Evaluation of Standard Measurement Uncertainty From Method Validation Data for the ICP-OES Determination of Nb, Ta, Fe, Mn, Ti, Sn, Zr, and W in Niobite-Tantalite Samples

A procedure is described for the evaluation of standard measurement uncertainty from validation data by the GUM "bottom-up" approach for the determination of Nb, Ta, Fe, Mn, Ti, Sn, Zr, and W in niobite-tantalite (columbite-tantalite) mineral samples by inductively coupled plasma optical emission spectrometry (ICP-OES).Sample preparation was carried out by fusion using a phosphate salt mixture.The method was validated using a single laboratory approach by assessing analytical performance characteristics like specificity, linearity, range, accuracy, and precision.The method showed good specificity and no spectral interferences were observed for all elements determined.Relative standard deviation (RSD) values ranging from 0.9 to 8.3% were obtained for the repeatability studies with values Atomic SpectroscopyVol.