Pengaruh Standar Lantanum Terhadap Validasi Metode Pengukuran Neodimium dan Serium Menggunakan X-Ray Fluorescence (XRF)

Neodymium (Nd) and Cerium (Ce) elemental analysis has been carried out in solution sample using XRF which was generally used for the analysis of solid samples. Special preparation was needed for sample solution so that the analysis results met the testing requirements and safety criteria. The Nd and Ce solution as much as 50uL was dropped on 24mm diameter of filter paper with various concentrations of 200, 400, 600, 800 and 1000ppm without La and with La standard. Next, the sample was analyzed using XRF. The calibration curve from the measurement results showed correlation between concentration and intensity. Based on the two kinds of calibration curves, a linearity curve was obtained with the correlation coefficient (r) Nd of 0.9738 without La, and 0.9990 using La, while the r of Ce was 0.9772 without La, and 0.9992 using La. The detection limit (LoD) and quantification limit (LoQ) was calculated by measuring the intensity of each element in a blank solution, while the precision and accuracy of the measurements was in the concentration range between 0 and 1000 ppm. The analysis using the La met the acceptance criteria, which was more than 95%. It could be stated that the Nd and Ce elemental analysis in solutions using the drop technique using La was more accurate than without La. The drop method for measurement of Nd and Ce using La was valid.with LoD, LoQ, precision and accuracy -8.94 ppm, 0.76 ppm, 1.06%, and 95.43% respectively for Nd elements. Whereas for the Ce element the values are 31.69 ppm, 108.78 ppm, 1.43% and 95.77%,