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Table 2 Analytical method quality assurance for USGS reference materials BCR-2 and SGR-1 with ICP-MS following LiBO2 fusion

From: Rare earth element geochemistry of outcrop and core samples from the Marcellus Shale

Analyte (MDL; ppm) BCR-2 (ppm) SGR-1 (ppm)
Measured Certified % Diff. Measured Certified % Diff.
Sc (0.137) 32.6 33 −1.34 5.25 4.6 14.2
Y (0.003) 32.5 37 −12.1 10.3 13 −21.0
La (0.002) 24.5 25 −1.90 18.7 20 −6.4
Ce (0.002) 55.0 53 3.69 35.8 36 −0.4
Pr (0.002) 7.04 6.8 3.59 4.00
Nd (0.004) 29.6 28 5.74 14.6 16 −8.9
Sm (0.008) 6.84 6.7 2.13 2.64 2.7 −2.1
Eu (0.002) 2.04 2 2.19 0.48 0.56 −15.0
Gd (0.003) 6.85 6.8 0.70 2.13 2 6.7
Tb (0.001) 1.07 1.07 0.19 0.32
Dy (0.002) 5.54 1.65 1.9 −13.3
Ho (0.002) 1.34 1.33 0.63 0.39
Er (0.003) 3.69 1.10 1.1 0.2
Tm (0.002) 0.56 0.54 3.37 0.17 0.17 −1.5
Yb (0.002) 3.44 3.5 −1.77 1.07 0.94 13.9
Lu (0.003) 0.52 0.51 2.47 0.15
  1. Method detection limits (MDL) are given in parentheses next to each analyte. Elements without certified values are denoted with a dash (–), as are the corresponding percent differences (% Diff.). For reference, average analytical variability was 3.4% from five sweeps during analysis.