| Popis: |
Possible matrix effects in the direct x-ray fluorescence determination of Na, Mg, Al, Si, P, K, Ca, Mn, Fe, S, Sr, and Cl in powdered plant materials were considered; their contributions were evaluated, and dominant effects were estimated that should be taken into account to ensure the required accuracy of the analytical results. It was shown that the main matrix effects are the absorption and scattering of the incident and fluorescence x-rays by the sample as well as the additional excitation of the analyte fluorescence by the fluorescence of heavier elements. The efficiency of α correction with theoretical coefficients for their account was shown. |
