• Title/Summary/Keyword: 이온 성분

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Chloride Penetration Analysis of Fly Ash Concrete using Potentiometric Titration and XRF (플라이애시를 혼입한 콘크리트의 전위차 적정법과 XRF를 이용한 염화물 침투 분석 )

  • Eun-A Seo;Ji-Hyun Kim;Ho-Jae Lee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.5
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    • pp.16-22
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    • 2023

  • In this study, a salt water immersion test was performed on concrete specimens simulating the concrete mix design of the nuclear power plant, and the correlation between the amount of chloride and the XRF component according to the depth of the concrete was analyzed. The amount of chloride on the surface of the nuclear power plant concrete increased slightly with increasing immersion time in salt water, but the amount of chloride in the depth of 5.5 mm or more showed a clear tendency to increase with increasing immersion time in salt water. As a result of analyzing the correlation between the amount of chloride in concrete and the XRF component, the concrete with 20% FA substitution compared with the OPC concrete showed a very high correlation between the composition ratio of Cl ions and the evaluation result of salt damage resistance by XRF component analysis. Accordingly, it was confirmed that chlorine ion analysis and salt damage resistance performance evaluation by XRF component analysis were possible through repeated data accumulation in the nuclear power plant concrete mix with 20% fly ash replacement.

  • https://doi.org/10.11112/jksmi.2023.27.5.16 인용 PDF

Synthesis of Multifunctional AN-co-(MMA/IA) Fibrous ion-exchanger by Hydrolysis and Adsorption Properties for Trace Transition Elements (가수분해에 의한 AN-co-(MMA(IA) 다관능성 섬유이온교환체의 합성 및 미랑 전이금속 흡착특성)

  • 황택성;이선아;황계순
    • Polymer(Korea)
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    • v.25 no.6
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    • pp.765-773
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    • 2001

  • In In order to remove harmful trace elements such as $Co^{2+}$, $Ni^{2+}$ , $Cr_2O_7\;^{2-}$ from water, we synthesized AN-co-(MMA/IA) according to various mole ratio of monomers and spun by wet-spinning. And multi-functional PAN ion exchangers were prepared by hydrolysis. We observed structure, degree of functionalization, ion exchange capacity, distribution coefficient and mechanical properties for ion exchanger. Anion exchange capacity decreased in 4.5 ~ 4.2 meq/g with increasing of IA content and cation exchange capacity increased in 1.8 ~ 2.2 meq/g. Tensile strength of the ion exchanger increased up to 0.008 mol% IA content and appeared maximum value by 216$kg/cm^2$Distribution coefficient for AN-co-(MMA/IA) ion exchanger appeared maximum value for Co(II), Ni(II) in pH 5-6 range and for Cr(III) in pH 3-4 range. And the adsorption capacity was in the order of Cr(III) > Co(II) > Ni(II) for multicomponent in continuous process.

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Long-term Trends of the Concentrations of Mass and Chemical Composition in PM2.5 over Seoul (서울시 대기 중 초미세먼지 (PM2.5) 질량과 화학성분 농도의 장기 변동 추이)

  • Han, Sang Hee;Kim, Yong Pyo
    • Journal of Korean Society for Atmospheric Environment
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    • v.31 no.2
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    • pp.143-156
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    • 2015

  • The literature data of the mass concentrations of TSP, $PM_{10}$, and $PM_{2.5}$, and chemical composition of $PM_{2.5}$ (sulfate, nitrate, ammonium, OC, and EC) from 1985 and 2013 at Seoul were collected and the temporal trends were discussed in relation with the policy directions. Generally, the mass concentrations of TSP, $PM_{10}$, and $PM_{2.5}$ at Seoul have showed decreasing trends. However, it is not clear what might be the major reason(s) for the trends. The concentrations of ionic component in $PM_{2.5}$ showed different trends, sulfate being reduced during the 1990s but no trend during the 2000s. The concentrations of nitrate and ammonium were increasing during the 2000s. The concentrations of OC show no apparent trend while that of EC decreased. Further policy directions are suggested based on the temporal trends of the chemical composition in $PM_{2.5}$.

  • https://doi.org/10.5572/KOSAE.2015.31.2.143 인용 PDF KSCI