• Title/Summary/Keyword: metal ion addition

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The Protective Role of Calcium in the Lethal Actions of Certain Metal Ions on the Growth of Lemna and Arabidopsis Plants (각종 금속염의 Lemna 및 Arabidopsis에 대한 치사작용과 석탄의 그 보호작용에 관하여)

  • Chung, Jun;Kwack, Beyoung-Hwa
    • Journal of Plant Biology
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    • v.12 no.3
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    • pp.1-7
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    • 1969
  • The lethal actions in Arabidopsis thaliana and Lemna polyrhiza brought about by certain inorganic form of Mn, Ba, Hg, Cu salts, and organic form of Na salts, were studied with aseptic artificial media. These metal ions at certain concentrations caused lethality of either Arabidopsis or Lemna when the media were without Ca ion. On the contrary, addition of Ca to the media protected the organisms from such lethality. It was postulated for the present from the proceeding evidence that Ca adsorbed and distributed along the sites between the plasma and cell membrane acts for suppressing permeation of toxic level of metal ions causing the lethality of these plants.

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A Study of the Metal Recovery from the Aluminium Scrap (Al 스크랩으로부터 금속회수에 관한 연구)

  • 김준수;임병모;윤의박
    • Resources Recycling
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    • v.4 no.1
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    • pp.25-30
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    • 1995
  • In the preparatIon of reclaimed aluminium lllgot from alumimum scrap, the aluminium recovery was studied a as a function of the preliminary treatment of samples, addition of flux and melting atmosphere. AI dross is produced by an oxidation reaction at the surface of liquid metal. The recovery of AI metal increases u up to maximum 95% by adding salt up to 7%, The recovery of AI metal in the compacted chip bale without oil removal mcrease about 14% compared io non-compacted chip. In the case of the AI seed melting process, the recovery of Al metal of the crushed and compacted chip hale is 97%, In meltmg of alumimum scrap under the atmosphere of carbon and nitrogen gas, the recovery of AI metal increase, but it is decreased when the mixture of salt and carbon powder is added excessively.

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Synthesis, Film Fabrication, and Optical Properties of Polymers Containing Metal Cation Complex Type D-$\pi$-A Chromophore (금속 양이온 배위형 D-$\pi$-A 발색단을 포함하는 폴리머의 합성 및 박막화와 광학특성)

  • Jeong, Seon-Ju;Kim, Hye-Ryun;Yoon, Keun-Byoung;Han, Yoon-Soo;Fujiki, Michiya;Takagi, Akiko;Kwak, Gi-Seop
    • Polymer(Korea)
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    • v.34 no.4
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    • pp.376-380
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    • 2010
  • Donor-$\pi$-acceptor (D-$\pi$-A) type chromophore-based polymers were newly synthesized. These polymers exhibited absorption peak due to intramolecular charge transfer (ICT) in a visible range as well as absorption peak due to carbonyl group in both solution and film state by measuring UV visible spectra. The addition of $Eu^{3+}$ ion into the polymers induced red-shift in absorption due to ICT and the color changes from yellow to red in the solution and film were observed by naked eyes. The contents of crosslinking agent influenced the features and solubility of the polymers. In addition, the contents of crosslinking agent and the $Eu^{3+}$ ion addition improved film-forming ability.

Determination of Ni in Fly Ash Leach Liquor by Spectrophotometric Method (분광학(分光學)적 방법(方法)에 의한 중유회(重油灰) 용출액(溶出液) 중(中)의 Ni 정량(定量)에 관(關)한 기초(基礎) 연구(硏究))

  • Jo, Jung-Min;Han, Hyea-Chul
    • Resources Recycling
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    • v.21 no.5
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    • pp.88-92
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    • 2012
  • We tried to measure the fixed quantity of $Ni^{2+}$ion among the metals which were eluted by distilled water from the Fly Ash Leach Liquor(FALL) with a spectrophotometric method. In addition, we researched absorbance values which had different contained quantity of $V^{3+}$ion in contrast with $Ni^{2+}$ion ppm to find out the influence of the $V^{3+}$ion existed in the FALL on the spectrophotometric fixed quantity of $Ni^{2+}$ion. As a result, when $V^{3+}$ ion has below 50% of amount of $Ni^{2+}$ion, the fixed quantity of $Ni^{2+}$ion among the FALL was able to be confirmed by spectrophotometry.

