Search Results - "Choppin, G. R"

Actinide speciation in the environment by Choppin, G R

“…Nuclear test explosions and nuclear reactor wastes and accidents have released large amounts of radioactivity into the environment. Actinideions in waters…”
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Thermodynamic and Spectroscopic Studies of Lanthanides(III) Complexation with Polyamines in Dimethyl Sulfoxide by Di Bernardo, P, Zanonato, P. L, Melchior, A, Portanova, R, Tolazzi, M, Choppin, G. R, Wang, Z

“…The thermodynamic parameters of complexation of Ln(III) cations with tris(2-aminoethyl)amine (tren) and tetraethylenepentamine (tetren) were determined in…”
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Complexation of Eu(III), Am(III) and Cm(III) with Dicarboxylates: Thermodynamics and Structural Aspects of the Binary and Ternary Complexes by Thakur, P., Pathak, P. N., Gedris, T., Choppin, G. R.

“…The complexation of Eu(III), Am(III) and Cm(III) with dicarboxylate anions with O, N or S donor groups was measured in I =6.60 mol⋅kg −1 (NaClO 4 ) at…”
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Mixed Ligand Complexes of Am3+, Cm3+ and Eu3+ with HEDTA and HEDTA + NTA—Complexation Thermodynamics and Structural Aspects by Thakur, P., Conca, J. L., Choppin, G. R.

“…The stability constants and the associated thermodynamic parameters of formation for the 1:1 binary complexes of Am 3+ , Cm 3+ and Eu 3+ with…”
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Thermodynamic Stability and Kinetic Inertness of MS-325, a New Blood Pool Agent for Magnetic Resonance Imaging by Caravan, P, Comuzzi, C, Crooks, W, McMurry, T. J, Choppin, G. R, Woulfe, S. R

“…Stability constants were measured for complexes formed between a modified DTPA ligand and the metal ions Gd(III), Eu(III), Fe(III), Ca(II), Cu(II), and Zn(II)…”
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Spectroscopic and chemical characterizations of molecular size fractionated humic acid by Shin, Hyun-Shang, Monsallier, Jean Marc, Choppin, Gregory R

“…A sample of humic acid was divided by ultrafiltration into five fractions of different molecular size (F1; 300 000: F2; 100 000–300 000: F3; 50 000–100 000:…”
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Radionuclide separations in radioactive waste disposal by Choppin, G R, Morgenstern, A

“…Radionuclide separation processes that have been used successfully in the past as well as recent developments in separation techniques are discussed with…”
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THERMODYNAMICS OF SOLVENT EXTRACTION by Choppin, G. R., Morgenstern, A.

“…The fundamental thermodynamic characteristics of aqueous electrolyte solutions and organic solutions which affect solvent extraction are summarized and the…”
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Coordination Modes in the Formation of the Ternary Am(III), Cm(III), and Eu(III) Complexes with EDTA and NTA:  TRLFS, 13C NMR, EXAFS, and Thermodynamics of the Complexation by Mathur, J. N, Thakur, P, Dodge, C. J, Francis, A. J, Choppin, G. R

“…The formation and the structure of the ternary complexes of trivalent Am, Cm, and Eu with mixtures of EDTA+NTA (ethylenediamine tetraacetate and…”
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Uranyl Ion Extraction into Room Temperature Ionic Liquids: Species Determination by ESI and MALDI-MS by Murali, M. S., Bonville, N., Choppin, G. R.

“…The extraction of uranyl nitrate by TBP in two room temperature ionic liquids (RTILS), viz. 1-alkyl-3 -methyl imidazolium (C n mim, n = 4 and 8) cation with…”
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Carbon-13 NMR spectroscopic studies on chemically modified and unmodified synthetic and natural humic acids by Sachs, S, Bubner, M, Schmeide, K, Choppin, G.R, Heise, K.H, Bernhard, G

“…Carbon-13 cross-polarization magic-angle spinning nuclear magnetic resonance spectroscopy ( 13C-CP/MAS-NMR) was applied to study the chemical modification…”
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Actinide speciation in aquatic systems by Choppin, Gregory R.

“…Nuclear test explosions and reactor wastes have deposited an estimated 16 × 10 15 Bq of plutonium into the world's aquatic systems. However, plutonium…”
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Hydration Number of Tris[1-(2-thienyl)-4,4,4- trifluoro-1,3-butanedionato]lanthanoids in Chloroform across the Lanthanoid Series by Hasegawa, Yuko, Ishiwata, Eiichi, Ohnishi, Tadahiro, Choppin, G. R

“…The hydration numbers of lanthanoid(III) chelates with 2-thenoyltrifluoroacetone prepared by extracting into chloroform have been determined by analyzing the…”
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Extraction and mutual separation of actinide(III), (IV), (V) and (VI) ions by N,N'-dimethyl-N,N'-dihexyl-3-oxapentanediamide and thenoyltrifluoroacetone by Sasaki, Y.,-, Choppin, G R

“…Actinide(III), (IV), (V) and (VI) ions were extracted by N.N'- dimethyl-N,N'-dihexyl-3-oxapentanediamide (DMDHOPDA) and thenoyltrifluoroacetone (HTTA). The…”
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Redox speciation of plutonium by Choppin, G. R., Bond, A. H., Hromadka, P. M.

“…The oxidation state distribution of plutonium is an important factor in aquatic systems from the point of view of estimating the plutonium residence period…”
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Redox speciation of plutonium in natural waters by CHOPPIN, G. R

“…To ascertain the range of conditions of pH, ionic strength for which plutonium(V) (the dominant oxidation state of trace concentrations of plutonium in natural…”
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Humic acids coagulation: influence of divalent cations by Wall, Nathalie A., Choppin, Gregory R.

“…The effects of the ionic strength (maintained by LiCl, NaCl or KCl) and Ca 2+ and Mg 2+ concentration on the coagulation of purified humic acids (HA) was…”
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Complexation thermodynamics and structural aspects of actinide–aminopolycarboxylates by Choppin, G.R., Thakur, P., Mathur, J.N.

“…The interaction of trivalent actinides with aminopolycarboxylate ligands in aqueous solution is reviewed. The strength of complexation to form binary and…”
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Uranyl Coordination Environment in Hydrophobic Ionic Liquids:  An in Situ Investigation by Visser, Ann E, Jensen, Mark P, Laszak, Ivan, Nash, Kenneth L, Choppin, Gregory R, Rogers, Robin D

“…Different inner-sphere coordination environments are observed for the uranyl nitrate complexes formed with octyl-phenyl-N,N-diisobutylcarbamoylmethylphosphine…”
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Sorption of Am cations on suspended silicate: Effects of pH, ionic strength, complexing anions, humic acid and metal ions by Pathak, P N, Choppin, G R

“…Sorption of tracer Am to silicate particles was studied as a function of pcH (4 to 9) and of ionic strength [0.20M to 1.50M (NaClO4)] at 298 K. The sorption…”
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