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Data of triplicate certified reference materials analysis
| K | Ca | Mg | |
|---|---|---|---|
| Certified reference material LGC-7173 | |||
| Certified, g kg−1 | 7.40 | 14.4 | 1.60 |
| Observed, g kg−1 | 6.96 | 14.3 | 1.68 |
| Recovery rate, % | 94 | 99 | 105 |
| Certified reference material NCS ZC73009 | |||
| Certified, mg kg−1 | 1400 | 340 | 450 |
| Observed, mg kg−1 | 1414 | 309 | 446 |
| Recovery rate, % | 101 | 91 | 99 |
