Research Article
High-Accuracy Determination of Potassium and Selenium in Human Serum by Two-Step Isotope Dilution ICPMS
Table 2
Precision for potassium and selenium in human serum by two-step ID-ICPMS.
| | | K (mg kg−1) | Se (μg kg−1) | | Level 1 | Level 2 | Level 3 | Level 1 | Level 2 | Level 3 | | Day 1 | Day 2 | Day 1 | Day 2 | Day 1 | Day 2 | Day 1 | Day 2 | Day 1 | Day 2 | Day 1 | Day 2 |
| | 1# | 137.2 | 137.1 | 178.2 | 177.3 | 252.0 | 252.3 | 80.3 | 81.3 | 115.7 | 115.8 | 135.1 | 133.6 | | 2# | 136.6 | 136.9 | 177.7 | 177.6 | 252.7 | 252.0 | 79.6 | 80.8 | 116.6 | 116.1 | 133.2 | 133.9 | | 3# | 136.1 | 136.7 | 178.1 | 178.1 | 253.0 | 252.3 | 80.7 | 80.8 | 115.7 | 116.1 | 134.5 | 133.6 | | 4# | 136.9 | 137.0 | 178.0 | 178.8 | 252.9 | 252.0 | 80.5 | 80.0 | 114.7 | 116.4 | 132.6 | 134.8 | | 5# | 136.4 | 137.0 | 177.9 | 178.0 | 252.0 | 252.0 | 81.2 | 81.1 | 115.1 | 115.9 | 131.8 | 134.1 | | 6# | 136.9 | 136.9 | 177.9 | 178.6 | 252.3 | 252.4 | 80.7 | 80.5 | 116.6 | 116.2 | 133.6 | 134.5 | | Avg | 136.8 | 178.0 | 252.3 | 80.6 | 115.9 | 133.8 | | s | 0.31 | 0.41 | 0.36 | 0.49 | 0.57 | 0.94 | | CV | 0.2% | 0.2% | 0.1% | 0.6% | 0.5% | 0.7% | | U (k = 2) | 0.14 | 0.21 | 0.23 | 1.5 | 2 | 2.6 |
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