Analisis Kuantitatif Neodimium, Praseodimium, Cerium, dan Lantanum dalam Monasit dengan KCKT Pertukaran Ion

Abstract

Neodymium, Praseodymium, Cerium, and Lanthanum are rare earth elements with considerably high concentration in monazite and xenotime. Samples used in this research are monazite sands from PT Timah Bangka and obtained from Dowa Mining product. The determination and separation of these rare earth elements carried out with ion exchange HPLC method using ion exchanger column Supelcosil LC-SCX with column length 25 cm, diameter 4.6 mm and particle size 5 mm, and using conductometer detector of Waters 432 type. The optimum condition for these rare earth elements were: using ethylendiamin solution of 1.50 mM, and tatrate acid 2.00 mM as moving phase and complexing agent at pH 4.5 with flow rate 0.8 mL per minute and sample volume 10 mL. Research results showed that ion exchange HPLC method can be used to separate and to determinate the concentration of Neodymium, Praseodymium, Cerium, and Lanthanum. Chromatograms obtained of these four of rare earth elements were well separated. This was showed from their resolutions (R) which range from 2 to 4 at concentration 100 ppm for Neodymium, Praseodymium, Cerium, and Lanthanum with retention time 9.66, 10.87, 13.42, 16.29 minutes respectively. The concentration of Neodymium, praseodymium, cerium, and lanthanum in monazite (w/w) were 4.580±0.003, 7.860±0.002, 4.200±0.003, 4.160±0.005% respectively.