Determinación de cobre y zinc por fluorescencia de rayos-X de dispersión de energías en zeolita natural modificada
Keywords:modified zeolites; procedure validation; X-Ray fluorescence.
A procedure for the determination of Cu and Zn by Energy Dispersive X-Ray Fluorescence in naturals modified zeolites with these elements is presented. Reference samples of these materials were prepared and used for the procedure validation. The validation included the estimation of the following performance characteristics: scope, precision, bias and combined measurement uncertainty. The last tree characteristics were estimated at five levels of concentration defined by the reference samples. The precision was obtained in repeatability conditions and intermediate conditions, different analyst, different time and different time-analyst. The results obtained with the proposed procedure in the reference samples were compared with the results obtained in the same samples with the Flame Atomic Absorption Spectrometry. The comparison was carried out by linear regression using the iterative reweighted least squared method. No statistical significant differences were found between results.
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