• 제목/요약/키워드: CD71

검색결과 196건 처리시간 0.023초

경산지역 토양 및 수질오염에 관한 연구 (A Study of Soil and Water Pollutions in Kyungsan Province)

  • 김용태;이부용;김동석;양소영;이동훈;박병윤
    • 한국환경과학회지
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    • 제11권7호
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    • pp.713-720
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    • 2002
  • In order to provide the basic information on the environmental pollution of Kyungsan province, the contents of Pb, Cd, Cr, Cu, Mn and Zn in soil, stream water, aquatic sediment and groundwater were investigated, and also the values of pH, COD, $KMnO_4-C$,\;NH_3-N,\;NO_2-N,\;NO_3-N$ and $Cl^-$ of stream water and groundwater were determined. The results were as follows. The values of COD, $NH_3-N,\;NO_2-N$ and $NO_3-N$ of the stream waters were very low. The contents of Pb, Cd, Cr, Cu and Zn in the stream waters were respectively at range of $0.014~0.063 mg/{\ell},\;0.004~0.007 mg/{\ell$\mid$, 0~0.045 mg/{\ell},\;0~0.008 mg/{\ell}$\;and\;$0.001~0.175 mg/{\ell}$, and these values were much lower than those of contaminated stream water in Korea. The contents of Cd, Cr, Cu and Zn in the soils were respectively at range of 0.12~O.71 ppm, 0.88~2.65 ppm, 2.86~22.33 ppm and 3.89~26.39 ppm, and these values were much lower than those of ordinary polluted areas in Korea. The contents of Cd, Cr, Cu, As, Zn and Mn in the aquatic sediments were respectively at range of 3.05~3.81 ppm, 14.6~70.6 ppm, 13.74~61.59 ppm, 76.8~465.5 ppm, 12.56~190.83 ppm and 333.3~l188.3 ppm. The values of pH, $KMnO_4-C,\;NH_3-N$, and $NO_3-N$ of the groundwaters were respectively at range of 7.6~8.4, $0~3.95{\ell}$, 0.05~0.15 mg/{\ell}$ and 0.05~0.42 $mg/{\ell}$. The contents of Pb, Cd and Cr in the groundwaters were respectively at range of 0.015~0.061 $mg/{\ell}$, 0.O06~0.009 $mg/{\ell}$ and 0.005~0.045 $mg/{\ell}$.

The Behaviors of Trace Metals (Fe, Mn, Co, Cu, Cd, Zn and Pb) in the Han River Estuary, Korea

  • Lee, Chang-Bok;Choi, Man-Sik
    • Journal of the korean society of oceanography
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    • 제36권3호
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    • pp.59-71
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    • 2001
  • In order to investigate the temporal variability of dissolved and particulate trace metals in the Han River, water samples were collected intermittently at two sites for 3 years (August 91 to December 94). Surface seawaters covering the range of salinity were also collected at the estuarine region to evaluate the role of estuary for the riverine fluxes of trace metals within the estuary during October 95 and 96. During the study period, dissolved metal concentrations in riverwaters varied by a factor of 5-10 for Fe, Ni, Co and Cu and 50-100 for Mn, Cd and Pb depending upon the water level; high concentration during the low water and low concentration in high water period except for Fe. The concentration of dissolved Fe increased with increasing water discharge. These concentration-discharge relationships of the studied trace metals are explained by the successive dilution of waters from two different origins, which can be presumably identified as anthropogenic discharges and watershed flushing. Although estuarine waters at early mixing region were not collected due to the difficulty of sampling, mixing behaviors of metals were inferred from the concentration-salinity relationships through the laboratory mixing experiment and field sampling, and distribution coefficients between dissolved and labile particulate phases. It is suggested that the Han River estuary plays a role of accumulating Fe, Mn, Co and Pb from riverine sources due to high turbidity caused by strong tidal current, whereas this system serves as a source of dissolved Cd due to release caused by extended residence time of riverine particles.

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Preparation and characterization of green adsorbent from waste glass and its application for the removal of heavy metals from well water

  • Rashed, M. Nageeb;Gad, A.A.;AbdEldaiem, A.M.
    • Advances in environmental research
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    • 제7권1호
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    • pp.53-71
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    • 2018
  • Waste glass disposal causes environmental problems in the cities. To find a suitable green environmental solution for this problem low cost adsorbent in this study was prepared from waste glass. An effective new green adsorbent was synthesized by hydrothermal treatment of waste glass (WG), followed by acidic activation of its surface by HCl (WGP). The prepared adsorbent was characterized by scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), and BET surface measurement. The developed adsorbent was used for the removal of heavy metals (Cd, Cu, Fe, Pb and Zn) from well water. Batch experiments were conducted to test the ability of the prepared adsorbent for the removal of Cd, Cu, Fe, Pb and Zn from well water. The experiments of the heavy metals adsorption by adsorbent (WGP) were performed at different metal ion concentrations, solution pH, adsorbent dosage and contact time. The Langmuir and Freundlich adsorption isotherms and kinetic models were used to verify the adsorption performance. The results indicated high removal efficiencies (99-100%) for all the studied heavy metals at pH 7 at constant contact time of 2 h. The data obtained from adsorption isotherms of metal ions at different time fitted well to linear form of the Langmuir sorption equation, and pseudo-second-order kinetic model. Application of the resulted conditions on well water demonstrated that the modified waste glass adsorbent successfully adsorbed heavy metals (Cd, Cu, Fe, Pb and Zn) from well water.

