• Title/Summary/Keyword: NiCd

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A study on the removal of mixed heavy metal ions using crab shell (게 껍질을 이용한 수중의 복합 중금속 제거에 관한 연구)

  • Kim, Dong-Seog
    • Journal of Environmental Science International
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    • v.11 no.7
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    • pp.729-735
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    • 2002
  • In order to examine the inhibition effect of other heavy metal ions on the removal of heavy metal ions by crab shell in aqueous solution, 10 heavy metal ions $(Cr^{3+},\;Cd^{2+},\;Ni^{2+},\;Zn^{2+},\;Hg^{2+},\;Cu^{2+},\;Mn^{2+],\;Fe^{2+},\;Fe^{3+},\;Pb^{2+})$ were used as single heavy metal ions and mixed heavy metal ions, respectively. In single heavy metal ions, $Pb^{2+},\;Cr^{3+},\;Cu^{2+}$ were well removed by crab shell, however, $Cd^{2+},\;Ni^{2+},\;Zn^{2+},\;Mn^{2+}$ were not. The heavy metal removal increased as the increase of covalent index (Xm$^2$r), and the relationship classified heavy metal ions as 2 heavy metal groups $(Fe^{3+},\;Fe^{2+},\;Cu^{2+},\; Cr^{3+},\;Mn^{2+},\;Ni^{2+},\;Zn^{2+}\;group\;and\;Pb^{2+},\;Hg^{2+},\;Cd^{2+}\;group)$. In mixed heavy metal ions, the removals of $Fe^{2+},\;Fe^{3+},\;Pb^{2+},\;Cu^{2+}$ as 0.49 m㏖/g, regardless of the existence of other heavy metal ions, were similar to the result of single heavy metal ions experiment. The removals of $Mn^{2+},\;Cd^{2+},\;Ni^{2+}$ decreased as the existence of other heavy metal ions, however, the removal of $Zn^{2+},\;Cr^{3+},\;Hg^{2+}$ increased.

Investigation of Heavy Metal Concentrations in Paddy Soils of Gyeongnam Province (경남지역 논토양의 중금속함량 조사)

  • Lee, Young-Han;Sonn, Yeon-Kyu;Ok, Yong-Sik
    • Korean Journal of Soil Science and Fertilizer
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    • v.45 no.3
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    • pp.399-403
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    • 2012
  • The management of heavy metals in soil is important for environmental-friendly agriculture and keeping an ecosystem healthy. In this study, we examined the concentrations of heavy metals (Cd, Cr, Cu, Ni, Pb, Zn, and As) in 260 paddy soils sampled from Gyeongnam Province. The concentrations of the heavy metals were 0.143 mg $kg^{-1}$ (ranged 0.003-0.537) for Cd, 0.322 (0.002-0.986) mg $kg^{-1}$ for Cr, 25.41 (6.03-76.19) mg $kg^{-1}$ for Cu, 16.36 (2.63-32.94) mg $kg^{-1}$ for Ni, 18.67 (4.16-87.02) mg $kg^{-1}$ for Pb, 71.76 (22.99-153.58) mg $kg^{-1}$ for Zn, and 3.516 (0.002-19.481) mg $kg^{-1}$ for As, respectively. In addition, the concentration of Cd was highest in mountain foot-slope, Ni and As were highest in diluvial terrace, and Zn was highest in marine plains. Higher concentrations of Cd, Cu, and Zn were found in silty clay loam soils compared to silt loam, sandy loam, and loam soils.

Correlation of Heavy Metal Concentrations between Total Digestion and Aqua Regia Digestion for Sediments from Yeongsan and Seomjin Watersheds (완전분해와 전분해 방법에 의한 영산강.섬진강수계 퇴적물의 중금속농도 상관관계)

  • Oh, Da-Yeon;Choi, Kyoung-Kyoon;Huh, In-Ae;Hwang, In-Seong;Kim, Young-Hoon;Hur, Jin;Shin, Hyun-Sang;Oh, Jeong-Eun;Shin, Won-Sik;Park, Jeong-Hun
    • Journal of Korean Society of Environmental Engineers
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    • v.33 no.1
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    • pp.32-38
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    • 2011
  • In this study, the correlations of concentrations in sediment heavy metals between two pretreatment methods, total digestion and aqua regia digestion, have been investigated. Total 43 samples had been collected from streams and lakes in Yeongsan and Seomjin watersheds. They were decomposed in two pretreatment methods and five metal components (Cd, Cr, Ni, Pb, Zn) were analyzed. Overall average concentrations of heavy metals were Zn>Cr>Pb>Ni>Cd in the order. The concentrations of aqua regia digestion were 35.0% (Cd), 53.8% (Cr), 66.2% (Ni), 64.4% (Pb) and 76.4% (Zn) of the concentrations of total digestion and heavy metal concentrations of total digestion were higher. Heavy metal concentrations in sediments from lakes were higher than those from streams. The correlation equations between the concentrations of total digestion and aqua regia digestion were obtained. The concentrations of Zn and Ni, which showed strong linear correlations, increased in aqua regia digestion as the concentration in total digestion increased. The linear correlation coefficients between two digestion methods for most analyzed metals were above the average correlation. However, these results can be applied with limitations due to heterogeneity of sediments.

