• Asian-Australasian Journal of Animal Sciences
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• 제14권3호
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• pp.395-401
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• 2001

A review of present understanding of the dietary nutrient utilization in ruminant animals is presented. For increasing the utilization of dietary nutrients and reducing environmental contamination, highlighting the development and use of nutritional manipulation technique is suggested.

• 한국지반공학회논문집
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• 제24권5호
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• pp.15-25
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• 2008

본 논문에서 매년 항만개발 및 항로유지의 목적으로 발생하는 준설토사의 유효활용을 위하여 주요 항만 준설토사에 대하여 오염현황을 조사 및 분석하였다. 그리고 준설물질별 인간의 건강에 대한 피해확률을 과학적으로 추정하는 위해성 평가를 실시하여 공업 및 주거지역에서 직접 인체에 대하여 안전하고 유효하게 활용할 수 있는 기준을 제시하였다. 제시한 기준은 기존의 준설토사 처리.활용기준 및 토양환경보전법상의 환경기준보다 엄격한 것으로 나타났다. 그리고 유효활용에 대한 사전평가를 실시할 수 있는 관련 기준을 근거로 국내 주요항만의 발생준설토사에 대한 오염도를 평가한 결과, 일부 항만에서 카드뮴(Cd), 비소(As), 크롬(Cr) 및 아연(Zn)이 환경기준을 초과하는 것으로 나타나 정밀한 조사가 이루어져야 할 것으로 나타났지만 대부분 항만에서 발생한 준설토사는 유효활용이 가능한 것으로 나타났다.

• 한국환경독성학회:학술대회논문집
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• 한국환경독성학회 2003년도 추계국제학술대회
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• pp.169-169
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• 2003

In Korea, there is no CRA studies and has not well known CRA and not well established their methodologies. Therefore, objectives of this study is to establish the framework of CRA consisting of health risk, economic risk and perceived risk and the detail methodologies of three main component of estimating and comparing those risks for on the three environmental problems of air pollution, indoor air pollution and drinking water contamination which being subjective to the eight sub-problems of hazardous ai. pollutants (HAPs), regulated pollutants (representative as PM10) and Dioxins (PCDDS/ PCDFs) in air pollution, and indoor ai. pollutants (IAPs) and Radon in indoor air pollution, and drinking water pollutants (DWPs), disinfection-by- products(DBPs) and radionuclides in drinking water contamination in Seoul, Korea. And then, their problems set priorities by individual and integrated risk. As a results, ranking of health risk were the following order of indoor air pollution, air pollution and then drinking water contamination, in three environmental problems and of radon, PM10, IAPs, HAPs, DWPs, Dioxins, DBPs, and then radionuclides in eight sub-problems. And that of economic risk were the same order. In the contrary, ranking of perceived risk were the following order of air pollution, drinking water contamination, and then indoor air pollution, and of HAPs, Dioxins, radionuclides, PM10, DWPs, IAPs, Radon and then DBPs.

• 한국지구과학회지
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• 제42권4호
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• pp.412-424
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• 2021

Understanding the distribution of heavy metals in sediment is necessary because labile heavy metals can partition into the water column and bioaccumulate in aquatic organisms. Here we investigated six heavy metals (Co, Cu, Mn, Ni, Pb, and Zn) in sediment cores using a five-step sequential leaching method to examine the occurrence of heavy metals in the sediment. The results showed that all elements, except Mn, are depleted in the exchangeable and carbonate fractions. However, heavy metal concentrations are much higher in the Fe-Mn oxide and organic matter fractions, especially for Cu, indicating enrichment in the organic matter fraction. Furthermore, contamination parameters (contamination factor and geoaccumulation index) indicate that Mn contamination is high, primarily derived from anthropogenic sources, presenting a potential risk to ecosystems in the Nakdong River.

• 한국환경과학회지
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• 제7권4호
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• pp.565-572
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• 1998

This study estimate the degree of contamination in the streamwater around the Sudokwon landfill site. It was sampled at 10 sites in Jan., Apr., Jul. and Oct., 1996. There were analyzed five kinds of toxic chemical material-CN, AES, PCB, As, Org-p, and four kinds of heavy metal-Pb, Hg, Cd, $C^{+6}$ The result are 1)The COD was generally increased to compare before landfall, 2) The Org-P and PCB were not detected at all points, 3) The concentrations of Pb, $C^{+6}$ and As were lower than the environmental criteria values, 4) The CN, Hg and Cd were over envirommental criteria values. and so emergent regulation is needed, 5) The effects of the streamwater contamination were not only the leachate of the landfall, but also the small factories and agricultural land around the landfill.

• 한국환경보건학회지
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• 제1권1호
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• pp.36-40
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• 1974

A Study on environmental sanitation on the well in Seoul was made to find the degree of Physio-chemical and Bacterial contamination. For this study 30 wells were located at Nokbundong Hongjaidong and Hongeundong from September 13 to 22 1971. As the results of this study the following conclusions were obtained. 1) Seventy per cent were being utilizing by from 10 to 50 households per well. 2) About 93 per cent of the wells were found to be dug out in Rocks. 3) Eighty-three per cent of the wells surveyed in the slums had a depth of water shorter than 20 cm. 4) The degree of Total Viable Bacteria contamination were high point $15{\times}10^2$ low point 13 and coliform bacteria were high point $79{\times}10^1$ low point 1 organism per ml. 5) Only 4 wells (13.3%) were able to drink but 26 wells (86.7%) were not drinking by physio-chemical and Bacterial contamination.