CD-ROM 드라이브의 대물렌즈 입자오염이 레이저 다이오드 파워와 포토 다이오드 RF 신호에 미치는 영향 (Effect of Particle Contamination of Objective Lens in a CD-ROM Drive on Laser Diode Power and Photo Diode RE Signal)

  • 배양일;이재호;황정호
    • 대한기계학회논문집B
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    • 제28권1호
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    • pp.66-71
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    • 2004
  • Airborne contaminant particles are intruded into optical disk drive(ODD) due to the flow caused by disk rotation and can be adhered to objective lens, which causes read/write errors. Such a phenomenon can be a serious problem for high-density storage devices. The purpose of this paper is to understand the effect of particle contamination of objective lens in a CD-ROM drive on laser diode power and photo diode RF signal. The measurements of laser power and readout RF signal were carried out by using a laser power meter and a time interval analyzer, respectively. The parameters for estimating a readout-signal' distortion were its jitter and amplitude. Alumina(Al$_2$O$_3$) particles were used as test dust particles. The results show that the failure for data access happened as the degree of lens contamination was greater than 20%.

Low Cholesterol Mozzarella Cheese Obtained from Homogenized and β-Cyclodextrin-Treated Milk

  • Kwak, H.S.;Nam, C.G.;Ahn, J.
    • Asian-Australasian Journal of Animal Sciences
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    • 제14권2호
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    • pp.268-275
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    • 2001
  • The effects of homogenization conditions and $\beta$-cyclodextrin ($\beta$-CD) on cholesterol removal of Mozzarella cheese were examined. The homogenization pressure influenced markedly on the cholesterol removal in milk and, 75.64% of cholesterol, the highest rate, was removed at $70.0kg/cm^2$. In addition, an increase in temperature resulted in an increase of cholesterol removal in the range of 71.75 to 78.22%. Among different concentrations of $\beta$-CD addition, 1.0% showed 78.21% of cholesterol removal. Therefore, cholesterol-reduced Mozzarella cheese was made by cheese milk treated with 70 $70.0kg/cm^2$ homogenization at $70^{\circ}C$ and 1% $\beta$-CD addition for a subsequent study. The cholesterol reduction of cholesterol-reduced Mozzarella cheese was 63.92%. Meltability, stretchability and oiling-off in cholesterol-reduced cheese were significantly lower than those in control. Hardness, gumminess and chewiness were significantly reduced, while cohesiveness and elasticity increased. Appearance and flavor of the cheese were superior, but texture inferior to the control.

대구·울산지역의 토양 중금속 오염도 평가 (Heavy Metal Concentrations in Soils of the Daegu and Ulsan Area)

  • 이태관
    • 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.

청소년 후기 말기 암 환자의 정서적.영적 돌봄을 위한 의미요법 CD 프로그램 개발 (Development of a CD Program Applied Logotherapy for Psycho.Spiritual Care of Late Adolescents with Terminal Cancer)

  • 강경아;김신정;송미경
    • Journal of Hospice and Palliative Care
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    • 제12권2호
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    • pp.61-71
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    • 2009
  • 목적: 본 연구는 청소년 후기 말기 암 환자의 전반적인 경험을 이해하고 총체적인 고통을 경감하도록 돕는 정서적, 영적 돌봄 프로그램인 CD 프로그램을 개발하기 위한 것이다. 방법: 2006년 11월 1일부터 2007년 10월 30일까지 Keller와 Song의 ARCS이론과 Kang의 멀티미디어 코스웨어 설계 과정을 응용하여 플래쉬 도구를 활용한 CD 프로그램을 개발하였으며, 개발된 의미요법 프로그램명은 "청소년 후기 암 환자를 위한 "내 삶의 보물찾기""이었다. 프로그램 개발은 <계획>, <설계>, <개발>-CD프로그램, 사용자(간호사)용 교육지침서 및 학습자용 교육용 책자, <평가>의 4단계를 통해 이루어졌다. 결과: 본 연구에서 개발된 의미요법 CD 프로그램은 총 5개의 비밀을 찾는 과정으로 교육시간은 각 차시별로 $15{\sim}20$분으로 구성되었으며. "비밀"로 명명된 각 차시별 구성은 의미요법에 대한 프로그램의 제작목적을 알려주는 <처음>과 6컷 만화를 통한 동기유발을 유도하기 위한 <마음열기>, 각 차시별 교육목적과 의미요법 교육이 진행되는 영상물 상영 <알아보기>, 교육 내용에 대한 카타르시스를 위한 <웃음 송>, 교육내용을 자신에게 직접 적용해 보는 <경험하기>, 메인화면으로 돌아갈 수 있는 <끝>의 6단계로 이루어졌으며, 교육용 소책자(의미노트)를 제공하여 반복학습이 이루어질 수 있도록 하였다. 본 프로그램은 청소년 말기 암환자가 있는 임상현장인 병원학교 혹은 지역사회 어느 곳이든지 컴퓨터가 가능한 곳에서는 사용할 수 있도록 CD로 만들어졌으며, 프로그램은 신규 간호사도 사용하기 편리하게 자동과 수동 양방향의 기능을 가지고 매체조작이 용이하도록 제작되었다. 교육지침서는 전체 내용을 손쉽게 파악할 수 있도록 되어 있고, <웃음 송>에 대한 저작권 등록은 완료된 상태로 전국의 소아 청소년 종양병동에서 무료로 사용할 수 있도록 하였다. 결론: 본 프로그램은 간호사들이 교육에 대한 큰 부담없이 의미요법 프로그램을 쉽게 진행할 수 있도록 제작되어 있어 임상에서 청소년 후기 말기 암 환자의 정서적, 영적 간호중재 방법으로 유용하다고 판단된다. 또한 말기 암환자 뿐 아니라 청소년 후기에 만성 및 불치의 질병으로 고통을 받는 대상자에게도 적용할 수 있다고 생각된다.

