• Title/Summary/Keyword: 중금속

Search Result 3,655, Processing Time 0.106 seconds

Feasibility Test for Phytoremediation of Heavy Metals-Contaminated Soils using Various Stabilizers (중금속 오염토양에 대한 안정화 및 식물상 정화공법의 동시 적용연구)

  • Jeon, Jongwon;Bae, Bumhan;Kim, Younghun
    • Journal of the Korean GEO-environmental Society
    • /
    • v.13 no.3
    • /
    • pp.59-70
    • /
    • 2012
  • In this study, to select the best stabilizer for the heavy metals-contaminated soil from a smelter area during phytoremediation, a plant uptake experiment and a soil stabilization were simultaneously applied using Pteris multifida Poir. and five pre-screened stabilizers(zeolite, Mn dioxide, slag, Ca oxide, and magnetite). The extracted heavy metal was measured and compared using a 3 step sequential extraction for the soil samples. The growth rate of the plant was also evaluated. The stabilizers stabilized heavy metals in soil and reduced the extraction rate. Magnetite and calcium oxide showed better results than other stabilizers. The stabilizers enhanced the growth of the plant. All the heavy metals except for arsenic were concentrated in roots while arsenic was concentrated in leaves of the plant. It is concluded that the stabilizers can minimize the heavy metal release from the contaminated soil during phytoremediation and stimulated the growth of plant. These effects of stabilizers could compensate for some weak points of phytoremediation such as reaching of heavy metals by rainwater.

Heavy Metal Contents In Tissues of Carassius auratus In Andong and Imha Reservoir (안동.임하호에 서식하는 붕어(Carassius auratus) 조직 내 중금속 함량)

  • Kim, Jeong-Sook;Shin, Myung-Ja;Lee, Jong-Eun;Seo, Eul-Won
    • Journal of Life Science
    • /
    • v.19 no.11
    • /
    • pp.1562-1567
    • /
    • 2009
  • Heavy metal contamination levels in Andong reservoir and Imha reservoir were measured with heavy metal contents in both water and sediment, and analyzed with heavy metal accumulation level in inhabitant fish, Carassius auratus, using an inductively coupled plasma spectrometer and an atomic absorption spectrometer. High levels of heavy metal contents in water, sediment and the tissues of C. auratus were detected. Likewise, relatively high levels of As were detected in water and sediment from Andong reservoir. In addition, higher levels of Cr, Cu, Cd and As content were detected in muscle and bone tissues of fish from Andong reservoir than those from Imha reservoir. As a result, the heavy metal content of water, sediment and inhabitant fish, C. auratus, in Andong reservoir was higher than Imha reservoir. We proposed that heavy metal contamination in water and inhabitant fish is attributed to various metals derived from abandoned mines and farmlands that are upstream of Andong reservoir.

A Geo-statistical Assessment of Heavy Metal Pollution in the Soil Around a Ship Building Yard in Busan, Korea (통계지표를 활용한 부산지역 조선소 주변 토양 내 중금속 오염조사 연구)

  • Choi, Jung-Sik;Jeon, Soo kyung
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.24 no.7
    • /
    • pp.907-915
    • /
    • 2018
  • With the increase of metal usage in various industries, metal pollution and ecological toxicity in the environmental system have become a significant concern. A geo-statistical index has been widely used to determine contamination level with normalization through a background value. In this study, geo-statistical indexes such as an enrichment factor, accumulation index, and potential ecological risk index were used to assess metal pollution in soil at locations associated with shipbuilding manufacturing industries. Metal contamination, especially of Cu and Pb, was observed in some samples located closer to manufacturing sites. Enrichment factor and accumulation (IGEO) values were indicative of concerning levels of soil contamination in specific samples, and the soil contamination could be induced by anthropogenic sources. In further study, after more detailed sampling for soil and potential pollution sources, high interpretation techniques such as Pb isotope analysis and X-ray analysis will be needed to investigate source identification.