Comparison of Image Quality and Effective Dose by Additional Filtration on Digital Chest Tomosynthesis (Digital Chest Tomosynthesis에서 부가필터에 따른 화질 및 유효선량)

  • Kim, Kye-Sun;Kim, Sungchul
    • Journal of radiological science and technology
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    • v.38 no.4
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    • pp.347-353
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    • 2015
  • The purpose of this study is to suggest proper additional filtration by comparisons patient dose and image quality among additional filters in digital chest tomosynthesis (DTS). We measured the effective dose, dose area product (DAP) by changing thickness of Cu, Al and Ni filter to compare image quality by CD curve and SNR, CNR. Cu, Al and Ni exposure dose were similar thickness 0.3 mm, 3 mm and 0.3 mm respectively. The exposure dose using filter was decreased average about 33.1% than non filter. The DAP value of 0.3 mm Ni were decreased 72.9% compared to non filter and the lowest dose among 3 filter. The effective dose of 0.3 mm Ni were decreased 48% compared to 0.102 mSv effective dose of non filter. At the result of comparison of image quality through CD curve there were similar aspect graph among Cu, Al and Ni. SNR was decreased average 19.07%, CNR was average decreased 18.17% using 3 filters. In conclusion, Ni filtration was considered to be most suitable when considered comprehensive thickness, character, sort of filter, dose reduction and image quality evaluation in DTS.

Study on Heavy Metal Contents in Air of Den Tal Laboratories and Urine of Dental Laboratory Technicians in CHONBUK Area (전북지방 치과기공실 공기중 및 치과기공사의 뇨중중금속 함량에 관한 연구)

  • 이정오;이종섭;유인수
    • Journal of Environmental Health Sciences
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    • v.16 no.2
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    • pp.97-103
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    • 1990
  • For this study, I used the urine of 100 dental laboratroy technicians and 24 students in Chonbuk region. The purposes of this study were to investigate concentrations of cadmium (Cd), nickel (Ni) and chromium (Cr) in the air of dental laboratories. The results were as follows: 1. The concentrations of Cd is 0.0115mg/m$^{3}$ in the porcelain part, 0.0090mg/m$^{3}$ in the polishing part, that of Ni is 0.2864mg/m$^{3}$ in the porcelain part, 0.3188mg/m$^{3}$ in the polishing part, that of Cr is 0.0448mg/m$^{3}$ in the porcelain part, 0.1032mg/m$^{3}$ in the polishing part. 2. The concentrations of Cd, Ni and Cr in the technicians urine are 3.06 $\mu$g/l, 44.55 $\mu$g/l and 14.58 $\mu$g/l. Those of students, urine as the control group are 1.93 $\mu$g/l, 19.05 $\mu$g/l and 7.48 $\mu$g/l. There is significant difference between experimental group and control group (P < 0.01). 3. Watching for age and working place, 31-40 years age group reveals the highest group in the concentrations of Cd. Over 41 year age group represents the highest group in the concentrations of Ni and Cr (P < 0.01) The concentration of Cd turns up the highest in the partial part and that of Ni and Cr appears the highest in the polishing part (P < 0.01). Looking into working age, over 7 year group is the highest group in the concentrations of all investigated (P < 0.05).

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Stabilization of mixed heavy metals in contaminated marine sediment using steel slag (제강슬래그를 이용한 해양오염퇴적물 내 혼합 중금속 안정화)

  • Shin, Woo-Seok;Kim, Young-Kee
    • Journal of Navigation and Port Research
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    • v.38 no.3
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    • pp.269-275
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    • 2014
  • In this study, the adsorption efficiency of mixed heavy metals in aqueous solution was investigated using steel slag. Moreover, heavy-metal stabilization treatment of contaminated marine sediment was achieved using steel slag as stabilizing agents. Heavy metal adsorption was characterized using Freundlich and Langmuir equations. The equilibrium adsorption data were fitted well to the Langmuir model in steel slag. The adsorption uptake of heavy metals were higher in the order of $Pb^{2+}$ > $Cd^{2+}$ > $Cu^{2+}$ > $Zn^{2+}$ > $Ni^{2+}$. The steel slage was applied for a wet-curing duration of 150 days. From the sequential extraction results, the exchangeable, carbonate, and oxides fractions of Ni, Zn, Cu, Pb, and Cd in sediment decreased by 13.0%, 6.0%, 1.3%, 17.0%, and 50.0%, respectively.

