dispersion patterns of heavy metals in soils and plants show that heavy metal pollutions caused by waste rump around Dongjin mine are mainly found in the vicinity of the waste rump and in the southward slanting of mine. Toxic metallic pollutants from the mine influence heavy metal contents in paddy soils in downstream area, and may be a potential sources of heavy metal pollution on crop plants. Soil samples collected from the remediated rice farming field by reversed method show similar levels of heavy metal content to those from the polluted rice farming field, but topsoil enrichment of heavy metals are not found. Heavy metal contents of the rice plants collected from remediated rice farming field are significantly lower than those from polluted rice farming field, and it suggests that the reversed soil method is effective for the reduction of bioavailability of heavy metals.

왕겨를 이용한 생체흡착제 제조: GMA공중합과 아민화를 통한 음이온 흡착관능기 도입

나춘기 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.7

This research investigated the feasibility of rice husk (RH) as a biosorbent for the removal of anions from aqueoussolution. RH-g-GMA-Am biosorbent, which possesses anionic exchangeable function, was prepared through graftpolymerization of glycidyl methacrylate (GMA) in the presence of N,N'-methylene-bis-acrylamide as a cross-linker usingpotassium peroxydisulphate as a redox initiator and subsequent amination reaction using ethylenediamine (EDA),diethylenetriamine (DETA), dimethylamine (DMA) and trimethylamine (TMA) as a amine source. Fourier transforminfrared (FTIR) and scanning electron microscopy (SEM) analysis as well as the sorption capacity for anions verifiedthe presence of grafted GMA polymers and amine groups on the RH surface. The zero point of surface potential ofaminated RH-g-GMA-Am sorbent was 6.4, which facilitated the sorption of anions on the positively charged sorbent atpH<6.4. The sorption capacity of RH-g-GMA-Am depending on the amination chemicals increased in the order:DETA≥EDA>DMA>TMA, i.e., primary amine>secondary amine>tertiary amine. The sorption selectivity of RH-g-GMA-Am sorbent aminated with DETA and EDA in the presence of equimolar anions and at pH 4.7 increased in theorder: SO4>PO4>NO3>F. Furthermore, their sorption capacities for PO4 were much higher than those of commercialanion-exchange resins. The results obtained suggest that the RH-g-GMA-Am biosorbent prepared by the GMA graftcopolymerization and subsequent amination can be used as an effective anion-exchanger comparable to commercial anion-exchange resins.

[열적처리분과] 열폭발법을 이용한 중,저준위 방사성폐기물의 유리화 : 방사성 핵종의 포집효율 및 유리고화체의 물성을 중심으로

나춘기,정일현,이만승,유병학,손창인 한국폐기물자원순환학회 2003 한국폐기물자원순환학회 학술대회 Vol.2003 No.1

하수고도처리의 탈인 흡착공정을 위한 인산이온 선택성 흡착제 개발

나춘기,박가연,송재준 한국폐기물자원순환학회 2018 한국폐기물자원순환학회 학술대회 Vol.2018 No.05

최근 환경기준이 강화되면서 하수 처리공정에서 생물학적 처리와 탈인시설을 조합한 하이브리드형 고도처리 공정이 빠르게 도입되고 있다. 현재 도입되고 있는 탈인시설은 대부분 응집제 투여를 바탕으로 하는 화학적 처리공정으로 비교적 처리공정과 유지관리가 간단하여 처리효율의 신뢰도가 높은 장점이 있는 반면에 화학약품 비용과 발생된 슬러지의 처분비용 등이 매우 높다는 단점이 있다. 이에 반해 하이브리드형 고도처리시스템을 구축하는데 있어 가장 단순하고 안정적인 단위공정의 하나로 알려진 흡착법은 이온성 물질의 동시제거가 가능하면서도 기후 및 농도에 관계없이 처리효율이 비교적 일정하고, 부생독성물질을 생성시킬 위험성이 없다는 장점을 가지고 있다. 그럼에도 불구하고 흡착법이 하수처리의 탈인공정으로 널리 활용되지 못하는 이유는 인산이온만을 선택적으로 흡착할 수 있는 흡착제가 없기 때문이다. 최근 저자들은 하수처리수를 이용한 컬럼실험을 통해 강염기성은 물론 약염기성 음이온교환수지 모두 하수 중에 다량 함유되어 있는 황산이온의 방해로 인산이온을 거의 흡착하지 못함을 확인하였다. 즉, 고정층 컬럼 실험을 통해 얻은 인산이온의 흡착량은 인산이온만 있을 경우 134 mg/g인데 반해 실폐수의 경우 Cl과 SO4이온의 흡착경쟁 때문에 10.4 mg/g으로 감소하여 실폐수 적용이 불가능하였다.

광양만권역의 토양오염 현황과 특성

나춘기 國立麗水大學校 環境問題硏究所 2011 環境硏究論文集 Vol.11 No.-