Research Article
High-Accuracy Determination of Potassium and Selenium in Human Serum by Two-Step Isotope Dilution ICPMS
Table 3
Analysis of standard reference material by two-way ID-ICPMS.
| | K (mg kg−1) | Se (μg kg−1) | NIST956D | GBW09152 | NIST909C | GBW09152 | Level 1 | Level 2 | Level 3 |
| Test 1 | 218.43 | 140.78 | 62.52 | 166.7 | 116.3 | 76.3 | Test 2 | 219.66 | 141.21 | 62.39 | 168.0 | 115.9 | 76.5 | Test 3 | 219.74 | 141.69 | 61.04 | 167.6 | 115.8 | 75.2 | Avg | 219.28 | 141.23 | 61.98 | 167.43 | 116.00 | 76.00 | Certified values | 219.87 ± 1.86 | 142.47 ± 1.37 | 61.50 ± 0.53 | 168.3 ± 3.4 | 115.9 ± 3.2 | 75.7 ± 1.6 | Bias (%) | 0.3% | 0.9% | −0.8% | 0.5% | −0.1% | −0.4% |
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