![]() ![]() ![]() Simultaneously, the validation set consists of natural certified reference materials of REE-rich ores and oceanic ferromanganese nodules. A feature of our calibration set is the use of artificial mixtures of REE oxides and Fe 2O 3 + TiO 2 (as a matrix) providing extremely low correlation (<0.03) between the content of different REEs. Its applicability was assessed for univariate and multivariate (PCR, PLS) calibration models to overcome the above issues. For the first time, this is done by employing a specially designed calibration set, based on Latin hypercube sampling. The issues of high pairwise correlation between REE contents in certified reference materials of natural origin, resulting in a poor quality of calibration sample set, and the significant overlapping of REE lines, especially in TXRF spectra, which have low spectral resolution, are addressed in the study. This study concerns the simultaneous detection of five rare-earth elements (REEs) – Ce, La, Nd, Pr, Sm – in ores and nodules using two X-ray fluorescence techniques (XRF): total reflection (TXRF) and wavelength-dispersive (WDXRF). ![]()
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