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부산 일부지역 토양과 농작물의 중금속 함량에 관한 연구

  • 정갑섭;이남걸
    • 한국환경과학회:학술대회논문집
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    • 한국환경과학회 2006년도 추계 학술발표회 발표논문집
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    • pp.475-478
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    • 2006
  • 부산 일부지역 토양의 중금속 오염과 농작물로의 전이에 의한 중금속 오염을 측정하고자 산분해에 의한 함량분석을 실험하였다. 대상지역 토양의 pH는 $5.62{\sim}6.71$의 범위였으며, 평균 중금속 함량은 $0.05{\sim}19.39ppm$의 범위에서 Mn(13.82ppm)>Zn(8.33ppm)>Pb(2.89ppm)>Cu(0.99ppm)>Cd (0.07ppm)의 분포로 나타났고, 조사대상 중금속의 토양중의 함량은 모두 Clarke수보다 작은 값으로 측정되어 오염도가 낮은 상태였다. 농작물에는 Cd(0.04ppm)$Pb\;6.6%{\sim}Zn\;87.6%$의 범위였다.

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정천탕의 알러지에 대한 실험적 연구 (The Experimental study of Jungchun-tang on Allergies)

  • Chang-Gue Son;In-Chan Seol
    • 대한한의학회지
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    • 제24권3호
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    • pp.65-71
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    • 2003
  • 목적 : 정천탕(定喘湯, JCT)이 IgE/mast cell로 유포되는 천식(喘息)등의 알러지성 질환에 대한 효과를 실험적으로 검증하고자 하였다. 방법 : IgE의 혈중농도와(in vivo) 분비 량을 측정하였으며(in vitro), 알러지 관련 유전자의 발현을 RT-PCR로 검색하였고, JCT의 수용성 복합 추출물이 compound 48/80로 유발되는 mast cell line(IC-2)의 histamine의 방출에 미치는 직접적인 영향을 측정하였다(in vitro). 결과 : 정천탕은 ovalbumin으로 유발시킨 마우스의 혈중 IgE량과 IL-4와 CD-40로 유도시킨 spleen B 임파구의 IgE 생성량도 현저하게 감소시켰다. 또한 INF-r의 발현은 증가시킨 반면, IL-4와 IL-6의 발현과 mast cell의 histamine 방출은 억제하는 것으로 나타났다. 결론 : 정천탕의 항알러지 효과를 실험적으로 확인 할 수 있었으며 임상적으로는 천식등 알러지성 질환에 사용 할 수 있을 것으로 사료된다.

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전북지역 강과 저수지에 서식하는 붕어의 중금숙 함량에 관하여 (A Study on the Contents of Heavy Metals in Carassis auratus of River and Reservoir on Cheonbuk Area)

  • 김인숙;한성희
    • 한국식품영양과학회지
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    • 제28권1호
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    • pp.22-27
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    • 1999
  • This study was performed to investigated the contamination levels of harmful heavy metals were sampled from Aug. 1 to Aug. 31, 1997, at 9 areas in Cheonbuk area. The heavy metal contents were determinated by ICPS(Inductively Coupled Plasma Spectrometer) method. The levels of total lead, cadmium, aluminum, iron and copper were determined and the results were summarized as follows: The minimum and maximum values(ppm) of 9 areas of Carassius auratus were Pb: 2.03~6.19, Cd: 0.06~ 0.76, Al: 8.84~23.5, Zn: 10.68~48.71, Cu: 0.60~1.51ppm. Among the five heavy metals contents, the highest was zinc and the lowest was cadmium. The results showed that the contents of Pb, Cd, Al, Zn and Cu in Carassius auratus were lower than the FAO/WHO maximum allowance.

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