Validation de la methode d'etalonnage en couche mince par utilisation de geostandards deposes sur filtres pour l'analyse elementaire par SFX

摘要

The calibration of the analyse of atmospheric thin films par XRF classically uses synthetic deposit of salt solutions on blanks filters. The validation of this procedure is currently made by comparison with the analyse by atomic absorption (AAS) on metals and after mineralisation. This procedure cannot simultaneously check elements as Si, Al, Ca, Ti and Fe. For this purpose, we developed a calibration method using deposits of geostandards on filters and specific synthetic deposits of solutions. For that, we use inert fluid as cyclohexane and a geometry of the liquid filtrator exactly the same than those of atmospheric collector for the environmental sampling. The method uses 3 reference elements (K, Ca and Fe) to establish the primary relationship between salt filters and geostandard filters and consequently for the 7 other elements. Four geostrandards (BEN, DRN and GA of Nancy CRPG and ANRT) were used too to check the validity of the "no matrix effect" hypotheses (grain effect and thin film hypothesis) for this kind of