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Original Title
Nachal'nye i statsionarnye potentsialy ehlektroliticheskogo reniya i splava renij-nikel'
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Journal Article
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Progress Report
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Zashch. Metal; v. 6(5); p. 535-536
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AbstractAbstract
[en] A potentiometric titration of 5 to 25 mg uranium is described. Sulphamic and phosphoric acid are added to the sample (volume 1 ml), U VI is reduced to U IV by Fe2+ and the excess of Fe2+ is oxidized by a mixture of nitric acid, sulphamic acid and ammonium molybdate; vanadyl sulphate is added to ensure a sharp end-point of the titration. The resultant U IV is titrated automatically with 0.02500N potassiumdichromate using a platinum indicator electrode. The automatic titration is performed both with a commercial titrator (Mettler) and with an R.C.N. titrator which waits after each addition until the equilibrium is reached. Using the Mettler titrator an accuracy of 0.05% relative was reached. The R.C.N. setpoint titrator gave results with an accuracy of 0.04% relative at the 20-mg U level. Each titration takes 5 to 7 min. (author)
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Source
International Atomic Energy Agency, Vienna (Austria); Proceedings series; v. 2 p. 157-163; ISBN 92-0-070176-0;
; 1976; IAEA; Vinna; Symposium on the safeguarding of nuclear materials; Vienna, Austria; 20 Oct 1975; IAEA-SM--201/65

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Book
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Conference
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Silver, G.L.
Mound Lab., Miamisburg, Ohio (USA)1977
Mound Lab., Miamisburg, Ohio (USA)1977
AbstractAbstract
[en] Geometric optimization techniques useful for studying chemical equilibrium traditionally rely upon principles of euclidean geometry, but such algorithms may also be based upon principles of a non-euclidean geometry. The sequential simplex method is adapted to the hyperbolic plane, and application of optimization to problems such as the potentiometric titration of plutonium is suggested
Original Title
Application to potentiometric titration of Pu
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Source
15 Aug 1977; 30 p; Available from NTIS., PC A03/MF A01
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Report
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AbstractAbstract
[en] A potentiometric study on the complex formation of Cu(II) and UO2(II) with dimethyl diisoxazolone (RH) in (1:1) water-dioxan at a constant ionix strength (μ=0.5) at 31 +- 0.5deg, has been made. The successive formation constants K1 and K2 have been determined following Irving and Rossotti method. Log K1 and log K2 are computed by graphical methods and are found to be 1.72, 1.61; 1.61,1.23 for Cu(II) and UO2(II) respectively. The acid dissociation constant ksup(*) of RH has also been determined in (1:1) water-dioxane as well as in (1:1) water-methanol are found to be pksup(*)=2.88 and 2.40 respectively. (author)
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Journal Article
Journal
Journal of the Indian Chemical Society; v. 53(8); p. 779-780
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Madden, M.L.
Oklahoma State Univ., Stillwater (USA)1972
Oklahoma State Univ., Stillwater (USA)1972
AbstractAbstract
No abstract available
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Source
May 1972; 74 p; Thesis.
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Report
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AbstractAbstract
[en] The recent advances in the theory and practice of potentiometric, conductometric and optical sensors based on ionophores are critically reviewed. The role of the heterogeneity of the sensor/sample systems is emphasized, and it is shown that due to this heterogeneity such sensors respond to the analyte activities rather than to concentrations. The basics of the origin of the response of all three kinds of ionophore-based sensors are briefly described. The use of novel sensor materials, new preparation and application techniques of the sensors as well as advances in theoretical treatment of the sensor response are analyzed using literature sources published mainly from 2012 to 2014. The basic achievements made in the past are also addressed when necessary for better understanding of the trends in the field of ionophore-based sensors. The bibliography includes 295 references
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Source
Available from http://dx.doi.org/10.1070/RCR4506; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Russian Chemical Reviews (Print); ISSN 0036-021X;
; v. 84(6); p. 555-578

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AbstractAbstract
