• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.61-62
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• 2006

• Korean Journal of Food Science and Technology
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• v.31 no.3
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• pp.569-574
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• 1999

One hundred and ninety seven corn samples, which collected from each local province in Korea between 1995 and 1996, were analyzed for fumonisin $B_1\;(FB_1)$ and $B_2\;(FB_2)$ contamination using fluometric HPLC. $FB_1$ and $FB_2$ were detected in 143 (72.6%) and 128 (62.4%) samples from 197 samples at the concentrations ranging from 0 to $224.2\;{\mu}g/g$ for $FB_1$ and from 0 to $60.0\;{\mu}g/g$ for $FB_2$, respectively. The total fumonisin levels analyzed from 143 samples were 15.4, 37.5 and 14% for concentrations below $10\;{\mu}g/g$, above $10\;{\mu}g/g$ and above $30\;{\mu}g/g$, respectively. The total fumonisin levels containing above $10\;{\mu}g/g$ were detected the highest concentration with 53.2% in samples collected from Kangwon, and followed by Kyeongki (45.0%), Cheonbuk (40.0%), Chungbuk (26.9%) and Kyeongbuk (11.1%). The total fumonisin level containing above $10\;{\mu}g/g$ in samples collected in 1996 was higher than that in 1995. Both fumonisin $B_1$ and $B_2$ from samples collected in 1995 were detected higher than that in 1996 and $FB_1$ was detected the highest level in samples collected from Kyeongki province and followed by Kangwon, Cheonbuk, Chungbuk and Kyeogbuk (11.1%). Also, similar results were observed in $FB_2$.

• The Korean Journal of Ecology
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• v.27 no.3
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• pp.141-146
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• 2004

This paper reports on Pb and Cd concentrations in the tissues of 76 individuals of 16 rare bird species found dead across Korea. In most of species, Pb concentration was higher in kidney and bone than in liver. The range of the mean liver Pb was 0.47 (Cygnus cygnus)∼3.74 ㎍/wet g (Asio flammeus). Based on hepatic Pb concentrations, 39 (51.3%) of the 76 individuals were classifed as background level (〈2㎍/wet g), 35 (46.1%) were elevated level (〉2㎍/wet g) and 2 (2.6%) were poisoned level (〉10㎍/wet g). These results were indicated many rare birds were suffered from chronic Pb exposure. Cd concentration was generally higher in kidney than in liver and bone. The range of the mean kidney Cd was 0.06 (Bubo bubo)∼l.75㎍/wet g (falco subbuteo). Only one of the 76 individuals had elevated Cd concentration (〉2.7㎍/wet g) in kidney. These results indicated most of rare birds had low Cd accumulations.

• Journal of Soil and Groundwater Environment
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• v.12 no.6
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• pp.78-91
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• 2007

The groundwater chemistry is heavily influenced by land use. This study has investigated the groundwater quality and contamination characteristic associated with land use. Contamination index ($C_d$) was estimated for evaluating and areal distribution of groundwater contamination degree. Groundwater samples collected from 216 locations in the study area show great variability in chemical composition. Electrical conductance ranges from 100 to $31,360\;{\mu}S/cm$. The pH values are between 4.6 (acidic) and 8.57 (weak alkaline). The water types predominantly represent the $Ca-HCO_3$ and $Ca-Na-HCO_3$ types, whereas, in the residential and business areas, the water type is shifted to (Na, Ca)-Cl type with rich concentration of Cl. The $C_d$ values of the study area range from 1.1 to 117.6 with a mean of 9.56.

• Korean Journal of Food Science and Technology
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• v.19 no.6
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• pp.543-549
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• 1987

This study was carried out to estimate the change of Hg content in contaminated food materials including rice grain, soybean sprouts and crucian carp during their washing and cooking processes. The residue level of Hg in contaminated rice at 1 ppm level was decreased to the extent of 24% by three-times washing whereas it was not decreased in cooking. The removal efficiency of Hg in soybean sprouts contaminated at 80 ppm level was about 26% in three-times washing. While the Hg content was not decreased in blanching or cooking of soybean sprouts as a whole, the extent of leached Hg into the fluid part varied in the range of 23-41% depending on the heating time, salinity and volume of cooking water. While the Hg content in fish contaminated at 1 ppm level was not decreased in cooking as a whole, the leaching ratio of Hg into the fluid part was in the range of 2-10% depending on the salinity of cooking water. Disposal of inedible portion in cooked fish could remove 32% of contaminated Hg residue.

