• Title/Summary/Keyword: 이온범위

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Simultaneous Separation Analysis of Some Metal Ions in Piperidinedothiocarbamate Chelates by Reversed-Phase Liquid Chromatography (역상 액체 크로마토그래피에 의한 몇가지 금속 이온들의 Piperidinedithiocarbamate 킬레이트 동시분리분석)

  • Lee, Won;Bahng, Seung-Hoon;Kim, Mi-Kyoung
    • Analytical Science and Technology
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    • v.13 no.1
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    • pp.27-33
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    • 2000
  • Simultaneous separation and analysis of Ni(II), Pd(II), Co(II), Cu(II) and Hg(II) in peperidinedithiocarbamate (PDTC) chelates were investigated by reversed phase liquid chromatography. The optimum conditions for the separation of PDTC metal chelates were examined with respect to the pH, extraction solvent, and mobile phase strength on Novapak $C_{18}$ column using methanol/water mixture as mobile phase. All metal PDTC chelates were eluted in an acceptable range of capacity factor value ($0{\leq}log\;k^{\prime}{\leq}1$). The linear calibration curves were obtained in the concentration range of $0{\sim}1.2{\mu}g/mL$ for five metal ions, and also good precision in the range of 1.96~3.41% RSD was obseved. Under the optimum conditions, trace metat ions in the composite water sample were successfully separated and determined with relative error of ${\pm}2.0%$.

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Bromide Concentration in Human Biological Samples Intoxicated by Methylbromide (Methylbromide에 중독된 인체시료 중 브롬이온의 함량)

  • You, Jae-Hoon;Lee, Sang-Ki;Jin, Kwang-Ho;In, Sang-Wban;Yoo, Young-Chan;Park, Sung-Woo
    • Analytical Science and Technology
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    • v.11 no.2
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    • pp.88-91
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    • 1998
  • Bromide($Br^-$) was separated and quantified with $2.8mM-NaHCO_3/2.2mM-Na_2CO_3$ by Ion Chromatography. Bromide was eluted at 8.9 min. and the detectetion limit was 2.5 ng. We compared with bromide concentration in normal or methylbromide intoxicated bloods and tissues. Bromide concentrations were 2.0~5.8 ppm in normal bloods and 1.0~5.3 ppm in normal tissues. In fatal cases of methylbromide intoxication, blood bromide concentrations (4 cases) of 74.2~139 ppm and tissue bromide concentration (1 case) of 76 (heart)~201 (lung) ppm were detected. In fatal cases, blood bromide concentrations. were 12~22 times higher than those of normal bloods.

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Spectrofluorimetric Determination of Pb ion in Aqueous Media Using an Optical Sensor (광센서를 이용한 수용액 중 납이온의 형광분광법적 정량)

  • Lee, Sang Hak;Seo, Hyo Suk
    • Journal of the Korean Chemical Society
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    • v.46 no.5
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    • pp.407-411
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    • 2002
  • A method to determine lead ion in aqueous media using an optical sensor loaded on a fluorescent optode membrane incoporating a metal ion-selective ionophore, a proton-selective chromoionophore and lipophilic anionic sites has been studied. The effects of pH and thickness of membrane on the fluorescence intensity were investigated. The effects of foreign ions such as $Na^+$, $K^+$, $Mn^{2+}$ and $Zn^{2+}$ on the determination of lead ion were also studied. The linear range in the calibration curve for the determination of lead ion was found to be 5.0${\times}10^-7$ to 5.0${\times}$$10^-3$M and the correlation coefficient in this range was -0.99107 under the optimal experimental conditions. The relative standard deviation of the blank signals was 3.0% and the detection limit of lead ion was 5.0${\times}$$10^-9$M.

The Extraction of Palladium by Polyurethane Foam impregnated with ${\beta}$-Diphenylglyoxime (${\beta}$-디페닐글리옥심으로 침윤시킨 폴리우레탄 포움에 의한 팔라듐의 추출)

  • Sam Woo Kang;Seung Seok Lee
    • Journal of the Korean Chemical Society
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    • v.27 no.4
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    • pp.268-272
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    • 1983
  • Polyurethane foam impregnated with ${\beta}$-diphenylglyoxime has been applied to the extraction of palladium(II) from platinum(IV) and nickel(II) in aqueous solution. Palladium(II) is quantitatively extracted from $0.01{sim}0.05M$ HCl. On the other hand, platinum(Ⅳ) was slightly extracted and nickel(II) was not found to be extraction in the same experimental condition. Based on the results obtained, the selective separation, removal and recovery of Pd(II) from Pt(IV) or Ni(II) was possible by batch or elution method.

