• Title/Summary/Keyword: Ion extraction

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Simultaneous Analysis of Semi-Volatile Organic Acid Priority Pollutants in Soil (토양 중의 비휘발성 산성 유기 Priority Pollutants 동시분석에 관한 연구)

  • Lee, Seung Seok;Park, Gyo Beom;Lee, Seong Geun
    • Journal of the Korean Chemical Society
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    • v.38 no.3
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    • pp.246-253
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    • 1994
  • The simultaneous analysis of 11 semi-volatile organic acid compound which are listed as priority pollutants by EPA, were performed by GC/MS-SIM(selected ion monitoring). Two extraction procedures, sonication extraction and Soxhlet extraction, were studied as an extraction and concentration method for priority pollutants in soil. Accurecy and precision of the methods were measured by the calculation of mean recovery, mean relative standard deviation, and method detection limit. Finally, limitations and prospects were discussed.

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Extraction Behavior of Uranyl Ion From Nitric Acid Medium by TBP Extractant in Ionic Liquid

  • Kim, Ik-Soo;Chung, Dong-Yong;Lee, Keun-Young
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.18 no.4
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    • pp.457-464
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    • 2020
  • In this study, extraction of uranium(VI) from an aqueous nitric acid solution was investigated using tri-n-butyl phosphate (TBP) as an extractant in an ionic liquid, 1-alkyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([Cnmim][Tf2N]). The distribution ratio of U(VI) in 1.1 M TBP/[Cnmim][Tf2N] was significantly high when the concentration of nitric acid was low. The value of the distribution ratio decreased as the concentration of the nitric acid increased at lower acidities, and then increased with a nitric acid concentration of up to 8 M. This can be attributed to the different extraction mechanisms of U(VI) based on nitric acid concentrations. Thus, a cation exchange at low acidity levels and an ion-pair extraction at high acidity levels were suggested as the extraction mechanism of U(VI) in the TBP/[Cnmim][Tf2N] system.

Solvent Extraction of Lithium Ion in Aqueous Solution Using TTA and TOPO (TTA와 TOPO를 이용한 수용액 중의 리튬이온 용매추출)

  • Lee, Jeon-Kyu;Jeong, Sang-Gu;Koo, Su-Jin;Kim, Si-Young;Ju, Chang-Sik
    • Korean Chemical Engineering Research
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    • v.51 no.1
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    • pp.53-57
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    • 2013
  • For the purpose of development of the extraction process of lithium ion from concentrated water eliminated from desalination process, an experimental research on the solvent extraction of lithium ion from aqueous solutions was performed. The effects of operating parameters, such as concentration of extractant, ratio of extracting solution/aqueous solution, pH of aqueous solution, were examined. The effect of sodium chloride, the major component of sea water, was also examined. Lithium ion in aqueous solutions of pH=10.2~10.6 adjusted by ammonia solution was most effectively extracted by extracting solution composed of 0.02 M TTA and 0.04 M TOPO in kerosine. The addition of sodium chloride in lithium aqueous solution significantly interfered the extraction of lithium ion.

The Optimum Condition Analysis of Vanadium Solvent Extraction by Alamine336 from the Synthetic Vanadium Sulfate Solution. (황산바나듐 모의용액으로부터 Alamine336에 의한 바나듐 용매추출의 최적조건 연구)

  • Ahn, Jong-Gwan;Ahn, Jae-Woo
    • Korean Journal of Metals and Materials
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    • v.46 no.12
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    • pp.823-829
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    • 2008
  • The solvent extraction process for the recovery of vanadium from leaching solution of SCR(selective catalytic reduction) spent catalyst was investigated by using Alamine336 as an extractant. The effects of experimental conditions, such as initial pH and concentration of sulfate ion, and ammonia concentration of stripping solution were studied. The extraction percentage of vanadium were increased with the increase of initial pH of leaching solution and decreased with the increase of sulfate ion. More than 99% of vanadium in leaching solution were extracted and stripped at the A/O ratio of 1.0 in 2 stages. On the basis of these results, an optimum solvent extraction process which vanadium was effectively recovered from SCR spent catalyst was proposed.