Plant Growth-promoting Bacteria for Remediation of Heavy Metal Contaminated Soil: Characteristics, Application and Prospects (중금속 오염 토양 정화를 위한 식물생장촉진세균: 특성, 활용 및 전망)

  • Cho, Kyung-Suk
    • Microbiology and Biotechnology Letters
    • /
    • v.48 no.4
    • /
    • pp.399-422
    • /
    • 2020
  • Remediating soils contaminated with heavy metals due to urbanization and industrialization is very important not only for human health but also for ecosystem sustainability. Of the available remediation technologies for heavy metal-contaminated soils, phytoremediation is a relatively low-cost environment-friendly technology which preserves biodiversity and soil fertility. The application of plant growth-promoting bacteria (PGPB) during the phytoremediation of heavy metal-contaminated soils can enhance plant growth against heavy metal toxicity and increase heavy metal removal efficiency. In this study, the sources of heavy metals that have adverse effects on microorganisms, plants, and humans, and the plant growth-promoting traits of PGPB are addressed and the research trends of PGPB-assisted phytoremediation over the last 10 years are summarized. In addition, the effects of environmental factors and PGPB inoculation methods on the performance of PGPB-assisted phytoremediation are discussed. For the innovation of PGPB-assisted phytoremediation, it is necessary to understand the behavior of PGPB and the interactions among plant, PGPB, and indigenous microorganisms in the field.

Examining the Interrelation of Total, Soluble, and Bioavailable Metals in the Sediments of Urban Artificial Lakes (도심인공호 퇴적물의 총중금속, 용존중금속, 생물이용성 중금속의 연관성 규명)

  • Baek, Yong-Wook;An, Youn-Joo
    • Korean Journal of Ecology and Environment
    • /
    • v.41 no.1
    • /
    • pp.66-72
    • /
    • 2008
  • Total metals, soluble metals, and bioavailable metals were monitored at the sediments of urban lakes located in Seoul, Korea during spring season 2006. The metals measured were zinc, arsenic, chromium, copper, nickel, and cadmium, which are known to be toxic to human health and ecosystems. The main sources of heavy metals in the lakes were urban runoff and atmospheric deposition associated with air pollution in urban areas. Extraction by using a weak electrolyte solution (0.1 M $Ca(NO_3)_2$) was used to predict bioavailability of the metals. Among the six heavy metals studied, copper was the most bioavailable, based the weak electrolyte extraction techniques. Since metal toxicity is related to metal bioavailability, the results were consistent with the high ecotoxicity of copper, compared to other heavy metals. Overall results suggest that there was no direct relationship between total and bioavailable metal concentration, although zinc, copper and cadmium show some relationships.

A study of Immobilizing Heavy metals by pellets manufactured from Coal tailings and Iron oxide (선탄경석(選炭硬石)과 광산화물(鑛酸化物)로 제조(製造)한 담체(擔體)의 중금속(重金屬) 불용화(不溶化) 특성연구(特性硏究))

  • Lee, Gye-Seung;Song, Young-Jun
    • Resources Recycling
    • /
    • v.21 no.1
    • /
    • pp.75-81
    • /
    • 2012
  • Porous pellets for immobilizing heavy metals were manufactured from coal tailings and iron oxide powder. Coal tailings was pulverized and mixed with iron oxide powder. The mixed powder was granulated into spherical pellets and roasted. Over $1100^{\circ}C$, residual coal in coal tailings reduced iron oxide to ZVI(Zero-Valent Iron). The pellets have 34.63% of porosity, 1.31 g/mL of bulk density, and 9.82.urn median pore diameter. The pellets were reacted with synthetic solutions containing each heavy metals: arsenic(V), copper(II), chrome(VI), and cadmium(II), respectively. On the test of immobilizing heavy metal, the pellets made at $1100^{\circ}C$ were superior to the other pellets made under $1000^{\circ}C$. Immobilizing over 99.9% of 10ppm heavy metal solutions required I hour for arsenic, 2 hours for chrome, and 4 hours for copper. However, immobilizing capacity of cadmium was inferior to that of the other metals and it was decreased in reversely proportion to initial concentration of the solutions.

Detection of Heavy Metal Ions by the Cuvette Assay Measuring Urease Inhibitory Activity (Urease 저해활성 측정 cuvette assay에 의한 중금속 이온 검출)

  • Kim, Dong-Kyung;Park, Kyung-Rim;Kang, Eun-Mi;Park, In-Seon;Kim, Nam-Soo
    • Applied Biological Chemistry
    • /
    • v.46 no.2
    • /
    • pp.74-78
    • /
    • 2003
  • To determine the urease inhibitory activity of various heavy metal ions, a photometric cuvette assay for measuring ammonia production was developed. In this assay, the absorbance values at 630 m were linearly increased according to the ammonia concentrations up to 3.0 mg/l (r : 0.998). The urease inhibitions upon addition of a single species of heavy metal ions were in the decreasing order of Hg(II) > Pb(II) > Cu(II) > Cd(II) > Zn(II) ions. As expected, the urease inhibitions at a fixed concentration of a single species and at varying concentrations of other species occurred in the additive way. The above results show the applicability of the current method to the selective detection on Hg(II) ions as well as the screening of heavy metal ions possibly present at various samples.