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$Co{^2+}$ 이온으로 오염된 토양에 대한 EDTA 존재 하에서 pH변화에 따른 탈착반응 연구

  • 권회삼;원휘준;안병길;김계남;이병직;오원진;이계호
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05b
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    • pp.808-813
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    • 1998
  • EDTA 의 농도 및 온도가 일정한 조건에서 수용액의 pH 를 변화시켜 가며, 토양으로부터 Co$^2$$^{+}$ 이온의 탈착특성을 살펴보았다. 실험범위에서, pH 4 일 때 $CO_2$$^{+}$ 이온의 탈착율이 가장 양호하였으며, pH 가 상승함에 따라 탈착율이 감소되는 것으로 나타났다. 또한, 반응중 철 성분이 용해되어 나오는데 이는 반응 초기 수소이온에 의한 용해와 반응중 탈착된 Co$^2$$^{+}$ 이온에 의한 용해로 설명하였다.

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Thermal Effusion of Implanted Inert Gas Ions from Si(100) (Si(100)에 주입된 불활성 기체 이온들의 방출 특성)

  • Jo Sam K.
    • Journal of the Korean Vacuum Society
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    • v.15 no.1
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    • pp.73-80
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    • 2006
  • Thermally-driven effusion of inert gases out from Si(100), into which energetic $\~l keV\;He^+,\;Ne^+,\;A^r+,\;and\;Kr^+ ions$ had been implanted at a moderate substrate temperatures of $\~400 K$, was investigated by means of temperature-programmed desorption (TPD) mass spectrometry. While He effused out broadly over $500\~1,100 K$, Ne, Ar, and Kr effusion occurred sharply at 810, 860, and 875 K, respectively. Hydrogen adsorption/desorption analysis for the ion-treated Si(100) surfaces indicated minimal to severe damage by ions with increasing mass from He to Kr. Implications of these results in light of literature reports are discussed.

저에너지 광이온선(Broad Ion Beam)을 이용한 건식식각 및 박막증착

  • Sim, Gyu-Hwan;Choi, Young-Kyu;Yang, Jeon-Wook;Kang, Jin-Young
    • ETRI Journal
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    • v.13 no.2
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    • pp.91-98
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    • 1991
  • 저에너지 광이온선 (broad ion beam) 을 이용한 건식식각과 박막증착에 있어서 이온선 및 증착의 조건들에 따른 영향을 살펴보았다. 저에너지 광이온선은 화합물반도체 공정 및 고융점금속의 증착, optical coating, cosputter 에 의한 초전도물질합성 등 사용범위가 넓다. 단일이온선증착과 cosputter 의 경우에 근사수식과 실험치로서 증착비 및 막의 균일도를 최적화하는 target, 웨이퍼, 이온원 사이의 기계적 설계에 대해 고찰하였다. 저에너지 이온선의 이온과 target 원자 그리고 스퍼터된 이온과 시편원자와의 물리적, 화학적 반응기구는 반응성 이온과 보조 이온선 등의 다양한 기술에 응용될 수 있을 것으로 기대된다.

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Temperature-Dependent Spin Densities in a-Ge : H (a-Ge:H에서의 스핀밀도의 온도의존성)

  • 이정근
    • Journal of the Korean Vacuum Society
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    • v.3 no.2
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    • pp.234-238
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    • 1994
  • 전자스핀 공명(ESR)으로 측정된 수소화된 비정질 게르마늄(a-Ge:H)의 D-센터에 대한 스핀밀도 의 온도의존성이 77∼350K의 온도범위에서 보고된다. a-Ge:H의 D-센터에 대하여 이 온도범위에서 온 도가 증가함에 따라스핀밀도의 감소가 관측되었으며, 그 결과는 전자상관에너지와 열적이온화효과에 근 거하는 결함 모델들의 예상치와 비교되었다. a-Ge:H에서의 스핀밀도의 감소는 전자상관에너지 모델로서 는 이해될수 없었고 상온에서의 결함계의 열적 이온화에 기인할 수 있는 것으로 생각된다.

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The Mixed-Bed Ion Exchange Performance and Temperature Effects at Ultra-Low Concentrations - 2.Temperature Effects - (초저이온 농도범위에서 혼합층 이온교환능과 온도의 영향 - 2. 온도의 영향 -)

  • Yoon, Tae Kyung;Noh, Byeong Il;Lee, Chang Won;Moon, Byung Hyun;Lee, Gang Choon;Jo, Myung Chan
    • Applied Chemistry for Engineering
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    • v.10 no.2
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    • pp.206-211
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    • 1999
  • Mixed-bed ion exchange performance was studied experimentally with variations of cation to anion resin ratio, resin weight and temperature at ultralow sodium chloride solution concentrations of less than $1.0{\times}10^{-4}M$. Analyzing the effluent concentration histories the performance test was examined as a function of tested solution volume for a laboratory-scale continuous flow column until both the cation and anion-exchange resins were exhausted. Initial leakage was observed for both cation and anion breakthrough curves, but serious at cation breakthrough curve because of low selectivity coefficient. The slope of breakthrough curve was affected by selectivity coefficient and temperature. The slope of anion breakthrough curve was steep because of the large selectivity coefficient, and ion exchange rates increased as temperature increased. The temperature effect decreased as the total volume was increased or as the resins were exhausted.

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