Microdosage de traces de cobalt dans les ciments par spectrophotométrie

Haerdi, W.; Vogel, Jon D.; Monnier, D.

doi:10.1016/0003-2670(61)80070-6

Cited by 3 publications

References 9 publications

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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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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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Die Bestimmung einzelner Elemente

Koch¹,

Koch-Dedic²

1964

Handbuch Der Spurenanalyse

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Solubility of cobalt in cement

Fregert

Gruvberger

1978

Contact Dermatitis

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Unlike chromate, cobalt occurring as cobalt oxides in cement is not water-soluble in a detectable amount. Cobalt oxides are to some extent soluble in the presence of amino acids with which cobalt forms complexes. Such complexes can elicit patch test reactions. It is postulated that cobalt is more readily dissolved by forming complexes in eczematous skin than in normal skin. This may explain why cobalt sensitization in cement eczemas is secondary to chromate sensitivity.

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Microdosage de traces de cobalt dans les ciments par spectrophotométrie

Cited by 3 publications

References 9 publications

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

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

Die Bestimmung einzelner Elemente

Solubility of cobalt in cement

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