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  • Author or Editor: F. Mousty x
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Abstract  

A destructive method for the measurement of impurities in high purity zinc by neutron activation analysis is described. It essentially uses organic resins and inorganic exchangers for the separations. Sensitivities at the ppb level are obtained for a high number of elements.

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Résumé  

Cet article traite de l'utilisation d'échangeurs minéraux dans l'analyse destructive de matériaux de grande pureté, en particulier pour la détermination systématique d'un grand nombre d'éléments. On indique brièvement des améliorations récentes dans la méthode permettant d'évaleur mathématiquement les modes de séparation radiochimique à l'aide des échangeurs minéraux. On décrit les modes de séparation dans le cas du dosage des impuretés dans de l'aluminium et du zinc de haute pureté. Les résultats pour plusieurs échantillons de zinc obtenus par purifications successives sont donnés, ces résultats mettent en évidence l'évolution de la distribution des différentes impuretés. On présente aussi les résultats obtenus dans le cas d'un échantillon de zinc choisi comme étalon.

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Abstract  

The possibility to use the bronchoalveolar lavage (BAL) in combination with analytical methods for trace metal analysis such as neutron activation analysis (NAA), inductively coupled plasma (ICP) and electrothermal atomic absorption spectroscopy (ETASS) for the determination of trace elements in the lung of living subjects has been investigated. In particular more than 30 elements have been determined: (1) in physiological solutions used for bronchopulmonary lavage (blank values) (2) in BALs of volunteer patients (unexposed subjects) (3) in BALs of occupational workers affected by pulmonary fibrosis as diagnosed by clinical methods (exposed subjects). Although the number of cases with metal exposure studied by NAA-BAL method is too limited to draw definitive conclusions the results suggest that the procedure can provide interesting qualitative information on metals which would be actually retained in the lung tissue. However, although the method may become of importance when integrated with clinical examinations further investigations are necessary to establish qualitative relations between trace metal levels determined in the BAL and the total elemental content of the lung tissue.

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