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Relevant bibliographies by topics / Oxalate ions

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Academic literature on the topic 'Oxalate ions'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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Journal articles on the topic "Oxalate ions"

1

Gavris, Georgeta, Oana Stanasel, Rodica Pode, Marcela Stoia, and Virgil Chitac. "Study upon the Recuperative Purging of Nickel and Cobalt Ions from Residual Solutions by Means of Chemical Precipitation." Revista de Chimie 59, no. 1 (February 9, 2008): 61–64. http://dx.doi.org/10.37358/rc.08.1.1708.

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The study introduces a cleaning method of waste waters with nickel and cobalt ions content, by the precipitation of these ions as oxalates. The aim of the study is to establish the optimum conditions for a high degree of a metal recovery like nickel oxalate or cobalt oxalate, due to the low value of their products of solubility. The parameters studied were: pH, excess of reactant reagents, concentration of ions and temperature. The crystalline form of the obtained products corresponds to: NiC2O4�2H2O and CoC2O4�2H2O and extraction degree of metals was around 99%.

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Hind, A. R., S. K. Bhargava, W. Van Bronswijk, S. C. Grocott, and S. L. Eyer. "On the Aqueous Vibrational Spectra of Alkali Metal Oxalates." Applied Spectroscopy 52, no. 5 (May 1998): 683–91. http://dx.doi.org/10.1366/0003702981944355.

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Fourier transform infrared attenuated total reflectance and Fourier transform Raman spectra of the series of aqueous alkali metal oxalates—lithium oxalate (Li2C2O4), sodium oxalate (Na2C2O4), potassium oxalate (K2C2O4), rubidium oxalate (Rb2C2O4), and cesium oxalate (Cs2C2O4)—are presented for the first time. Fourier transform Raman spectra of the solid oxalates are also presented for the first time. The solid and aqueous oxalate ions are assumed to possess D2 h and D2 d symmetry, respectively, and the assignment of fundamental vibrational modes is made accordingly. The effect of increasing alkali metal ion concentration on the aqueous spectra of these oxalates is also reported. Spectral changes are explained in terms of the ability of the respective alkali metal cations to interact with the oxalate anion in solution. It is proposed that these differences arise because the alkali metal cations associate with the aqueous oxalate anions to varying degrees, depending upon the nature of the cation. The extent of the binding is found to decrease down the alkali metal series (Li > Na > K > Rb > Cs). Similar results obtained for the tetramethylammonium cation [(CH3)4N+] suggest that it is a softer cation than cesium.

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Puzan, Anna N., Vyacheslav N. Baumer, and Pavel V. Mateychenko. "Novel modification of anhydrous transition metal oxalates from powder diffraction." Acta Crystallographica Section C Structural Chemistry 73, no. 11 (October 13, 2017): 911–16. http://dx.doi.org/10.1107/s2053229617012839.

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The known metal–C2O4 structures may be divided into two modifications, α and β. The α-modification has an order–disorder struxture, revealing one-dimensional disordering of the metal–oxalate chains, and the β-modification is ordered. The crystal structures of orthorhombic γ-MnC2O4 {poly[μ-oxalato-manganese(II)]; space group Pmna, a = 7.1333 (1), b = 5.8787 (1), c = 9.0186 (2) Å, V = 378.19 (1) Å3, Z = 4 and Dx = 2.511 Mg m−3} and γ-CdC2O4 {poly[μ-oxalato-cadmium(II)]; space group Pmna, a = 7.3218 (1), b = 6.0231 (1), c = 9.2546 (2) Å, V = 408.13 (1) Å3, Z = 4 and Dx = 3.262 Mg m−3} have been obtained from powder diffraction patterns. The structures are isostructural. Each metal atom in each structure is coordinated by seven O atoms which belong to five oxalate ions. The crystal packing, which contains noticeable cavities in the [101] and [001] directions, is not close packed and essentially differs from the known disordered α- and ordered β-modifications of transition metal oxalates. This modification seems to be metastable. It was found that a spontaneous γ→β phase transition takes place for γ-CdC2O4.

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Piro, O. E., G. A. Echeverría, and E. J. Baran. "Spontaneous enantiomorphism in poly-phased alkaline salts of tris(oxalato)ferrate(III): crystal structure of cubic NaRb5[Fe(C2O4)3]2." Acta Crystallographica Section E Crystallographic Communications 74, no. 7 (June 8, 2018): 905–9. http://dx.doi.org/10.1107/s2056989018008022.