• Journal of Korea Water Resources Association
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• v.36 no.4
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• pp.575-586
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• 2003

In case of continuous input of a pollutant, dispersion characteristics do not change much with changing dispersion coefficient, but that of an instantaneous input is very sensitive to the changes of dispersion coefficient. The characteristics of behavior of instantaneous input of a pollutant at the downstream of Han river were analyzed in this paper Field measurement of hydraulic and water quality factors at the downstream of Han river were conducted at low flow condition. The hydraulic factors were used to estimate the longitudinal dispersion coefficient, and the reasonable empirical equations for longitudinal dispersion coefficient at the downstream of Han river were suggested. The measured concentrations of BOD were closely matched with the calculated ones from RMA-4 model. In case of instantaneous input, range of dispersion, transport pathway and the traveltimes of the first and maximum concentration with variation of the longitudinal dispersion coefficients and water levels of downstream boundary were evaluated in this paper.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.3
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• pp.208-216
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• 2009

This study was performed to investigate levels of POPs in soil by land use and identify congener profiles of PCBs, PCDD/Fs in soil in Korea. Heptachlor, Aldrin, Endrin, Mirex, Toxaphene were not found in all areas. The concentrations of Diedrin, Chlordane, ${\Sigma}$DDT, HCB in soil samples were in ranged from N.D. to 12.08 ${\mu}g$/kg, from N.D. to 16.08 ${\mu}g$/kg, from N.D. to 38.19 ${\mu}g$/kg and from N.D. to 1.32 ${\mu}g$/kg. In case of PCBs, concentration were in ranged from N.D. to 172.12 ${\mu}g$/kg, and PCBs contaminated area was higher than other areas. The concentrations of PCDD/Fs were in ranged from 0 to 6.68 pg I-TEQ/g. In addition, the ${\Sigma}$PCDFs concentration in the industry area soil was higher than ${\Sigma}$PCDDs.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.05a
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• pp.12-16
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• 1997

폐금속 광산 주변 및 광산 하부 농경지 토양에 대한 중금속 오염원으로서 폐금속 광산 주변에 방치된 폐석의 영향을 고찰하고 오염토양에 대한 복구방법으로서 반전객토의 효율성을 검토하기 위하여 동진 금·은·동 광산 주변토양과 하부 농경지 중 오염된 논, 객토된 논 및 오염되지 않은 논을 선정하여 각각의 토양과 변에서 보여지는 금속원소의 함량과 분포특성을 비교·고찰한 결과, 동진광산에 주변에 방치된 폐석은 폐광된지 30여년이 지난 지금에도 주변토양 및 수계 하부의 농경지에 강한 중금속 오염원으로 작용하고 있음을 보여 이들의 광해를 방지하기 위해 적절한 복구대책이 필요한 것으로 판명되었다. 오염토양의 복구법으로서 반전객토지에서 산출된 나락의 중금속 함량(Cd 0.015ppm, Cr 0.07ppm, Cu 0.567ppm)은 비객토 오염지(Cd 0.096-0.215ppm, Cr 0.195-0.275ppm, Cu 1.085-1.151ppm)에 비해 대부분의 원소에서 2배 이상 낮은 값을 보이고 있어 농작물에의 중금속 전이를 억제하는 데는 상당히 효율적임을 시사했다. 이러한 결과는, 단순히 토양의 물리성 개선 및 이에 따른 토양환경의 변화 등에 의한 일시적 효과일 수 있음을 배제할 수 없지만, 적어도 반전객토법이 토질개선 방법 중 가장 간편하고 오염된 토양부분의 배출토에 대한 처리문제 및 이로 인한 이차오염문제 등을 고려하지 않아도 된다는 점을 감안할 때 소규모 금속광산 주변으로 비교적 오염정도가 약한 토양을 정화법으로 이용될 수 있음을 시사한다.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.10
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• pp.1046-1054
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• 2006

