ISO 5961:1994
$19.50
Qualité de l’eau — Dosage du cadmium par spectrométrie d’absorption atomique
| Published By | Publication Date | Number of Pages |
| ISO | 1994-01 | 16 |
La présente Norme internationale prescrit deux méthodes de dosage du cadmium: par spectrométrie d'absorption atomique dans la flamme (section 2), et par spectrométrie d'absorption atomique avec atomisation électrothermique (section 3). 1.1.1 Dosage du cadmium dans une flamme air/acétylène Cette méthode s'applique à l'analyse des eaux et des eaux usées pour des concentrations de cadmium comprises entre 0,05 mg/l et 1 mg/l. Un dosage à de plus fortes concentrations est possible par dilution de l'échantillon. La gamme de travail de cette méthode peut être étendue à de plus faibles concentrations en procédant à une évaporation minutieuse de l'échantillon, préalablement acidifié à l'aide d'acide nitrique. Le cadmium peut être déterminé dans les boues et sédiments après une procédure de digestion appropriée évitant la formation d'un précipité. 1.1.2 Dosage du cadmium par atomisation électrothermique La méthode permet de doser le cadmium dans l'eau. Avec un volume de dosage de 10 µl, la gamme de concentration est comprise entre 0,3 µg/l et 3 µg/l. La gamme de concentration peut être étendue en diluant l'échantillon d'eau ou en utilisant de plus petits volumes de dosage. Le cadmium peut être dosé dans les boues et sédiments après une procédure adéquate de digestion.
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