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We show here that the phenomenon of spontaneous resolution of enantiomers occurs during the crystallization of the sodium and rubidium double salts of the transition metal complex tris(oxalato)ferrate(III), namely sodium pentarubidium bis[tris(oxalato)ferrate(III)], NaRb5[Fe(C2O4)3]2. One enantiomer of the salt crystallizes in the cubic space groupP4332 withZ= 4 and a Flack absolute structure parameterx= −0.01 (1) and its chiral counterpart in the space groupP4132 withx= −0.00 (1). All metal ions are at crystallographic special positions: the iron(III) ion is on a threefold axis, coordinated by three oxalate dianions in a propeller-like conformation. One of the two independent rubidium ions is on a twofold axis in an eightfold coordination with neighbouring oxalate oxygen atoms, and the other one on a threefold axis in a sixfold RbO6coordination. The sodium ion is at a site ofD3point group symmetry in a trigonal–antiprismatic NaO6coordination.

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Yusenko, Elena, Evgeniya Polyntseva, Anna Lyzhova, and Olga Kalyakina. "Determination of Oxalate and Some Inorganic Anions in Green and Black Tea." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences 67, no. 4-5 (November 1, 2013): 429–32. http://dx.doi.org/10.2478/prolas-2013-0076.

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Abstract Oxalate concentration differs in various daily consumed food products. The role of oxalic acid in the human body is very significant, as its compounds are responsible for the stability of biological membranes. However, insoluble calcium and magnesium oxalates can be accumulated in the body in the form of kidney stones. Oxalate concentration has been measured by high performance liquid, gas after derivatization and ion chromatography (IC). The most effective method for the simultaneous determination of oxalate and inorganic anions is ion chromatography with conductometric detection. Here, we report the results of the measurement of oxalic acid in bleak and green tea samples. Separation was performed by IC on an anion-exchange column Shodex IC SI-90 with surface-layer sorbent and conductimetric detection. The main analytical features of the method were: limit of detection of oxalic acid 0.03 mg/l, linear range 0.1-20 mg/l, correlation 0.9998, relative standard deviation 1%. The method did not need specific sample treatment and was successfully applied to the analysis of black and green tea samples. Oxalic acid was determined in the ranges 16.7-84 mg/l for green tea and 63-116 mg/l for black tea. Green tea contained lower oxalate ions concentration than black tea. The IC method has a lower detection limit for oxalate ions than HPLS and GC, ten and two times less, respectively

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Hsu, Yu-Chao, Li-Cheng Pan, and Lie-Ding Shiau. "A Photomicroscopic Study on the Growth Rates of Calcium Oxalate Crystals in a New Synthetic Urine without Inhibitors and with Various Inhibitors." Crystals 11, no. 3 (February 25, 2021): 223. http://dx.doi.org/10.3390/cryst11030223.

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A photomicroscopic growth apparatus was used to study the growth rates of calcium oxalate crystals in a new synthetic urine without inhibitors and with various inhibitors, including magnesium ions, citrate ions, chondroitin sulfate ions, and phytate ions. The dependence of growth rates on supersaturation at different temperatures without inhibitors was investigated using a power law model in terms of the Arrhenius form. The effects of various inhibitors on the growth rates of calcium oxalate indicated that the inhibition of growth rates increases in the order magnesium ions < citrate ions < chondroitin sulfate ions < phytate ions. The polymorphic forms of calcium oxalate crystals without inhibitors and with various inhibitors were examined by scanning electron microscopy.

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El MostafaMtairag, Abdelaziz ELAmrani. "Inhibiting Effect of Moroccan Medicinal Plants on Crystallization of Oxalo-calcic Calculations in vitro." Universities' Journal of Phytochemistry and Ayurvedic Heights 1, no. 30 (June 26, 2021): 18–26. http://dx.doi.org/10.51129/ujpah-june2021-30-1(3).

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Abstract- The aim of this work is to study the inhibitory effect of some Moroccan medicinal plants: parsley, nettle, oregano and corn beard on the crystallization of oxalocalcium urinary stones under experimental conditions which simu l a t e t h e u ri n a r y e n v ir o nme n t (physiological concentrations in calcium and oxalate, temperature and pH). The experimental tests were followed by the turbidimetric method using UV-Visible Model SP8-400 spectrophotometry, the response of which restores the concentration of calcium oxalate. The results showed that the potassium and magnesium ions which constitute the main elements of these plants compete with the calcium ions in order to combine with the oxalate ions. All the competitive reactions reflecting the affinities of the different ions towards each other contribute to the observed overall inhibition of the crystallization of calcium oxalate. Keywords: Crystallization, Urinary Calculus, Calcium oxalate, Inhibition, Moroccan Medicinal Plants

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Li, Jia Ming, Shu Qing Xu, and Zhong Feng Shi. "Molecular and Crystal Structure Analysis of an Oxalate-Bridged Sodium 2D Polymer: [Na(μ_1,1,2,3-Oxalato)(di-μ_1,1-H₂O)]_N." Advanced Materials Research 399-401 (November 2011): 916–20. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.916.