Complex of zinc(II) with tetraaza macrocyclic ligands in solution (용액에서 Zn(II)이온과 tetraaza 거대고리 리간드의 착물)

  • Koh Kwang-Oh
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.4
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    • pp.733-737
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    • 2006
  • In this paper, we report the coordination state and structure of $Zn(cyclam)Cl_{2})$ complex that was studied by the Raman spectrum and conductivity method. The complex of zinc(II) ion with 1,4,8,11-tetraazacyclotetradecane(cyclam) ligand is formed in aqueous solution. According to the Raman spectrum of $Zn(cyclam)Cl_{2})$ complex, $H_{2}O$ molecule and $Cl^{-}$ ion compete for the trans coordination site of zinc(II) ion. We also have investigated the competition effect of $H_{2}O$ molecule and $Cl^{-}$ ion by the conductivity method. On addition of 1,4,8,11-tetraazacyclotetradecane(cyclam) ligand to the aqueous $ZnCl_{2}$ solution, 2: 1 electrolyte is changed to 1:1 electrolyte. We suggest the possibility of elimination of heavy metal because of the affinity effect of macrocyclic polyamine(1,4,8.11-tetraazacyclotetradecane) for the heavy metal,.

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Studies on the Complexes of Lanthanide ion with Multidentate Ligand (I). Determination of Thermodynamic Parameters with Solution Calorimetric Method in Nonaqueous Solvents (란탄족 원소의 여러자리 리간드 착물에 관한 연구 (제 1 보) 물아닌 용액에서 용액열량계에 의한 열역학적 함수결정)

  • Sam-Woo Kang;Won-Hae Koo;Soo-Min Lee;Chang Choo-Hwan;Moo-Yol Seo
    • Journal of the Korean Chemical Society
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    • v.33 no.6
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    • pp.588-595
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    • 1989
  • Log K, ${\Delta}$H and ${\Delta}$S for the complexation of $La^{3+},\;Ce^{3+}$ and $Eu^{3+}$with various multidentate ligand containing crown ether, diaza crown ether and diamine ether have been determined in methanol and acetonitril solutions at $25^{\circ}C$ by solution calorimetric titration method. The greater stability constant of $La^{3+}$-15C5 than those of 18C6 diaza [2.2] in methanol are discussed in terms of the size of metal ion and the ligand cavity and of metal ion solvation. The stabilities of $Ce^{3+}$ and $La^{3+}$ ion complexes with a various multidentate ligand in acetonitril are in the order of (diamine ether)<18C6<15C5$Ce^{3+}$, $La^{3+}$ and $Eu^{3+}$-diaza [2.2] complexes in acetonitril are increased with the following order: $Eu^{3+}$ < $La^{3+}$ < $Ce^{3+}$, that is increasing order of the optimum size and of the charge density of metal ion.

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Propectives of Environmental Colorimetric-Sensors (환경색센서에 관한 기술 전망)

  • Kim, Younghun;Lee, Byunghwan
    • Korean Chemical Engineering Research
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    • v.49 no.4
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    • pp.393-399
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    • 2011
  • The electrochemical or optical sensors for environmental pollutants are developed over the past several years. Nowadays, the development of colorimetric sensing is particularly challenging since it requires no equipment at all as color changes can be detected by the naked eye. Visual detection can give immediate qualitative information and is becoming increasingly appreciated in terms of quantitative analysis. In addition, simple colorimetric-sensor have shown useful in the detection, identification, and quantification of volatile organic compounds(VOC) in gas phase or heavy metal ion in aqueous phase. In this review, we investigated the wide applications and some drawbacks of colorimetric-sensors. And thus, we try to suggest the methodologies of development approach of multi-functional and reversible colorimetric-sensor.

Electrochemical corrosion study on base metals used in nuclear power plants in the HyBRID process for chemical decontamination

  • Kim, Sung-Wook;Park, Sang-Yoon;Roh, Chang-Hyun;Shim, Ji-Hyung;Kim, Sun-Byeong
    • Nuclear Engineering and Technology
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    • v.54 no.6
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    • pp.2329-2333
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    • 2022
  • Base metal corrosion forms a significant issue during the chemical decontamination of the primary coolant loop in nuclear power plants as it is directly related to the economic and safety viability of decommissioning. In this technical note, potentiodynamic evaluations of several base metals (304 stainless steel, SA106 Grade B carbon steel, and alloy 600) were performed to determine their corrosion behavior during the hydrazine (N2H4)-based reductive ion decontamination (HyBRID) process. The results suggested that N2H4 protected the surface of the base metals in the HyBRID solution, which is primarily composed of H2SO4. The corrosion resistance of the carbon steel was further improved through the addition of CuSO4 to the solution. The corrosion rate of carbon steel in the H2SO4-N2H4-CuSO4 solution was lower than that exhibited in an oxalic acid solution, a commonly used reaction medium during commercial decontamination processes. These results indicate the superiority of the HyBRID process with respect to the base metal stability.

