Table 8.
Procedural blanks, limits of detection (LOD) and the results for REEs measured in CASS-4 and SLEW-3 with optimized Mg(OH)2 coprecipitation procedure. Values are for mean ± standard deviation of five replicate (n=5) measurements
| Element/ Isotope |
Blank (ng L−1) |
LOD (ng L−1) |
CASS-4 (ng L−1) | SLEW-3 (ng L−1) | ||||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| Measured | Reported | %RSD | Measured | Reported | %RSD | |||
|
|
||||||||
| 45Sc | 4.8 | 2.5 | 7.2 ± 0.9 | 0.08 + 0.06a | 13 | 9.0 ± 1.2 | 0.55 + 0.09a | 13 |
| 45Sc | 2.7 ± 0.3d | 0.08 + 0.06a | 11 | 2.8 ± 0.2d | 0.55 + 0.09a | 7.1 | ||
| 89Y | 4.2 | 3.0 | 23 ± 2 | 21± 0a | 8.7 | 48 ± 6 | 42 ± 3a | 12 |
| 139La | 3.2 | 1.3 | 13 ± 2 | 9.3 ± 0.2a | 15 | 7.6 ± 0.8 | 7.7 ± 0.4c | 10 |
| 140Ce | 0.8 | 0.09 | 6.5 ± 0.2 | 5.47 ± 0.16b | 3.1 | 8.2 ± 1.0 | 6.6 + 0.3c | 12 |
| 141Pr | 0.8 | 0.09 | 1.3 ± 0.1 | 1.28 ± 0.07b | 7.7 | 1.7 ± 0.02 | 1.64 ± 0.08c | 1.2 |
| 146Nd | 1.2 | 0.32 | 4.7 ± 0.5 | 4.93 ± 0.62b | 11 | 8.4 ± 0.5 | 7.93 ± 0.13c | 6.0 |
| 149Sm | 1.8 | 0.15 | 6.3 ± 0.8 | 5.46 ± 0.22b | 13 | 6.5 ± 0.5 | 7.2 ± 0.3c | 8.5 |
| 153Eu | 0.7 | 0.07 | 0.31 ± 0.04 | 0.28 ± 0.04b | 13 | 0.61 ± 0.04 | 0.48 ± 0.012c | 6.7 |
| 157Gd | 1.2 | 0.07 | 1.3 ± 0.2 | 1.21 ± 0.03b | 15 | 2.6 ± 0.3 | 3.1 ± 0.2c | 11 |
| 159Tb | 0.3 | 0.04 | 0.32 ± 0.02 | 0.26 ± 0.02b | 6.3 | 0.43 ± 0.02 | 0.45 ± 0.013c | 5.0 |
| 163Dy | 0.6 | 0.05 | 1.2 ± 0.10 | 1.41 ± 0.08b | 8.3 | 3.0 ± 0.2 | 3.38 ± 0.09c | 6.7 |
| 165Ho | 0.4 | 0.01 | 0.42 ± 0.02 | 0.46 ± 0.05b | 5.0 | 0.65 ± 0.1 | 0.91 ± 0.02c | 15 |
| 167Er | 0.4 | 0.05 | 1.30 ± 0.15 | 1.22 ± 0.11b | 11 | 2.2 ± 0.2 | 2.70 ± 0.02c | 9.1 |
| 169Tm | 0.4 | 0.04 | 0.45 ± 0.05 | 0.32 ± 0.04b | 11 | 0.65 ± 0.04 | 0.37 ± 0.07c | 6.1 |
| 172Yb | 1.2 | 0.03 | 0.86 ± 0.10 | 1.32 ± 0.11b | 12 | 0.92 ± 0.07 | 1.85 ± 0.002c | 7.6 |
| 175Lu | 1.4 | 0.07 | 0.22 ± 0.04 | 0.21 ± 0.048b | 18 | 0.32 ± 0.05 | 0.291 ± 0.009c | 15 |
| 232Th | 11 | 0.22 | 2.1 ± 0.3 | 0.51 ± 0.02a | 14 | 0.90 ± 0.2 | 0.22 ± 0.01a | 22 |
| 232Th | 1.2 ± 0.09d | 7.5 | 0.65 ± 0.06d | 9.2 | ||||
| 238U | 2.1 | 0.05 | 2.76 ± 0.16e | (3.0) e | 5.8 | 1.62 ± 0.061e | (1.8) e | 3.8 |
a
Reference values are from Ref.# 46 (Bayon et al., 2011).
b
Reference values are from Ref. # 33 (Zereen et al., 2013).
c
Reference values are from Ref.# 54 (Lawrence and Kamber, 2007).
d
Results obtained for CASS-4 and SLEW-3 spiked with 10 ng L−1 Sc and Th.
e
Measured and reported values for CASS-4 and SLEW-3 are µg L−1. Values in parentheses are information only.