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The title compound, [Na(μ1,1,2,3-oxalato)(di-μbelongs to triclinic, space group P-1 with a = 5.6982 (11), b = 6.5040 (12), c = 6.6647 (13) Å, α = 75.040 (2), β = 84.990 (3), γ = 70.072 (3), V = 224.34 (7) Å3, C2H3NaO5, Mr = 130.03, Z = 2, Dc = 1.925 g/cm3, μ = 0.270 mm–1and F(000) = 132. Each sodium ions is located on crystallographic inversion symmetry centre and surrounded by six oxygen donors from three oxalate ligands and two di-μ1,1-waters in a distorted octahedron geometry. Two planar 4-member cyclβes crystallographic inversion are found in alternate repeated Na2O2subunit, which is further extended to two dimensional supermolecular fragment via μ1,1,2,3-oxalato-bridged. The crystal structure is aggregated to a 3D network through O-H…O hydrogen bonding involving the water molecules and oxalate oxygen atoms.

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Liu, Chen, and Khalil A. Abboud. "Crystal structures of μ-oxalato-bis[azido(histamine)copper(II)] and μ-oxalato-bis[(dicyanamido)(histamine)copper(II)]." Acta Crystallographica Section E Crystallographic Communications 71, no. 11 (October 28, 2015): 1379–83. http://dx.doi.org/10.1107/s2056989015019908.

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The title compounds, μ-oxalato-κ4O1,O2:O1′,O2′-bis[[4-(2-aminoethyl)-1H-imidazole-κ2N3,N4](azido-κN1)copper(II)], [Cu2(C2O4)(N3)2(C5H9N3)2], (I), and μ-oxalato-κ4O1,O2:O1′,O2′-bis[[4-(2-aminoethyl)-1H-imidazole-κ2N3,N4](dicyanamido-κN1)copper(II)], [Cu2(C2O4)(C2N3)2(C5H9N3)2], (II), are two oxalate-bridged dinuclear copper complexes. Each CuIIion adopts a five-coordinate square-pyramidal coordination sphere where the basal N2O2plane is formed by two O atoms of the oxalate ligand and two N atoms of a bidentate chelating histamine molecule. The apical coordination site in compound (I) is occupied by a monodentate azide anion through one of its terminal N atoms. The apical coordination site in compound (II) is occupied by a monodentate dicyanamide anion through one of its terminal N atoms. The molecules in both structures are centrosymmetric. In the crystals of compounds (I) and (II), the dinuclear complexes are linked through N—H...Xand C—H...X(X= N, O) hydrogen bonds where the donors are provided by the histamine ligand and the acceptor atoms are provided by the azide, dicyanamide, and oxalate ligands. In compound (I), the coordinatively unsaturated copper ions interact with the histamine ligandviaa C—H...Cu interaction. The coordinatively unsaturated copper ions in compound (II) interactviaa weak N...Cu interaction with the dicyanamide ligand of a neighboring molecule. The side chain of the histamine ligand is disordered over three sets of sites in (II).

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Chandra, N. R., M. M. Prabu, J. Venkatraman, S. Suresh, and M. Vijayan. "X-ray Studies on Crystalline Complexes Involving Amino Acids and Peptides. XXXIII. Crystal Structures of L- and DL-Arginine Complexed with Oxalic Acid and a Comparative Study of Amino Acid–Oxalic Acid Complexes." Acta Crystallographica Section B Structural Science 54, no. 3 (June 1, 1998): 257–63. http://dx.doi.org/10.1107/s0108768197011543.

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The DL- and L-arginine complexes of oxalic acid are made up of zwitterionic positively charged amino acid molecules and semi-oxalate ions. The dissimilar molecules aggregate into separate alternating layers in the former. The basic unit in the arginine layer is a centrosymmetric dimer, while the semi-oxalate ions form hydrogen-bonded strings in their layer. In the L-arginine complex each semi-oxalate ion is surrounded by arginine molecules and the complex can be described as an inclusion compound. The oxalic acid complexes of basic amino acids exhibit a variety of ionization states and stoichiometry. They illustrate the effect of aggregation and chirality on ionization state and stoichiometry, and that of molecular properties on aggregation. The semi-oxalate/oxalate ions tend to be planar, but large departures from planarity are possible. The amino acid aggregation in the different oxalic acid complexes do not resemble one another significantly, but the aggregation of a particular amino acid in its oxalic acid complex tends to have similarities with its aggregation in other structures. Also, semi-oxalate ions aggregate into similar strings in four of the six oxalic acid complexes. Thus, the intrinsic aggregation propensities of individual molecules tend to be retained in the complexes.

