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Polarographische Bestimmung von uranspuren in phosphaten mittels ionenaustausches.
1960
Abstracts
Section
A 97
ions, is also found to be influenced by the addition of different varieties of chromic chloride to the chromous chloride. The latter change is interesting in so far as a temporary increase, instead of a decrease, in potential is observed and it takes some time for the electrode system to regain equilibrium. The behaviour of a variety of chromic chloride solutions at the dropping Hg electrode has been studied. It is noted that a fresh solution of green hydrate is most easily reducible (El/a = -0.8V) and the sample obtained by the aerial oxidation of blue chromous chloride is most difficultly reducible (El/z = -1.2 V). R. S. Sa. t3121 THE BEHAVIOUR OF Cr(I1) AND Cr(II1) AT THE DROPPING MERCURY ELECTRODE. II. ANODIC WAVE OF Cr(II) IN PRESENCE OF ACIDS, SALTS AND COMPLEXING AGENTS. K. M. Abubacker and W. U. Malik. (Muslim University, Aligarh, India. ) J. Indian Chem. Sot. , 36 (1959) 463. The anodic waves of Cr(II) obtained by the reduction of the green hydrate with Zn and HCl, and that of the chromous-chromic mixture obtained by oxidising chromous_ chloride to different degrees by Hz@ have been studied._The anodic wave of Cr(I1) and the cathodic wave of Cr(II1) show irreversibility. Cr(I1) ions are. not oxidised in the presence of supporting electrolytes such as tartrate and oxalate. With citrate the polarogram obtained is typical. Well defined but irreversible waves are obtained with HCl, NH4C1, KC1 + HCl, and H@O4. The presence of @ or Cl- is essential for good utility of chromous chloride as a reducing agent. R. S. Sa. [3131 THE POLAROGRAPHIC BEHAVIOUR OF CHROMAMINES AND CHROMIUM (III) SALTS IN AN ACETATE BUFFER. J. A. Friend and P. W. Smith. (Dept. of Chemistry, University of Tasmania, Hobart, Tasmania.) J. Phys. Chem., 63 (1959) 314. The polarographic reduction of 9 chromammines has been carried out in an 0.1 M sodium acetate and acetic acid electrolyte. In this electrolyte most of the chromammines yielded double waves, the heights of the successive steps of which were in the approximate ratio 1:2. The half-wave potentials are given for the different ammines. These appear to indicate that the hexaquochromium ions has approximately the same reduction potential as the hexammine under the same conditions. D. S. Ru. [3141
POLAROGRAPHISCHE BESTIMMUNG VON URANSPUREN IN PHOSPHATEN MITTELS IONENAUSTAUSCHES. Fathi Habaschi. (Institut fur anorganlsche Technologie, Techn. Hochschule, Wien, Ostreich. ) Mikrochim, Acta, 6 (1959) 932. Fiir die Bestimmung geringer Uranmengen in Gegenwart ilberschdssiger Phosphors%tre wurde eine geeignete Analysenvorschrift ausgearbeitet. Durch Zusatz von SchwefelsZure zur phosphorsauren L&sung wird Uran in einen anionisch geladenen Uranylsulfatkomplex ilbergefiihrt, der in einer MikrosPule an den Anionenaustauscher Amberlite IRA - 400 gebunden wird, wahrend Phosphors%tre und andere Verunreinigungen abfliessen. Nach Eluation mit 1 N HCl, Eindampfen zur Trockene und Vertreibung der SchwefelsZure wird der Riickstand in 0.01 N HNOa aufgenommen und polarographiert. Urankonzentrationen bis zu 0.01 wg/ml lassen sich polarographisch mittels einer von Uran katalysierten Nitratreduktionswelle bestimmen. Ed. Bro. [3151
POLAROGRAPHIC STUDY OF ICl IN AQUEOUS SOLUTIONS OF CHLORIDE IONS, I. HYDROLYSIS (in Spanish). J. S. Gomez and J. O.Abellan. (“A. de G. Rocasolane” Institute of Phys. Chem. , Murcia, Spain.) Anales fis. y quim. (Madrid), 55B (1959) 515.
