Table 3.
Analysis of standard reference material by two-way ID ICP-MS.
| Mg (mg·kg−1) | Zn (mg·kg−1) | Cu (mg·kg−1) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| NIST956d | GBW | ERM | GBW | ERM | GBW | ||||
| Level 1 | Level 2 | Level 3 | 09152 | -DA120a | 09152 | -DA120a | 09152 | ||
| Day 1 | Test 1 | 34.98 | 22.91 | 10.49 | 20.59 | 0.649 | 1.156 | 1.126 | 1.064 |
| Test 2 | 34.84 | 22.70 | 10.38 | 20.54 | 0.664 | 1.148 | 1.131 | 1.069 | |
| Test 3 | 34.60 | 22.72 | 10.41 | 20.61 | 0.660 | 1.140 | 1.126 | 1.073 | |
|
| |||||||||
| Day 2 | Test 1 | 35.08 | 22.51 | 10.37 | 20.56 | 0.653 | 1.140 | 1.145 | 1.082 |
| Test 2 | 34.60 | 22.95 | 10.43 | 20.63 | 0.652 | 1.156 | 1.140 | 1.077 | |
| Test 3 | 34.66 | 22.83 | 10.51 | 20.52 | 0.650 | 1.144 | 1.143 | 1.080 | |
|
| |||||||||
| Day 3 | Test 1 | 34.74 | 22.59 | 10.36 | 20.50 | 0.665 | 1.147 | 1.131 | 1.069 |
| Test 2 | 34.67 | 22.66 | 10.25 | 20.60 | 0.658 | 1.137 | 1.130 | 1.067 | |
| Test 3 | 35.04 | 22.73 | 10.28 | 20.56 | 0.651 | 1.156 | 1.135 | 1.072 | |
|
| |||||||||
| Avg | 34.80 | 22.73 | 10.39 | 20.57 | 0.656 | 1.147 | 1.13 | 1.072 | |
|
| |||||||||
| cv | 0.5% | 0.6% | 0.8% | 0.2% | 0.9% | 0.7% | 0.6% | 0.6% | |
|
| |||||||||
| Certified values | 34.96 ± 0.24 | 22.83 ± 0.16 | 10.30 ± 0.08 | 20.75 ± 0.44 | 0.658 ± 0.033 | 1.132 ± 0.056 | 1.130 ± 0.033 | 1.085 ± 0.044 | |
|
| |||||||||
| Bias (%) | 0.46% | 0.42% | −0.84% | 0.88% | 0.33% | −1.35% | −0.37% | 1.15% | |