Effect of Temperature and pH on the Biosorption of Heavy Metals by Exophiala sp. (Exophiala sp.의 중금속 흡착에 미치는 온도 및 pH의 영향)

  • Lim, Joung-Soo;Lee, So-Jin;Lee, Eun-Young
    • Microbiology and Biotechnology Letters
    • /
    • v.36 no.2
    • /
    • pp.165-172
    • /
    • 2008
  • To find the optimum growth and metal removal condition of isolated strain LH2, effects of the environmental factors such as medium pH, growth temperature, and metal concentrations were investigated. Based on the 18S rDNA analysis, the isolated strain was identified to Exophiala sp. with 100% homology. Isolated strain Exophiala sp. LH2 showed maximum removal efficiency of metals at the shaking conditions of pH 7 and $25^{\circ}C$. When the concentration of metal was under 200ppm, the specific metal removal velocity at pH 7 increased from 0.01 to 4.43 mg-metal $L^{-1}{\cdot}d^{-1}{\cdot}mg{\cdot}DCW^{-1}$ as the concentration of metal increased from 10 ppm to 200 ppm. When 200 ppm of each metal was contained in the culture medium adjusted with pH 7, metal removal efficiencies Cr, Cu, Ni, Pb and Zn were 99.28%, 97.67%, 91.94%, 99.77%, 99.61%, respectively.

Applicability of Permittivity Measurement Method for Investigating the Heavy Metal Contamination of Subsurface (지반의 중금속 오염도 조사를 위한 흙의 유전상수 측정기법의 적용성 평가)

  • Oh, Myoung-Hak;Kim, Yong-Sung;Yoo, Dong-Ju;Park, Jun-Boum
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • /
    • pp.499-506
    • /
    • 2005
  • 지반오염조사에 대한 유전상수 측정기법의 적용성을 평가하기 위하여 중금속 오염도에 따른 흙의 유전특성 변화를 분석하였다. 유전상수의 실수부와 허수부 모두 체적함수비에 따른 증가경향을 나타내었으며, 특히 MHz 범위에서 유전상수 실수부는 쌍극자모멘트에 비례하기 때문에 흙의 유전상수는 체적함수비에 따른 선형적인 증가경향을 나타내었다. 중금속 용액은 50kHz 이하의 저주파영역에서 전극 분극효과에 의해 농도 증가에 따라 유전상수 실수부가 증가하는 경향을 나타내었으나, 고주파 영역에서는 이온의 수화작용에 의한 물분자의 배향분극 발현 감소로 인하여 유전상수 실수부가 감소하였다. 유전상수 허수부의 경우에는 모든 주파수 영역에서 중금속 농도 증가에 따른 전도손실에 의하여 증가하는 경향을 나타내었다. 흙과 중금속 혼합시료의 경우 함수비가 큰 시료에서는 중금속 용액 자체의 유전특성이 그대로 발현되었으나, 함수비가 작은 시료에서는 공간전하분극의 영향이 우세하여 유전상수 실수부가 10-20%정도 증가하는 경향을 나타내었다. 유전상수 허수부의 경우에는 중금속 농도 증가에 따른 뚜렷한 증가경향을 확인할 수 있었다. 본 연구의 결과에 의하면 중금속의 오염감지에 대해서는 유전상수 실수부보다는 허수부의 적용성이 높은 것으로 나타났으며, 현장에서의 정확한 오염도 평가를 위해서는 함수비에 대한 평가가 선행되어야 할 것으로 판단된다.

  • PDF

Convergence Process for the Removal of Heavy Metals in the Abandoned Mine (휴폐광산의 중금속제어를 위한 융합공정 개발)

  • Dho, Hyonseung
    • Journal of the Korea Convergence Society
    • /
    • v.7 no.1
    • /
    • pp.155-160
    • /
    • 2016
  • The convergence process utilized both leaching and ion exchange techniques has been investigated for the heavy metals removal in the abandoned mine of Chungyang Province, Korea. The contaminated soil samples by heavy metals from Samkwang mine were analysed by statistical analyses. The highly contaminated soils was initially separated by the flotation process. The selectivity indices were increased with increasing flotation reagents. The selectivity of separation was then improved by the use of both leaching and ion exchange processes in order to extract the heavy metals. The results of this study showed that the higher the sulfuric acid concentration, the leaching rate of heavy metals was increased. The lecheate then was removed by the ion exchange method. The anticipating results might imply that convergence process utilized both leaching and ion exchange techniques would somehow apply for the removal of heavy metals in the abandoned mine.