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Dissertations / Theses on the topic "Oxalate ions"

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Bradley, Justin Michael. "Synthesis, structure and properties of oxalato and thio-oxalato molecule based magnets." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396147.

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Soldi-Lose, Héloïse. "Gas phase ion and radical chemistry of CO2 adducts with possible relevance in the atmosphere of Mars." Aachen Shaker, 2008. http://d-nb.info/991820215/04.

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Hamilton, Jenna Victoria. "On the Structure of Metal Oxalate Anions: Theory and Experiment." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32208.

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Anionic metal-oxalate complexes have been generated in the gas phase and an attempt at determining plausible structures were made. Two different experimental techniques were coupled to mass spectrometry: Infrared Multiphoton Dissociation (IRMPD) and ion mobility. Both techniques were compared to theoretical structures calculated using various levels of theory. With the use of IRMPD, frequencies were generated for each complex and compared to theoretical frequencies. Plausible structures for all complexes were found using the M-series of density functional levels of the theory when the 6-311+gd basis set was used and Bhandhlyp functional was appropriate for the lanl2dz basis set. Using ion mobility allowed for collision cross-sections to be calculated and compared to theoretical collision cross-sections of the various structures. Unfortunately no plausible structures were determined using this technique due to a lack of calibrants for the negative mode of ion mobility.

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Ahouari, Hania. "Exploration de nouveaux matériaux d'électrodes positives à base de polyanions carboxylates (oxalates, malonates et carbonates) et de métaux de transition." Thesis, Amiens, 2015. http://www.theses.fr/2015AMIE0027/document.

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Dans cette thèse, nous avons exploré toute une palette de composés à base de métaux de transition et de polyanions carboxylates (oxalates, malonates et carbonates) préparés via des procédés éco-efficaces. La synthèse du composé oxalate de fer (III) (Fe2(C2O4)3·4H2O) dont nous en avons élucidé pour la première fois la structure cristalline en combinant les techniques de diffraction des rayons X et neutrons, fait l'objet de la première partie de cette étude. Ce composé cristallise dans une maille triclinique (P -1) et il présente des propriétés électrochimiques intéressantes (98 mAh/g à 3.35 V vs. Li+/Li0). Dans cette quête pour de meilleurs matériaux, nous avons exploré la famille des oxalates Na2M2(C2O4)3·2H2O, dont la synthèse avait été déjà rapportée, mais sans qu'aucune activité électrochimique ne puisse être détectée. En revanche, le remplacement du groupement oxalate par un groupement malonate nous a permis d’obtenir pour la première fois plusieurs membres de la famille (Na2M(H2C3O4)2·nH2O (n=0, 2), M= Mn, Fe, Co, Ni, Zn et Mg) dont nous avons résolu leurs structures cristallines correspondantes. Cependant, comme dans le cas des oxalates, ces phases ne dévoilent aucune activité électrochimique vis-à-vis du lithium, bien qu'elles présentent des propriétés magnétiques intéressantes. Enfin nous avons conclu ce travail par la synthèse de composés appartenant à la famille des fluorocarbonates KMCO3F (M= Ca et Mn) en utilisant la voie tout solide. La phase au calcium, déjà rapportée dans la littérature, a fait l'objet d'une étude en température qui nous a permis de mettre en évidence pour la première fois la formation d'une phase haute température (KCaCO3F-HT), pour T≥320°C, dont nous avons résolu la structure. Finalement, l'utilisation du Mn au lieu du Ca a conduit à l'obtention d'une nouvelle phase (KMnCO3F) qui cristallise dans une maille hexagonale (P -6 c 2)
This thesis has focused on the exploration of new compounds based on 3d-metal and carboxylate polyanions (oxalates, malonates and carbonates) prepared through different sustainable synthetic approaches. In the first part, we report a new synthetic route to prepare the iron (III) oxalate compound (Fe2(C2O4)3·4H2O) and solve its crystal structure through combined X-ray and neutron powder diffraction. The compound crystallizes within a triclinic cell (P-1) and exhibits attractive electrochemical properties (98 mAh/g at 3.35 V vs. Li+/Li0). Motivated by this finding we pursued our quest for new positive electrode materials. We prepared by hydrothermal synthesis single crystals of sodium 3d-metal oxalates Na2M2(C2O4)3·2H2O, which are widely investigated in the literature for their magnetic properties. Unfortunately, these phases are electrochemically inactive versus lithium. Thereafter, we extended the synthesis towards the malonate family and we reported for the first time several members (Na2M(H2C3O4)2·nH2O (n= 0, 2), M= Mn, Fe, Co, Ni, Zn et Mg). These systems present rich crystal chemistry together with interesting antiferromagnetic properties but as in the case of the oxalates, they are not electrochemically active versus lithium. Finally, we synthesized two members of fluorocarbonates compounds KMCO3F (M= Ca and Mn) using solid state process. We succeeded in the preparation of the calcium member, already reported in the literature and we identified for the first time a phase transition at 320°C. The crystal structure of the high temperature phase (KCaCO3F-HT) was solved using neutron powder diffraction. A new manganese phase (KMnCO3F) was synthesized using the same technique and its crystal structure was solved by combining TEM, XR and neutrons powder diffraction techniques. This compound crystallizes within a hexagonal unit cell (P -6 c 2)