Abstracts
Section
A 97
ions, is also found to be influenced by the addition of different varieties of chromic chloride to the chromous chloride. The latter change is interesting in so far as a temporary increase, instead of a decrease, in potential is observed and it takes some time for the electrode system to regain equilibrium. The behaviour of a variety of chromic chloride solutions at the dropping Hg electrode has been studied. It is noted that a fresh solution of green hydrate is most easily reducible (El/a = -0.8V) and the sample obtained by the aerial oxidation of blue chromous chloride is most difficultly reducible (El/z = -1.2 V). R. S. Sa. t3121 THE BEHAVIOUR OF Cr(I1) AND Cr(II1) AT THE DROPPING MERCURY ELECTRODE. II. ANODIC WAVE OF Cr(II) IN PRESENCE OF ACIDS, SALTS AND COMPLEXING AGENTS. K. M. Abubacker and W. U. Malik. (Muslim University, Aligarh, India. ) J. Indian Chem. Sot. , 36 (1959) 463. The anodic waves of Cr(II) obtained by the reduction of the green hydrate with Zn and HCl, and that of the chromous-chromic mixture obtained by oxidising chromous_ chloride to different degrees by Hz@ have been studied._The anodic wave of Cr(I1) and the cathodic wave of Cr(II1) show irreversibility. Cr(I1) ions are. not oxidised in the presence of supporting electrolytes such as tartrate and oxalate. With citrate the polarogram obtained is typical. Well defined but irreversible waves are obtained with HCl, NH4C1, KC1 + HCl, and H@O4. The presence of @ or Cl- is essential for good utility of chromous chloride as a reducing agent. R. S. Sa. [3131 THE POLAROGRAPHIC BEHAVIOUR OF CHROMAMINES AND CHROMIUM (III) SALTS IN AN ACETATE BUFFER. J. A. Friend and P. W. Smith. (Dept. of Chemistry, University of Tasmania, Hobart, Tasmania.) J. Phys. Chem., 63 (1959) 314. The polarographic reduction of 9 chromammines has been carried out in an 0.1 M sodium acetate and acetic acid electrolyte. In this electrolyte most of the chromammines yielded double waves, the heights of the successive steps of which were in the approximate ratio 1:2. The half-wave potentials are given for the different ammines. These appear to indicate that the hexaquochromium ions has approximately the same reduction potential as the hexammine under the same conditions. D. S. Ru. [3141
POLAROGRAPHISCHE BESTIMMUNG VON URANSPUREN IN PHOSPHATEN MITTELS IONENAUSTAUSCHES. Fathi Habaschi. (Institut fur anorganlsche Technologie, Techn. Hochschule, Wien, Ostreich. ) Mikrochim, Acta, 6 (1959) 932. Fiir die Bestimmung geringer Uranmengen in Gegenwart ilberschdssiger Phosphors%tre wurde eine geeignete Analysenvorschrift ausgearbeitet. Durch Zusatz von SchwefelsZure zur phosphorsauren L&sung wird Uran in einen anionisch geladenen Uranylsulfatkomplex ilbergefiihrt, der in einer MikrosPule an den Anionenaustauscher Amberlite IRA - 400 gebunden wird, wahrend Phosphors%tre und andere Verunreinigungen abfliessen. Nach Eluation mit 1 N HCl, Eindampfen zur Trockene und Vertreibung der SchwefelsZure wird der Riickstand in 0.01 N HNOa aufgenommen und polarographiert. Urankonzentrationen bis zu 0.01 wg/ml lassen sich polarographisch mittels einer von Uran katalysierten Nitratreduktionswelle bestimmen. Ed. Bro. [3151
POLAROGRAPHIC STUDY OF ICl IN AQUEOUS SOLUTIONS OF CHLORIDE IONS, I. HYDROLYSIS (in Spanish). J. S. Gomez and J. O.Abellan. (“A. de G. Rocasolane” Institute of Phys. Chem. , Murcia, Spain.) Anales fis. y quim. (Madrid), 55B (1959) 515.