• Title, Summary, Keyword: EDTA

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Effects of CuEDTA and FeEDTA Foliar Spray on Antioxidant Activities of Apple (CuEDTA와 FeEDTA의 엽면살포가 사과의 항산화 활성에 미치는 영향)

  • Park, Ji-Young;Ryu, Ho-Ung;Shin, Hyun-Suk;Lim, Heon-Kyu;Son, In-Chang;Kim, Dae-Il;Jeong, Heon-Sang;Lee, Jun-Soo
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.41 no.9
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    • pp.1305-1309
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    • 2012
  • For functional enhancement of apples, the effects of CuEDTA and FeEDTA foliar spray were investigated on the antioxidant contents and antioxidant activities in 'Hongro' fruit, which is a representative early season harvesting apple cultivar, at 30 days before harvest. The polyphenolic content of peel was significantly higher in the CuEDTA (1,228.6 mg/100 g) and FeEDTA (1,210.0 mg/100 g) spraying treatment groups compared to the control group (998.8 mg/100 g). The flavonoid content of peel showed the same trend as that of polyphenolic content. The ascorbic acid content of peel as also significantly increased in the CuEDTA and FeEDTA spraying treatment groups, but anthocyanin content was the highest in the control group (560.6 mg/100 g). The ABTS and DPPH radical scavenging activities were higher in the CuEDTA and FeEDTA spraying treatment groups than in the control group, but reducing power was not significantly different between the treatments. As a result of this study, 3% CuEDTA and FeEDTA spraying treatments at 30 days before harvest can be used to effectively enhance antioxidant contents in 'Hongro' apple.

Recovery of EDTA from Waste Fluid of Archeological Waterlogged Wood Conservation Treatment (수침목재유물(水浸木材遺物) 보존처리(保存處理) 폐수(廢水)로부터 EDTA회수(回收))

  • Yang, Seok-Jin;Song, Ju-Yeong;Kim, Jong-Hwa
    • Journal of the Korean Institute of Resources Recycling
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    • v.20 no.5
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    • pp.58-63
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    • 2011
  • pH control-precipitation method is used for recovery of EDTA from waste fluid of archeological waterlogged wood conservation treatment. EDTA has been used for eliminating of blacken effect in archeological waterlogged wood which was buried in the ground for long period of time. The black substance is generated by Fe$^{3+}$ in the soil reacted with tannin in the archeological waterlogged wood. In order to remove the black substance in archeological waterlogged wood, EDTA was used. The black substance is eliminated from wood as Fe-EDTA complex are formed, and EDTA is separated and precipitated from Fe-EDTA complexes at pH 2.68 or less. The result of analysis of the precipitated products and the commercial EDTA by FT-IR and FE-SEM showed that precipitated product by pH adjusted was not a type of Fe-EDTA complex, but pure EDTA. In this study, Fe$^{3+}$ from waste fluid of EDTA can be separated by HCl added. EDTA can be recycled by using the method of precipitation of EDTA in a strong acid.

The effect of dissolved oxygen and initial complextation of Cu(II) and EDTA on photooxidation of Cu(II)-EDTA by TiO2 (TiO2 광측매를 이용한 Cu(II)-EDTA의 산화에서 용존산소와 Cu(II)와 EDTA 초기 당량의 영향)

  • 정흥호;성기웅;조영현;이영석;최상원
    • Journal of Environmental Science International
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    • v.11 no.1
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    • pp.85-91
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    • 2002
  • The effects of initial concentration of dissolved oxygen content, Cu(II) and EDTA in an aqueous Cu(II)-EDTA solution on $TiO_2$ photo-oxidation of EDTA were investigated using $TiO_2$ (Degussa P-25) and UV irradiation at $20{\circ}C$. In the presence of dissolved oxygen and/or Cu(II) the photo-oxidation rates of EDTA were enhanced. The rates linearly increased in the range of initial Cu(II) concentration below 1.79 mM, while abode this concentration those were kept constant. The trend or the EDTA photo-oxidation rates appeared to be akin to the Langmuir-Hinshelwood equation farm and the k values calculated were 0.05 mM/min for the free-EDTA system, and 0.17 mM/min far the Cu(II)-EDTA system. These meant the aqueous EDTA decomposition was enhanced due to weakening of the intra-molecular bond strength of EDTA by complexation with Cu(II) added. It was concluded the decomposition of aqueous EDTA by $TiO_2$ photo-oxidation was maximum in the presence of dissolved oxygen supplied by air purging and of Cu(II) with its concentration for 1:1 Cu(II)-EDTA complexation ratio.

