Macro‐ et microdosage de traces de cobalt VII. Microdosage polarographique, spectrophotométrique et par activation aux neutrons, du cobalt dans une fonte. Etude comparative

The assay of traces of cobalt 60 by the method of recording spectra, using a one canal gamma spectrometer, has been completely investigated. The interferences due to iron 59 and cobalt 58 have been studied in detail. A method is described for the direct assay (without dissolution or separation) of cobalt in inconel by activation by thermal neutrons. This determination can still be effected readily on only 0,1 mg of this alloy. The method is rapid, simple and sensitive.

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Macro‐ et microdosage de traces de cobalt. VIII. Dosage direct du cobalt dans l'inconel, par activation aux neutrons thermiques; limites de dosage et interférences

Haerdi

Vogel

Monnier

1960

Helvetica Chimica Acta

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Etude préliminaire au dosage des éléments par activation aux neutrons, basé sur la formation d'isotopes à courte période: séparations rapides et détermination des pertes

Monnier

Haerdi

Vogel

1961

Helvetica Chimica Acta

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The authors submit a method for the rapid separation of cobalt by toluene extraction of its β‐nitroso‐α‐naphthol complex, with estimation of the losses involved. Iron, the chief element causing disturbance in assay by gamma spectrometry (60Co) after activation, gives a complex with sodium fluoride‐acetate‐citrate in a medium at pH 5–6 and remains quantitatively in the aqueous phase. In this way it has been possible to separate 0,1 μg of cobalt in presence of 100 mg of iron. The estimation of losses is carried out by means of a radioactive tracer (58Co), isotope of the element being assayed (cobalt 60 or 60 m). The time necessary for separation and estimation is about 20 min and would thus permit a cobalt assay based on that of the cobalt 60 m (periode 10,5 min) wich is formed by activation. A chemical method for the control of losses has also been studied.

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Analyse radiochimique par activation aux neutrons thermiques: Dosage du cobalt par mesure de l'activité du cobalt 60m (période de 10,5 minutes)

Monnier

Haerdi

Vogel

1961

Helvetica Chimica Acta

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Volumen XLIV, Fasciculus VI (1961) (-) -1-(p-Chlorostyryl-2-acetyl-6,7-dimethoxy-l, 2,3,4-tetrahydro-isoquinoline (IX), which has the same configuration as the analgetic substance (-)-Ro 4-1778/1 (I), has been correlated with (+)-calycotomine (V) of known absolute configuration. Thus the absolute configuration of (-)-I as (R)-l-(p-chlorophenethyl)-2-methyl-6,7-dimethoxy-l,2,3,4-tetrahydro-isoquinoline is proved. This result is supported by rotatory dispersion studies and by the rotation shifts in solvents of different polarity. The physicochemical data of optically pure (+)-calycotomine (V) do not correspond with those recorded for the optically active alkaloid as isolated by WHITE, which seems to be a mixture of (+)-calycotomine and its racemate.

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Macro‐ et microdosage de traces de cobalt VII. Microdosage polarographique, spectrophotométrique et par activation aux neutrons, du cobalt dans une fonte. Etude comparative

Abstract: Le microdosage par polarographie, par spectrophotométrie et par activation aux neutrons thermiques est appliqué à la détermination de la teneur en cobalt d'une fonte. Une étude comparative des trois procédés est faite.

Cited by 7 publications

References 6 publications

Macro‐ et microdosage de traces de cobalt. VIII. Dosage direct du cobalt dans l'inconel, par activation aux neutrons thermiques; limites de dosage et interférences

Macro‐ et microdosage de traces de cobalt. VIII. Dosage direct du cobalt dans l'inconel, par activation aux neutrons thermiques; limites de dosage et interférences

Etude préliminaire au dosage des éléments par activation aux neutrons, basé sur la formation d'isotopes à courte période: séparations rapides et détermination des pertes

Analyse radiochimique par activation aux neutrons thermiques: Dosage du cobalt par mesure de l'activité du cobalt 60m (période de 10,5 minutes)

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