Property about Extraction of Metal Ion in the Synthesized Crown Ether Model Compounds (합성한 crown ether 모델 화합물에서 금속이온의 추출 특성 연구)

  • Lee, Yong-Hee;Suh, Myung-Gyo;Roh, Jong-Su;Lee, Kook-Eui;Lee, Young-Sei
    • Journal of the Korean Society of Industry Convergence
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    • v.6 no.3
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    • pp.165-169
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    • 2003
  • To extract alkali metal ions and heavy metal ions, search for crown ether model compounds (4a-b, 5a-b, 6a-b) bearing side arm has led to achieve in 5~6 steps starting from 2,6-dimethylaniline. The determination of structure in their compound derivatives were on the basis of melting point and nuclear magnetic resonance spectroscopy. In the solvent extraction of metal ions from the synthesized derivatives, we observed that silver ion has only high selectivity for synergistic ligation of crown ether.

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Simultaneous Analysis of Pesticide Priority Pollutants in Soil (토양 중의 Pesticide Priority Pollutants 동시 분석에 관한 연구)

  • Lee, Seung-Seok;Park, Young-Joo;Lee, Sueg-Geun
    • Analytical Science and Technology
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    • v.8 no.3
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    • pp.237-248
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    • 1995
  • The simultaneous analysis of 16 organic pesticides, which are listed as a part of 129 priority pollutants by EPA(Environmental Protection Agency), was performed by GC-ECD(electron capture detector) and GC/MS-SIM(selected ion monitoring). Two extraction procedures from SW-846, sonication extraction and Soxhlet extraction, were somewhat modified and compared as an extraction and concentration method for the analysis of priority pollutants in soil. Accuracy and precision of the methods were reported from the calculation of mean recovery, mean relative standard deviation, and method detection limit.

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Recovery of Indium from Secondary Resources by Hydrometallurgical Method (2차(次) 자원(資源)으로부터 습식방법(濕式方法)에 의한 인듐의 회수(回收))

  • Wang, Lingyun;Lee, Manseung
    • Resources Recycling
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    • v.22 no.2
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    • pp.3-10
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    • 2013
  • Indium is one of the rare metals, and it has been used mainly for preparation of indium tin oxide (ITO). This review investigated the process parameters and the merits and demerits of several methods to recover indium from the leaching solution of secondary resources, such as solvent extraction, ion exchange, and precipitation. D2EHPA has been used mostly as a cationic extractant for indium extraction in moderate acid solutions, while amine extractants are used in strong hydrochloric acid solution. Since the loading capacity of resins for indium is generally small, ion exchange has some advantage over solvent extraction only when the concentration of indium is low.

Ex-situ Remediation of a Contaminated Soil of Fe Abandoned Mine using Organic Acid Extractants (유기산 추출에 의한 철 폐광산 오염토양의 복원)

  • 정의덕;강신원;백우현
    • Journal of Environmental Science International
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    • v.9 no.1
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    • pp.43-47
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    • 2000
  • A study on the remediation of heavily for ion contaminated soils from abandoned iron mine was carried out, using ex-situ extraction process. Also, oxalic acid as a complex agent was evaluated as a function of concentration, reaction time and mixing ratio of washing agent in order to evaluate Fe removability of the soil contaminated from the abandoned iron mine. Oxalic acid showed a better extraction performance than 0.1N-HCl, i.e., the concentrations of Fe ion extracted from the abandoned mine for the former at uncontrolled pH and the latter were 1,750 ppm and 1,079 ppm, respectively. The optimum washing condition of oxalic acid was in the ratio of 1:5 and 1:10 between soil and acid solution during l hr reaction. The total concentrations of Fe ion by oxalic acid and EDTA at three repeated extraction, were 4,554 ppm and 864 ppm, respectively. The recovery of Fe ions from washing solution was achieved, forming hydroxide precipitation and metal sulfide under excess of calcium hydroxide and sodium sulfide. In addition, the amounted of sodium sulfide and calcium hydroxide for the optimal revovery of Fe were 15g/$\ell$ and 5g/$\ell$ from the oxalic acid complexes, respectively.

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Parameter Extraction Procedure for Ion Implantation Profiles to Establish Robust Database based on Tail Function

  • Suzuki, Kunihiro;Kojima, Shuichi
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.10 no.4
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    • pp.251-259
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    • 2010
  • We proposed a tail function parameter extraction procedure for the establishment of a robust ion implantation database. We showed that, for the expression of ion implantation profiles, there are many local minimum values set for the third and fourth moment parameters of $\gamma$ and $\beta$ for the Pearson function that comprises the standard dual Pearson and tail functions. We proposed the use of a joined tail function as a mediate function to extract $\gamma$ and $\beta$, and demonstrated that this enables us to extract the parameters uniquely. Other parameters associated with channeling phenomena can also be simply and uniquely extracted by our procedure.