Skip to main content
Skip to main content

Sample Weight: 2.00 g


Rare earth elements are determined in rocks by Wavelength Dispersive X-Ray Fluorescence spectrometry (WDXRF). Samples are fused with lithium borate and fused into a glass disk. The disk is then analyzed by WDXRF.

Method 27 Elements and Reporting Limits
Element Concentration (low) Concentration (high)
Ce, Cerium 0.02% 20%
Dy, Dysprosium 0.02% 20%
Er, Erbium 0.02% 20%
Eu, Europium 0.02% 20%
Gd, Gadolinium 0.02% 20%
Ho, Holmium 0.02% 20%
La, Lanthanum 0.02% 20%
Lu, Lutetium 0.02% 20%
Nd, Neodymium 0.02% 20%
Pr, Praseodymium 0.02% 20%
Sm, Samarium 0.02% 20%
Tb, Terbium 0.02% 20%
Th, Thorium 0.02% 20%
Tm, Thulium 0.02% 20%
U, Uranium 0.02% 20%
Y, Yttrium 0.02% 20%
Yb, Ytterbium 0.02% 20%

Analytical Performance

Data will be deemed acceptable if recovery of each element is ±5% at five times the Lower Limit of Determination (LOD) and the calculated percent Relative Standard Deviation (RSD) of duplicate samples is no greater than 5%.

Project Contact

Jaime Azain
Phone: 303-236-9376
Central Mineral and Environmental Resources Science Center

Mineral Resources Program Science Priority

The use of firm, trade, and brand names is for identification purposes only and does not constitute endorsement by the U.S. government.

Download if needed: Excel Viewer | PDF Reader | Powerpoint Viewer | Word Viewer