[en] The original Macdonald and Savage amperometric method scaled down to milligram-sized plutonium samples was further modified. The electro-chemical process of each redox step and the end-point of the final titration were monitored potentiometrically. The method is designed to determine 4 mg of plutonium dissolved in nitric acid solution. It is suitable for the direct determination of plutonium in non-irradiated fuel with a uranium-to-plutonium ratio of up to 30. The precision and accuracy are ca. 0.05-0.1% (relative standard deviation). Although the procedure is very selective, the following species interfere: vanadyl(IV) and vanadate (almost quantitatively), neptunium (one electron exchange per mole), nitrites, fluorosilicates (milligram amounts yield a slight bias) and iodates. (author). 15 refs.; 8 figs.; 7 tabs
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Journal Article
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Numerical Data
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AbstractAbstract
[en] After having determined the formation constants of anthranilic acid, the anthranilic acid-Be2+ - H2O system (0.5 M NaClO3 and t=25 deg C) has been studied. The complex BeA+ and the hydroxylated species Be2(OH)A2+, Be3(OH)3A2+, Be3(OH)3A2+ have been identified
[fr]
Apres avoir determine les constantes de formation de l'acide anthranilique, on etudie par potentiometrie le systeme acide anthranilique - Be2+ - H2O(NaClO4, 0,5 M et t=25 deg C). On identifie le complexe BeA+ et les especes hydroxylees Be2(OH)A2+, Be3(OH)3A2+, Be3(OH)3A2+Original Title
Contribution a l'etude des complexes du beryllium. V. - Chelation des ions Be2+ par l'acide anthranilique
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Journal Article
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Bull. Soc. Chim. Fr., Part 1; (no.3); p. 495-499
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AbstractAbstract
[en] The determination of 800 to 30 μg Pb(II) by potentiometric titration with molybdate by using a lead(II)-selective electrode was investigated. Under suitable conditions, 800 to 300 μg Pb(II) in aqueous solution by automatic or manual titration with 4x10-3 M molybdate can be determined with an accuracy of +-0.57% and +-0.45% and a precision of +-0.43% and 0.30% (standard deviation = 0.25% and 0.17%, resp.). For determining amounts of Pb(II) below 300 μg, a 2x10-3 M molybdate solution has to be used. Although 300 to 100μg Pb(II) are determinable again in water with satisfactory results, the titration in 40% ethanol is however more reliable: in this medium, amounts of 300 to 30μg Pb(II) can be determined with an accuracy of +-1% and a precision of +-2% (standard deviation from 20 titrations of 100μg Pb(II)=0.60%). The titration of 300-800μg Pb(II) in water and of 30-300μg Pb(II) in 40% ethanol is also possible in 0.1 M NaNO3sub- snd 0.1 M NaClO4sub- medium and can be used in the lead determination in organic compounds after mineralization with HNO3sub-HClO4sub-H2O2. (Author)
Original Title
Die Bestimmung von 800 bis 30 μg Blei(II) durch potentiometrische Titration mit Molybdat
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Journal Article
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Sad, C.M.S.; Vicente, M.A.; Filgueiras, P.R.; Medeiros, E.F.; Castro, E.V.R.; Dias, J.C.M.
36. Colloquium Spectroscopicum Internationale2009
36. Colloquium Spectroscopicum Internationale2009
AbstractAbstract
[en] Complete text of publication follows. Current methods adopted by the petroleum industry for salinity determination in production water are environmentally impacting due to chemical residue generation. Potenciometric assay ASTMD 6470-99 as well as classical gravimetric methods are recommended for salinity determination in petroleum and its production water; however, high treatment and recovery cost residues are generated by these methods demanding. Clean oil production is a rather attractive approach which might result in more efficient processes whit less environmental damage and reduction on costs of production within this context, development of methods which contem plate high accuracy, low operational and environmental costs are in high demand. The purpose of this study is the determination of salinity in petroleum water formation through an environmental impact less method which is based on the linear combination of density and conductivity measurements. Density, gravimetric and conductometric analysis of 35 test samples of petroleum water formation from two different fields from Espirito Santo sedimentary basin located in Brazilian southeastern continental margin, collected in 2008 were determined. From these data a Partial Least Square (PLS) calibration model was built which showed satisfactory agreement between the classical method determination of salinity (gravimetry) and the linear combination of density and conductivity. In conclusion, method showed excellent results comparable to the classical and instrumental methods with additional advantages such as accurate results, low cost and mainly without generation of chemical residues inherent to the classical analytical process.
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Hungarian Chemical Society (Hungary); Hungarian Spectrochemical Association of Hungarian Chemical Society (Hungary); Eoetvoes Lorand University (Hungary); [373 p.]; 2009; p. 321; 36. Colloquium Spectroscopicum Internationale; Budapest (Hungary); 30 Aug - 3 Sep 2009; Available from http://www.csixxxvi.org/
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