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Ghumman, Chaudhry Amjad Ali. "Time-of-flight secondary ion mass spectrometry: new application for urinary stones analysis." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/8796.

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au, A. Tromans@chem murdoch edu, and Andrew John Tromans. "Solution Chemistry of some Dicarboxylate Salts of Relevance to the Bayer Process." Murdoch University, 2001. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040730.140604.

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This thesis deals with certain aspects of the solution chemistry of the simple dicarboxylate anions: oxalate, malonate and succinate, up to high concentrations. These ions are either significant impurities in the concentrated alkaline aluminate solutions used in the Bayer process for the purification of alumina, or are useful models for degraded organic matter in industrial Bayer liquors. Such impurities are known to have important effects on the operation of the Bayer process. To develop a better understanding of the speciation of oxalate (the major organic impurity in Bayer liquors) in concentrated electrolyte solutions, the formation constant (Log£]) of the extremely weak ion pair formed between sodium (Na+) and oxalate (Ox2{) ions was determined at 25 oC as a function if ionic strength in TMACl media by titration using a Na+ ion selective electrode. Attempts to measure this constant in CsCl media were unsuccessful probably because of competition for Ox2{ by Cs+. Aqueous solutions of sodium malonate (Na2Mal) and sodium succinate (Na2Suc) were studied up to high (saturation) concentrations at 25 oC by dielectric relaxation spectroscopy (DRS) over the approximate frequency range 0.1 T £h/GHz T 89. To complement a previous study of Na2Ox, formation constants of the Na+-dicarboxylate ion pairs were determined and they were shown to be of the solvent-shared type. Both the Mal2{ and Suc2{ ions, in contrast to Ox2{, were also shown to possess large secondary hydration shells Apparent molal volumes (Vf) and heat capacities at constant pressure (Cpf) of aqueous solutions of Na2Ox, Na2Suc, Na2Mal and K2Ox were determined at 25 oC up to their saturation limits using vibrating tube densitometry and flow calorimetry. These data were fitted using a Pitzer model. The adherence of Vf and Cpf of various Na+ and K+ salts to Young¡¦s rule was examined up to high concentrations using the present and literature data. Young¡¦s rule was then used to estimate hypothetical values of Cpf and Vf for the sparingly soluble Na2Ox at high ionic strengths, which are required for the thermodynamic modelling of Bayer liquors. The solubility of Na2Ox in various concentrated electrolytes was measured, at temperatures from 25 oC to 70 oC in media both with (NaCl, NaClO4, NaOH) and without a common ion (KCl, CsCl, TMACl). The common ion effect was found to dominate the solubility of Na2Ox. The solubility of calcium oxalate monohydrate (CaOxªH2O) was also determined. The solubilities of both Na2Ox and CaOxªH2O in media without a common ion increased with increasing electrolyte concentration, except in TMACl media, where they decreased. The solubility of Na2Ox was modelled using a Pitzer model assuming the Pitzer parameters for Na2SO4 and minimising the free energy of the system. The data were modelled successfully over the full concentration and temperature range of all the electrolytes, including ternary (mixed electrolyte) solutions.

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Soares, Sandro Braga. "Fontes de lip?deos associados com ion?foro para cordeiros em confinamento." UFVJM, 2008. http://acervo.ufvjm.edu.br/jspui/handle/1/775.