The raw water DOC contained 39.3% of hydrophilics, 42.9% of hydriophobic, and 17.8% of transphilic. The hydrophobic fraction in this raw water was mostly fulvic acid. Fulvic acid comprised of 62% and the rest was humic acid(38%). There was more carboxylic acid functional group(64%) than phenolic group(36%). HPI-N and HPI-C comprised of 17% and 22% in the hydrophilic portion, respectively. The fouling mechanisms on the membrane surface and into its porous structure were analyzed in terms of several kinetic models. In order to analyze the fouling kinetics, the various kinetic models described in this paper were used to fit the experimental results. The kinetic models and kinetic constants obtained for each operation condition. The permeate flux was rapidly declined by simultaneous pore blocking and cake formation. Also, the permeate flux declined with decreasing internal pore size resulted from organic deposition into the membrane pore. The results of the membrane fouling test using UF membrane according to NOM fractions. HPI-N caused more fouling than HPI-C. Humic acid caused more fouling than fulvic acid probably due to higher adsorption capacity. Since humic acid has higher adsorption capacity than fulvic acid, it would be more adsorbed onto the membrane pores.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.206-206
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• 2020

토지이용의 고도화에 따라 비점오염원 부하는 증가하는 추세이며 기후변화에 따른 강우강도 증가 등으로 지표면에 축적된 고농도의 비점오염물질이 하천으로 유출, 수질오염을 가중시키고 있어 비점오염원 관리가 필요하다. 환경부에서 효율적인 비점오염원 관리를 위하여 2004년부터 현재까지 3단계에 걸쳐 비점오염원 관리 종합대책을 수행하고 있으며, 2008년부터 비점국고보조사업을 추진하여 비점오염저감시설 설치를 통한 수질개선 및 수생태계 건강성 확보에 기여하고자 하였다. 이에 본 연구는 비점국고보고사업을 통해 구축된 비점오염저감시설을 대상으로 시설 설치 및 운영 현황과 강우시 비점오염저감 효과 분석을 통한 시설의 평가를 수행하고자 한다. 연구대상시설은 시범시설 및 국고보조시설 총 70개소로 2005~2017년에 준공되었으며, 2016년부터 현재까지 총 4년동안 진행된 모니터링을 바탕으로 연구를 수행하였다. 시설의 용량은 34~97,000㎥의 범위로 SA/CA 1.2~6.6%의 범위이다. 강우시 모니터링은 선행무강우일수 3일이상을 고려하여 수행하였으며 도시지역의 경우 5mm 이상, 농촌지역 10mm 이상시 모니터링을 진행하였다. 시설의 유입과 유출부에서 수질 및 유량 모니터링을 진행하였으며, 수질오염공정시험법에 준하여 BOD, COD, SS, T-N 및 T-P 항목에 대해 분석을 수행하였다. 모니터링 결과, 국내 비점오염저감시설의 평균 부하량은 SS 250.4 kg/day, BOD 89.2 kg/day, COD 136.2 kg/day, TN 51.4 kg/day, TP 7.1 kg/day 로 분석되었으며, 유출부 의 경우 SS 83.8 kg/day, BOD 37.2 kg/day, COD 51.0 kg/day, TN 15.4 kg/day, TP 2.0 kg/day로 나타났다. 또한, 은 오염물질 유입 및 유출 부하량의 상관관계 분석결과 SS, BOD, COD의 유입 및 유출 부하량의 상관성은 높게 나타났으며 특히 유기물질(BOD, COD)의 상관성은 0.8이상으로 분석되었다(p<0.005). 이는 비점오염저감시설에 적용된 식생, 미생물, 여재 등을 통하여 물리학적 및 생태학적 처리를 통해 저감되기 때문으로 판단된다. 하지만, TN은 인위적 요인과 자연적 요인이 복합적으로 작용으로 배출 특성으로 상관성은 매우 낮은 것으로 분석되었다.