• 한국환경과학회지
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• 제14권6호
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• pp.605-611
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• 2005

The aim of this study was to analyze the local distribution of the heavy metal concentration in Daegu and Ulsan which were divided into the residual areas, the traffic dense areas and the industrial areas. The Inductively Coupled Plasma(ICP) was used to analyze heavy metals, such as As, Cr, Hg, Zn, Cd, Pb, Cu and minor metals, such as Fe, Si, Mg, Ca, AI, Na, K. The results of this analysis showed that the content of heavy metals which was classified by districts in Daegu and Ulsan was the highest in the industrial areas followed by the traffic dense areas and the residual areas. Compared to the level of heavy metals of national and local soil survey network in 2003, contamination of heavy metals in Daegu was lower than national average. However, the content of Cd, As, Zn in Ulsan was respectively 13.38 times, 472 times and 2.65 times higher than national average contamination. In addition, compared to the soil pollution level of the environmental protection law, contamination of all areas in Daegu was lower. But the content of As at the industrial areas in Ulsan was 10.71 times higher than standard of soil pollution and 4.28 times higher than standard of measures against soil contamination.

• 환경영향평가
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• 제22권5호
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• pp.481-489
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• 2013

There are U.S. troops with a force about 290,000 strong stationed all around the world, approximately 150 countries. Among the troops, USFK has performed principal part with its stationing for 50 years against the military threat of North Korea. However, as a result of an investigation made into environmental contamination of several bases which were restituted from US to ROK by the Land Partnership Plan in the process of relocation of USFK, it was found that the area was contaminated by not only TPH and BTEX caused by diesel fuel and JP-8 but also various heavy metal over the standard level according to the operations of corps. Among these bases, 4 corps, each of which has different duties and function, were chosen to be analyzed for the characteristics and degrees of soil contamination. Fisrt of all, in armored camp the soil was contaminated by TPH and heavy metal (Zn, Ni, Pb) due to the repairing activities of tracked vehicles and shooting exercises. In army aviation camp, the soil was contaminated by TPH, BTEX and heavy metal (Zn, Cd) due to repairing activities of aircrafts. Also, in engineer camp there was contaminated area polluted by TPH and heavy metal (Zn, Pb) caused by open-air storage of various construction materials and TPH, BTEX and heavy metal (Zn, Pb, Cu) contamination of aircraft shooting area in shooting range camp were detected. Managing environment will be more effective when we identify the contaminative characteristics and take necessary measures in advance.

• 한국환경보건학회지
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• 제32권1호
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• pp.46-52
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• 2006

Results for the concentrations of total polychlorinated biphenyls (total PCBs) and the PCB profile with different types of leaves from four coniferous trees (pine needles) at the same sampling site are presented. Concentrations of total PCBs detected in pine needles were very similar among them regardless of their different types of leaves, which means a possibility for bio-monitoring regional contamination of PCBs. Correlation coefficients(r) of PCB congeners between pine needles were very significant (r>0.97, p<0.001), which showed that PCB congener's patterns of each pine needle were similar. Profiles of PCBs detected in pine needles showed correlation with gaseous phase PCBs in air, otherwise not with particle phase PCBs in air. Therefore, it was estimated that dry gaseous deposition was a principal pathway of PCBs accumulation in pine needles. In addition, although we analyse a different types of leaves in pine needles at the same region, they can be used to identify regional contamination patterns of PCBs for larger regions.

• 한국환경보건학회지
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• 제39권5호
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• pp.426-437
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• 2013

Objective: Gotjawal refers to a special geographical designation found in Jeju Province, Korea, where vegetation forms over a rocky area. Due to the important ecological value of Gotjawal, international concern about such areas is growing. However, only limited information is available regarding environmental contamination of Gotjawal. This study was conducted in order to investigate the levels of contamination and associated ecotoxicological effects of surface water bodies in Gotjawal. Methods: Surface water samples were collected at three sampling sites in two Gotjawal areas and were analyzed for several pharmaceuticals and pesticides in consideration of the potential sources of contamination. The ecotoxicity of the samples was measured using water fleas (Daphnia magna and Moina macrocopa) and zebrafish (Danio rerio). In addition, effects on the gene transcription of zebrafish were investigated following exposure to the samples. Results: Nine pharmaceuticals were detected in the samples, but none of the target pesticides were detected. Following acute exposure to two surface water samples, the survival of waterfleas was significantly reduced, but reproduction was not affected. In zebrafish, time-to-hatch was delayed and fry survival was decreased in some samples. On the other hand, at the transcriptional level, there were no genes significantly influenced by exposure to the samples. Conclusion: This is the first study investigating environmental contamination in Gotjawal areas and associated ecotoxicities. Further studies are warranted to identify the cause of acute Daphnia toxicity and to determine potential consequences of longer-term exposure in Gotjawal areas.