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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Foi realizado um estudo avaliando a utiliza??o de duas fontes de lip?dio e uma ra??o controle, associadas a dois n?veis de monensina na alimenta??o de cordeiros. O ensaio de desempenho foi realizado no Setor de ovinocultura da Fazenda Experimental do Moura, Curvelo-MG, da Universidade Federal dos Vales do Jequitinhonha e Mucuri. Foram utilizados 36 cordeiros, 18 machos inteiros e 18 F?meas, Santa In?s x Texel, terminados em sistema intensivo, alimentados com seis dietas: dieta controle (RC), ?leo de soja (OS), gr?o de soja (GS), controle com adi??o de monensina (RC+M), ?leo de soja com adi??o de monensina (OS+M) e gr?o de soja com adi??o de monensina (GS+M). Os animais foram abatidos ap?s 87 dias de confinamento, sendo avaliados o desempenho, as caracter?sticas de carca?a, os pesos e percentagens dos componentes da carca?a e n?o carca?a. O ensaio de digestibilidade foi realizado nas depend?ncias do Laborat?rio de Pesquisa Animal da Universidade Federal de Lavras, sendo utilizadas18 borregas Santa In?s com 6 meses de idade e 29kg, confinadas em gaiolas de metabolismo por 21 dias, sendo 14 dias de adapta??o de 7 dias de coleta de fezes, urina, sobras e amostras de ra??o. Os tratamentos foram constitu?dos das ra??es citadas acima, e no pen?ltimo dia do per?odo experimental realizou-se a coleta de sangue dos animais para avalia??o de constituintes sangu?neos indicadores do metabolismo energ?tico, prot?ico e fun??o hep?tica. Os dados foram avaliados pelo procedimento GLM do SAS, e as m?dias comparadas e analisadas pelo teste de t a 5% de probabilidade. Houve superioridade no desempenho, consumo e digestibilidade dos animais que receberam dieta controle em rela??o aos animais que receberam gr?o de soja, sendo que a dieta com ?leo n?o diferiu da controle na maioria dos par?metros analisados. Os animais que receberam monensina apresentaram menores coeficientes de digestibilidade, menor consumo de todos os nutrientes analisados, menor desempenho e apresentaram ind?cios de problemas hep?ticos. Os machos tiveram desempenho e cortes mais pesados que as f?meas. N?o se recomenda o uso de monensina a 78 ppm em base da mat?ria seca para cordeiros em confinamento. O ?leo de soja n?o melhorou o desempenho, consumo e digestibilidade das dietas e o gr?o de soja, adicionado em 15% na mat?ria seca da ra??o, piorou esse par?metros.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2010.
ABSTRACT There was conducted a study to evaluate the use of two fat sources and a control diet, combined with two monensin levels on lambs feed. The performance test was accomplished at a sheep industry sector of the Federal University of the Jequitinhonha and Mucuri Valleys in the Moura Experimental Farm, Curvelo-MG. The work evaluated 36 lambs, 18 males and 18 females, Santa In?s x Texel finished in feedlot and fed with six diets: control diet (RC), soybean oil (SO), soybean (GS), control with monensin addition (CR + M), soybean oil with monensin addition (OS + M) and soybean with monensin addition (GS + M). The animals were slaughtered after 87 days of confinement, being evaluated for performance, carcass characteristics, weights and percentages of carcass and not carcass components. The digestibility trial was conducted on the premises of the Animal Research Laboratory of the Lavras Federal University evaluating 18 Santa Ines lambs with 6 months of age and 29kg, confined in metabolism cages for 21 days, being 14 days for adaptation counting 7 days of collection of feces, urine, and samples of feed. The treatments consisted of the diets mentioned above, and one day before the end of the experiment there was collected animals blood sampling for blood constituents evaluation, which are indicators of energy metabolism, protein and liver function. The data were analyzed by GLM procedure of SAS and the average were compared and analyzed by t test for 5% of probability. There were higher in performance, intake and digestibility of pigs fed with the control diet compared to animals fed with soybean, and oil diet did not differ from controls in most parameters. The animals fed with monensin had lower digestibility, lower consumption of all nutrients, lower performance and showed signs of liver problems. Males had cuts and performance heavier than females. There are not recommended the monensin use at 78 ppm in dry matter basis for confined lambs. Soybean oil has not improved performance, intake or digestibility of diets and the soybean, added 15% in the dry matter, worsened this parameters.

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Kekana, Paul Thabo. "Absorption of cobalt and nickel ions from sulphate media by oxalate-modified carbon pellets in a continuously stirred tank reactor." 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000583.

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M. Tech. Chemical Engineering.
Discusses the reactive properties of oxalate molecules on the surface of activated carbons (ACs) so that they can bind selectively with base metals. Therefore, the experimental plan covered three main axes of study: Chemical modification of AC adsorbent and characterization, adsorption studies in batch and continuous modes, and adsorption modelling.

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Metcalfe, Nigel Raymond. "Ion chromatographic studies of oxalate: Applications to neonatal parenteral nutrition." 2003. https://scholarworks.umass.edu/dissertations/AAI3096303.