Study on the Ion Exchange Mechanism of Rare Earth Elements in Several Elution Types (I) (희토류원소의 여러가지 용리형태의 이온교환 메카니즘에 관한 연구 (제 1 보))

  • Ki-Won Cha;Sung-Wook Hong
    • Journal of the Korean Chemical Society
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    • v.33 no.2
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    • pp.232-237
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    • 1989
  • The elution mechanism of rare earth elements in cation exchange resin which was substituted with $NH_4^+,\;Zn^{2+}\;or\;Al^{3+}$ as a retaining ion had been investigated. Rare earths or rare earths-EDTA complex solution was loaded on the top of resin bed and eluted with 0.0269M EDTA solution. When the rare earth-EDTA complex was adsorbed on the $Zn^{2+}\;or\;Al^{3+}$ resin form, retaining ion was complexed with EDTA and liberated rare earths was adsorbed in the resin again. Adsorbed rare earths in resin phase could be eluted by the complexation reaction with EDTA eluent. On $NH_4^+$ resin form, the rare earth-EDTA complex which had negative charge could not adsorbed on the cation exchange resin because the complexation reaction between $NH_4^+$ and EDTA was impossible. So the elution time was much shorter than in $Zn^{2+}\;or\;Al^{3+}$ resin form. When the rare earths solution was loaded on the $Zn^{2+},\;Al^{3+}$ resin form bed, rare earths was adsorbed in the resin and the retaining ion was liberated. Adsorbed rare earths in resin bed was exchanged by EDTA eluent forming rare earths-EDTA complex, and eluted through these processes. On $NH_4^+$ resin form, rare earths loaded was adsorbed by exchange reaction with $NH_4^+$. As the EDTA eluent was added, rare earths was liberated from resin forming negatively charged rare earth-EDTA complex and eluted without any exchange reaction. So the elution time was greatly shortened and there was no metallic ion except rare earths in effluent. When the $Zn^{2+}\;and\;Al^{3+}$ was used as retaining ion, the pH of efflent was decreased seriousely because the $H^+$ liberated from EDTA molecule.

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Study on the Precision Analysis of Lanthanides by Atomic Emission Spectroscopy (I). Separation of Rare Earth Elements Using Ln-EDTA Eluent (원자발광광도법에 의한 란탄족 원소의 정밀분석에 관한 연구 (제 1 보) 희토류-EDTA 용리액에 의한 희토류 원소의 분리 회수)

  • Cha Ki-Won;Oh Jin-Hee;Ha Young-Gu;Kim Ha-Suck
    • Journal of the Korean Chemical Society
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    • v.36 no.5
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    • pp.692-696
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    • 1992
  • $NH_4^+ form cation exchange resin was used to separate one rare earth element from the rare earth mixture solution using Ln-EDTA eluent. Rare earth mixture solution was passed through the resin bed and eluted with 0.1M La-EDTA solution as an eluent. In here all the rare earth element except lanthanum ion are eluted and lanthanum ion absorbed in resin bed is eluted using 0.1M EDTA solution. If Ce-EDTA solution instead of La-EDTA solution was used as an eluent, all the rare earth element except cerium ion are eluted and cerium ion is eluted with 0.1M EDTA solution. This method can be applied to separate the individual rare earth element from the mixture. The separation mechanism is as follows: Absorption : 3RNH_4 + Ln^{3+} = R_3Ln + 3NH_4^+, La-EDTA elution : R_3Ln + La-Y- = R_3La + Ln-Y-, EDTA elution : R_3La + HY^3- = La_-Y + RH + 2R^-.$

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Separation of Rare Earth Elements Using Ln-EDTA Eluent in an Anion Exchanger (음이온 교환수지에서의 희토류-EDTA 용리액에 의한 희토류 원소의 분리)

  • Cha, Ki-Won;Park, Chan-Il;Chang, Byung-Doo;Hong, Sung-Wook
    • Analytical Science and Technology
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    • v.10 no.1
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    • pp.53-59
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    • 1997
  • Chloride form anion exchange resin was used to separate one of the elements from the rare earth mixture using respectable Ln-EDTA eluent. $Sm^{3+}$, $La^{3+}$ or $Ce^{4+}$ complexed with EDTA was passed through the resin column and eluted with a Sm-EDTA solution as an eluent. Here all the rare earth element ions except $Sm^{3+}$ were passed. Adsorbed $Sm^{3+}$ in resin was eluted with 1.0 M HCl solution. If La-EDTA solution as an eluent was used to separate lanthanum ions, lanthanum ions were eluted together with other rare earth elements. When Ce-EDTA solution was also used for separation of $Ce^{4+}$, it was eluted in the region of other rare earth elements. In the case of Sm-EDTA elution, the elution mechanism was as follows : Absorption : $RCl+Ln-Y^-{\leftrightarrows}RLnY+Cl^-$, Sm-EDTA elution : $RLnY+Sm-Y^-{\leftrightarrows}RSmY+Ln-Y^-$, HCl elution : $RSmY+HCl{\leftrightarrows}RCl+Sm-Y^-$.