Fabrication of Nano Porous Silicon Particle with SiO2 Core Shell for Lithium Battery Anode (리튬 배터리 음극용 SiO2 코어 쉘을 갖춘 나노 다공성 실리콘 입자 제조)

  • Borim Shim;Eunha Kim;Hyeonmin Yim;Won Jin Kim;Woo-Byoung Kim
    • Korean Journal of Materials Research
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    • v.34 no.7
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    • pp.370-376
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    • 2024
  • In this study, we report significant improvements in lithium-ion battery anodes cost and performance, by fabricating nano porous silicon (Si) particles from Si wafer sludge using the metal-assisted chemical etching (MACE) process. To solve the problem of volume expansion of Si during alloying/de-alloying with lithium ions, a layer was formed through nitric acid treatment, and Ag particles were removed at the same time. This layer acts as a core-shell structure that suppresses Si volume expansion. Additionally, the specific surface area of Si increased by controlling the etching time, which corresponds to the volume expansion of Si, showing a synergistic effect with the core-shell. This development not only contributes to the development of high-capacity anode materials, but also highlights the possibility of reducing manufacturing costs by utilizing waste Si wafer sludge. In addition, this method enhances the capacity retention rate of lithium-ion batteries by up to 38 %, marking a significant step forward in performance improvements.

Synthesis and Characterization of Tetrathiafulvalene (TTF) and 7,7,8,8-Tetracyanoquinodimethane (TCNQ) Compounds with PdX2(X=CI, NO3and Hexafluoroacetylacetonate)

  • Kim, Young-Inn;Jeong, Chan-Kyou;Lee, Yong-Min;Choi, Sung-Nak
    • Bulletin of the Korean Chemical Society
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    • v.23 no.12
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    • pp.1754-1758
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    • 2002
  • Tetrathiafulvalene(TTF) reacts with $PdCl_2,Pd(NO_3)_2$ and $Pd(hfacac)_2$(hexafluoroacetylacetonate) in ethanol to give $(TTF)_{1.5}PdCl_2$ (1a), $(TTF)_3Pd(NO_3)_2$ (1b) and $(TTF)_4Pd(hfacas)_2$ nd (1c), respectively. $PdCl(TCNQ)_{2.5}{\cdot}CH_3OH(2a)$was obtained from the reaction of $PdCl_2$ with LiTCNQ in methanol via the partial replacement of $Cl^-$ in $PdCl_2$ by $TCNQ^-$anion, whereas the total substitution of the labile $NO_3^-$ in $Pd(NO_3)_2$ yielded pd(TCNQ)·$CH_3OH$ (2b). $Pd(hfacac)_2(TCNQ)_2\cdot3CH_3OH$ (2c) was obtained from $Pd(hfacac)_2$ and LiTCNQ in methanol. The prepared compounds were characterized by spectroscopic (IR, UV, XPS) methods and magnetic (EPR, magnetic susceptibility) studies. The powdered electrical conductivities (${\sigma}_{rt}$) of the prepared compounds at room temperature were about~$10^{-7}S{\cdot}cm^{-1}$. The effective magnetic moments were lass than the spin-only value of one unpaired electron and no EPR signals from Pd metal ions were observed in any of the compounds, indicating that the Pd ions were diamagnetic and the magnetic moments arose from$(TTF)_n$ or $(TCNQ)_n$ moieties. The experimental evidences revealed that the charge transfer had occurred form $(TTF)_n$ moiety to the central Pd metal ion in 1a, 1b and 1c. Thus the TTF donors were ions in 2a and 2b were diamagnetic Pd(II) oxidation state. In contrast, the Pd metal ion was oxidized to Pd(IV) state in 2c as a result of an addition of $TCNQ^-$anion to $Pd(hfacac)_2$ in methanol. The oxidation states of the Pd metal ions were confirmed using the x-ray photoelectron spectroscopy.