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The development of nephrocalcinosis, the progressive formation and deposition of oxalate crystals in the kidneys, in premature infants is a relatively common and potentially serious condition. Although hyperoxaluria and hypercalciurea are both associated with the pathogenesis of nephrocalcinosis, it is believed that hyperoxaluria may be more important in enhancing the risk of calcium oxalate precipitation. Therefore, dietary measures to decrease urinary oxalate excretion in preterm infants may lead to decreased incidence of nephrocalcinosis. Total parenteral nutrition (TPN) solutions can act as a direct source of oxalate introduction into premature infants since they contain ascorbic acid (vitamin C) which is known to oxidize to oxalate in-vitro. Since increased urinary oxalate excretion has been reported in infants receiving TPN is was of clinical interest to be able to determine whether the infusion of TPN solutions into premature infants resulted in an unnecessary oxalate burden. A robust ion chromatographic method with suppressed conductivity detection was developed for the reliable determination of oxalate at part-per-million (ppm) levels in TPN solutions. An eluent system based on sodium carbonate and sodium bicarbonate was developed, permitting the separation and selective detection of oxalate from the major anionic components of the TPN matrix. The interference effect of method induced oxalate formation from ascorbate, which is known to hinder the determination of oxalate in TPN by currently available methodologies, was shown to be absent. The application of uncertainty in measurement was applied to ensure that a low level of experimental uncertainty was carried through to the obtained data. The effect of non-linear analyte response that is commonly reported when using carbonate and bicarbonate eluents with suppressed conductivity was evaluated. The deviation of calibration data from a linear response was found to be only very slight over the oxalate concentrations studied (0.2 ppm–30 ppm). The application of the developed method to the preliminary study of oxalate formation in TPN subjected to phototherapy conditions was successfully demonstrated.

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Lan, Yu Xiang, and 藍煜翔. "The Dissolution Kinetics of Various Metal Ion-Substituted Magnetite by Oxalate." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/36859909475549985131.

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碩士
國立中興大學
土壤環境科學系
93
How to apply the natural material to correct the environmental contamination and improve it’s recovery rate is a valuable subject to study at present. Because expect the impact on the environment can be reduced and when the natural material was retrieved after eliminating the pollution the secondary pollution can be prevented and the cost of the re-treatment can be reduced also. Magnetite has magnetism and the benefit of it is not only magnetically recyclable after using, but also useful in supplying the necessary electron transmission in chemical reactions because of the constitution of Fe2+ and Fe3+. XRPD (X-ray powder diffractometry), SQUID (suoerconducting quantum interference device), DRIFT-FTIR (Fourier-Transform Infrared Spectrometer), BET, and aqua regia digest method are used to identify the components and the characters of the synthesized ferrite in this study. During the substitution for magnetite, metal ions may be adsorbed on the surface of magnetite to modify the surface structure as well as it may enter inner structure of the formation of magnetite. Therefore, by the dissolution kinetics of oxalate, we study the effects of various metal ions and various proportion of metal ions contents on the formation of ferrite and the extraction for it. Furthermore, the ratio of metal to Fe for ferrite and the extraction content of metal and Fe by oxalate were dividually proceed multiple-regression-analysis with ionization energies, electronegativity and ionic radius parameters. The result presented the regression relationship was a trend variation distinctly following the increasing content of substituted metal ions in ratio of metal to Fe for ferrite and the extraction content of metal by oxalate. Our aims are to understand the behavior of various metal ion-substituted magnetites in the dissolution kinetics of oxalate and provide effective predicted parameters.

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Book chapters on the topic "Oxalate ions"

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Hackett, R. L., P. N. Shevock, and S. R. Khan. "Calcium Oxalate Crystals and Oxalate Ions are Injurious to Renal Epithelial Cells." In Urolithiasis 2, 325–27. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2556-1_116.

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Holze, Rudolf. "Transference numbers of oxalate ion in aqueous electrolyte solutions." In Electrochemistry, 1785. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1598.

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Holze, Rudolf. "Single ion conductivities of oxalate ion in aqueous electrolyte solutions at infinite dilution." In Electrochemistry, 2005. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1790.

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Turhan, Seval, Betül Usta, Yücel Şahin, and Oktay Uysal. "Determination of Oxalate Ion in Bayer Liquor Using Electrochemical Method." In Light Metals 2011, 215–17. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118061992.ch38.

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Turhan, Seval, Betül Usta, Yücel Şahin, and Oktay Uysal. "Determination of Oxalate Ion in Bayer Liquor Using Electrochemical Method." In Light Metals 2011, 215–17. Cham: Springer International Publishing, 2011. http://dx.doi.org/10.1007/978-3-319-48160-9_38.

