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

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

–

–