Heavy Metal Distributions of Soils in the Vicinity of Shi-Hwa Industrial Complex Region (시화공업단지 주변지역 토양의 중금속 분포)

  • 송영배;이상모
    • Journal of Soil and Groundwater Environment
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    • v.8 no.2
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    • pp.87-91
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    • 2003
  • This study was carried out to investigate the heavy metal distributions of soils in the vicinity of Shi-Hwa industrial complex region, where the air pollutants from industrial area could affect the soil environment of near residential and green areas. The ranges of contents of As, Cd, Co, Cr, Cu, Hg, Ni, Pb and Zn in soils were 0.58~3.81, ND~0.91, 0.15~6.33, ND~l.86, 0.14~110.27, ND~l.17, 0.04~10.59, 1.16~86.48 and 1.83~212.65 mg/kg, respectively. For all industrial, residential and green areas, the heavy metal contents were much lower than the standard of Korean Soil Environmental Preservation Act or the critical concentration which phytotoxicity is considered to be possible. Mean values of contents of As were similar in industrial, residential and green areas. However, the mean values of contents of Cd and Cr in industrial area were higher 10 and 5 times than those in residential and green area, respectively. And also the mean values of contents of Co, Cu, Hg, Ni, Pb and Zn in industrial area were higher 2~3 times than those in residential and green area.

Adsorption Effect of Heavy Metals (Zn, Ni, Cd, Cu) in Aqueous Solution Using Bottom Ash of Biomass Power Plant (바이오매스 발전소 저회를 활용한 수용액 내 중금속(Zn, Ni, Cd, Cu) 흡착 효과)

  • So-Hui Kim;Seung-Gyu Lee;Jin-Ju Yun;Jae-Hyuk Park;Se-Won Kang;Ju-Sik Cho
    • Korean Journal of Environmental Agriculture
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    • v.41 no.4
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    • pp.252-260
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    • 2022
  • BACKGROUND: The number of biomass power plants is increasing around the world and the amount of wastes from power plants is expected to increase. But the bottom ash (BA) is not recycled and has been dumped in landfill. This study was conducted to find out functional groups of BA and adsorption rate of heavy metals on BA. METHODS AND RESULTS: The BA was dried in oven at 105℃ for 24 hours, and characterized by analyzing the chemistry, functional group, and surface area. The adsorption rates of heavy metals on BA were evaluated by different concentration, time, and pH. As a result, the adsorption amount of the heavy metals was high in the order of Zn> Cu> Cd> Ni and the removal rates of Zn, Cu, Cd, and Ni by BA was 49.75, 30.20, 32.46, and 36.10%, respectively. Also, the maximum adsorption capacity of BA was different by the heavy metal in the environmental conditions, and it was suggested that the isotherms for Zn, Ni, Cd, and Cu were adequate to Langmuir model. CONCLUSION(S): It is suggested that it would be effective to remove heavy metals in aqueous solution by using BA from biomass power plants in South Korea.

Heavy Metal Accumulation in Wild Plants on the Roadside of Industrial Areas (공장지역 도로변 야생식물들의 중금속 축적)

  • Choi, Yun Jeang;Lee, Jong Suk
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.8 no.5
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    • pp.39-46
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    • 2005
  • This study was conducted to investigate the heavy metal accumulation in wild plants. The samples from 5 plant species on 14 sites were taken on the roadside where urban and industrial regions in northern Gyeonggi do. Artemisia princeps var. orientalis, Chenopodium album L. var. centrobrum, Erigeron canadensis L., Rumex crispus L. and Taraxacum platycapum H. Dahlst were taken from different parts of the plants gathered in surveyed sites for analysing. This study classified which species were suitable to accumulators, excluders, or indicators which were provided as Phytoremediation for heavy metals(Cd, Cr, Ni, Pb and Zn) and considered the applicability of that work. 1. The mean accumulation of 6 heavy metals in plants was as follows; Zn> Cu> Cr> Pb> Ni> Cd in rows except for Ni and Pb in Erigeron. 2. The highest heavy metal accumulators were Taraxacum and Artemisia. 3. The comparison of heavy metal accumulations between the tops and roots in the plants was as follows; Zn> Cd> Pb> Ni> Cu> Cr. 4. Comparison of heavy metal accumulations between tops and roots, root parts were higher than the top parts in most of the plants. Especially, in Taraxacum, a ratio was over 1.0 in Cr, Ni, and Zn. Therefore, Taraxacum was an accumulator for 3 heavy metals. And Erigeron, Chenopodium, Rumex, Artemisia were good for excluders which had lower than 1.0.

Adsorption and Separation of Ag(I) Using a Merrifield Resin Bound NTOE, NDOE in Aqueous Solution (수용액에서 NTOE, NDOE가 결합된 Merrifield 수지를 이용한 Ag(I)의 흡착 및 분리 특성)

  • Lee, Cheal-Gyu;Kim, Hae Joong
    • Analytical Science and Technology
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    • v.12 no.2
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    • pp.159-165
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    • 1999
  • The adsorption and separation behaviors of transition metal ions using a merrifield resin bound 1,12-diaza-3,4:9,10-dibenzo-5,8-dioxacyclopentadecane (NTOE) and 1,12,15-triaza-3,4:9,10-dibenzo-5,8-dioxacycloheptadecane(NDOE) were investigated in aqueous solution. The orders of adsorption degree(E) and distribution ratio(D) of transition metal ions were Cu(II)$t_R$) of metal ions were affected by adsorption degree(E) and distribution ratio(D). This results showed good separation efficiency of Ag(I) from mixed metal solution.

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