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Holze, Rudolf. "Single ion conductivities of hydrogen oxalate ion in aqueous electrolyte solutions at infinite dilution." In Electrochemistry, 1883. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1668.

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Worrell, J. H., E. B. Kipp, and R. A. Haines. "Resolution of the (Ethylenediamine)bis(oxalato)cobaltate(III) Ion." In Inorganic Syntheses, 195–202. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132449.ch40.

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Larsson, L., B. Libert, and M. Asperud. "Determination of Urinary Oxalate by Reversed-Phase ION-Pair “High-Performance” Liquid Chromatography." In Urolithiasis and Related Clinical Research, 661–64. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-7272-1_141.

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Frank-Kamenetskaya, Olga V., Alina R. Izatulina, and Mariya A. Kuz’mina. "Ion Substitutions, Non-stoichiometry, and Formation Conditions of Oxalate and Phosphate Minerals of the Human Body." In Lecture Notes in Earth System Sciences, 425–42. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24987-2_33.

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Kauffman, George B., Nobuyuki Sugisaka, Ian K. Reid, and R. Kent Murmann. "Resolution of the Tris(Oxalato)Chromate(III) Ion by a Second-Order Asymmetric Synthesis." In Inorganic Syntheses, 139–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132562.ch33.

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Conference papers on the topic "Oxalate ions"

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Taranets, Y. V., O. N. Bezkrovnaya, I. M. Pritula, and P. V. Mateychenko. "Effect of the concentration of oxalate ions and L-aspartic acid on the morphology of the calcium oxalate monohydrate crystals." In 2016 International Conference on Nanomaterials: Application & Properties (NAP). IEEE, 2016. http://dx.doi.org/10.1109/nap.2016.7757278.

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Ou, Xiaoxia, Fengjie Zhang, and Lijun Deng. "The Effects of Inorganic Ions on Photodegradation of Humic Acids by Fe(III)/Oxalate Systems." In 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/iceep-17.2017.187.

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Werkelin, Johan, Maria Zevenhoven, Bengt-Johan Skrifvars, and Mikko Hupa. "Chemical Forms of Ash-Forming Matter in Woody Fuels for FBC." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78128.

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The prediction of the ash behavior in combustion processes is enhanced by the determination of the ash-forming matter in the fuel. The scope of this work was to characterize Scandinavian wood fuels by studying the wood, bark and leaves from a spruce and an aspen. Chemical Fractionation, a step-wise leaching procedure that treat the fuel in water, ammonium acetate and hydrochloric acid, was used to determine the solubility of the ash elements. The resulting solutions were further analyzed on ionic species, which was coupled to the presence of salt compounds in the original biomass tissues. The leaching procedure dissolved nearly 100% of the ash-forming matter. The phosphorus (P), chlorine (Cl) and some of the sulfur (S) were readily leached with water and found present as HPO42−, SO42− and Cl− in the solutions. The simultaneous dissolving of potassium (K) in this step proved the presence of water soluble potassium salts in the biomasses. The remaining K after the water treatment and all magnesium (Mg) dissolved completely in the ammonium acetate step together with a large part of the tissues’ calcium (Ca) and manganese (Mn). The remaining Ca after the second step was leached in hydrochloric acid together with equivalent amounts of oxalate ions, C2O42−. This proved the presence of acid soluble calcium oxalate in the tissues, a salt with low solubility in neutral pH.

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Jumari, Arif, Khikmah Nur Rikhy Stulasti, Refarmita Nur Halimah, Agus Purwanto, Luthfiatul Azizah Aini, and Rahmawati Mintarsih. "Production of LiNi0.6Mn0.2Co0.2.2O2 via fast oxalate precipitation for Li-ion." In THE 5TH INTERNATIONAL CONFERENCE ON INDUSTRIAL, MECHANICAL, ELECTRICAL, AND CHEMICAL ENGINEERING 2019 (ICIMECE 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000646.

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Miyagi, Atsuko. "Alteration of oxalate content in rice leaves obtained from ion beam-irradiated plants." In ASPB PLANT BIOLOGY 2020. USA: ASPB, 2020. http://dx.doi.org/10.46678/pb.20.561315.

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Kalfaoğlu, Emel, and Bünyamin Karabulut. "Theoretical and experimental studies of the molecular orbital bonding coefficients for Cu2+ ion in cesium hydrogen oxalate single crystals." In 9TH INTERNATIONAL PHYSICS CONFERENCE OF THE BALKAN PHYSICAL UNION (BPU-9). AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4944148.

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Reports on the topic "Oxalate ions"

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Coleman, C. J. Method to Determine Oxalate in High-Level Sludge by Ion Chromatography. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/806911.

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