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EDTA 함유폐액의 시멘트 고화연구

  • 김종현;김준형;이익환;이경구
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.501-506
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    • 1996
  • 원자력발전소의 2차 냉각계통 제염 공정인 EPRI/SGOG 공정에서는 EDTA를 제염제로 사용하고 있다. EDTA는 수용액 상에서는 20$0^{\circ}C$까지 안정하며 제염후 존재하는 유리 EDTA (EDTA-2NH$_4$)는 시멘트 수화반응에 의해 생성되는 Ca이온과 결합하여 EDTA-Ca 착이온이 형성된다. 따라서 CSH(Calcium Silicate Hydrate)겔의 형성을 억제함으로써 시멘트 경화반응을 지연시킨다. 현재 우리나라에서는 EDTA가 함유한 제염폐액의 처리방법의 미결정으로 인하여 자체 저장하고 있으나 고화체의 최종 처분조건을 만족하며 감용률을 최대화 할 수 있는 처리방법이 필요하다. 본 연구에서는 유리 EDTA가 소석회의 발생을 억제시켜 경화반응에 영향을 주는 점을 고려하여 유리 EDTA 용액에 소석회로 전처리 하여 시멘트 고화한 고화체의 물성시험을 수행하였다. 연구결과 EDTA와 소석회 반응 몰비가 1이 되게 전처리할 경우 시멘트에 대한 물의 배합비는 27%이상이 되어야 하며, 유리 EDTA 함량이 20wt%인 용액에서 폐액/시멘트/소석회비가 33.4/65/1.6일때 최대의 감용률을 나타내는 건전한 고화체의 조성비를 얻었다.

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Effective Method for Lend Extraction from Pb - Contaminated Soil with EDTA (EDTA를 사용한 납 오염 토양에서의 효율적인 납 추출)

  • 김철성
    • Journal of Korea Soil Environment Society
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    • v.4 no.1
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    • pp.3-11
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    • 1999
  • The effects of major cations in soils, soil : extractant ratio, and EDTA : lead stoichiometric ratio on the extraction efficiency of lead using EDTA were studied for 4 different actual lead-contaminated soils and one artificially lead-contaminated soil. Extraction of lead from the lead-contaminated soil was not affected by a soil : extractant ratio as low as 1 : 3 but instead was dependent on the quantity of EDTA present. Results of the experiments showed that the extraction efficiency for each soil was different, but if sufficiently large amount of EDTA was applied, all the lead may be extracted except for a soil from lead mining area. The differences in extraction efficiencies nay be due to the major cations present in soils which may compete with lead for active sites on EDTA. The total molar amount of major cations extracted was as muck as 20 times more than the added molar amount of EDTA. For some of the soils tested, the extraction efficiency of lead may be affected by being occluded in the Fe and Mn oxides present in the soil. While major cations present in the soil may be one of the factors affecting lead extraction efficiency, the type of lead species present may also play a role. When these factors affect severely, the using of EDTA to extract lead from lead-contaminated soil might be non-effective method.

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EDTA-Enhanced Electrokinetic Removal of Cu and Zn from Contaminated Sandy Soil (동전기 기술과 세척제 EDTA를 이용한 모래 토양으로부터 구리 및 아연의 제거)

  • Lee, Hyo-Sang;Hong, Soon-Myong;Ko, Sung-Hwan;Lee, Ki-Say
    • Journal of the Korean Geoenvironmental Society
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    • v.3 no.1
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    • pp.37-45
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    • 2002
  • EDTA-enhanced electrokinetic removal of copper and zinc from contaminated sandy soil was carried out. In desorption equilibrium tests, the required mass ratio of EDTA to metal was 10:1 to obtain over 90% of desorption from soil. The removal of heavy metals with chelating agent EDTA below pH 3 was limited because of EDTA precipitation. In electrokinetic experiments, the pH control at anode chamber was essential and 38% Cu and 56% Zn were removed under 30 mA for 1.5 days. Heavy metal removal was greatly improved by controlling anode and soil pH with circulation of anolyte with NaOH solution, in which >50% heavy metal was removed for 4 days and >70% for 9 days.

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The chelation of EDTA sodium salts solution for the root canal dentin treatment (상아질 치관 치료를 위한 EDTA Na염의 킬레이션)

  • Song, Kun-Ho;Chang, Hwa-Ik;Lee, Kwang-Rae
    • Journal of Industrial Technology
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    • v.31 no.A
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    • pp.59-62
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    • 2011
  • The demineralizing effect of chelating agents(Maleic acid solution, EDTA salts solutions; disodium-, trisodium- and tetrasodium-EDTA) on hydroxyapatite(HA) for the root canal dentin treatment was investigated. Dissolution of Ca from HA was increased with increasing immersion time in chelating solutions. Among the EDTA salts solutions, tetrasodium-EDTA was least effective in dissolving Ca out from HA, and trisodium-EDTA was the most effective. Trisodium-EDTA solutionmight be more effective in removing the smear layer compared to tetrasodium-EDTA solution.

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