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| Sample | Total runs | Mean concentration, measured (PPM) | Standard deviation (PPM) | Coefficient of variation (%) |
|---|---|---|---|---|
| High concentration (~25,000 PPM) | 24 | 25,017 | 1,038.2 | 4.15% |
| Medium concentration (~1,000 PPM) | 24 | 991.0 | 35.18 | 3.55% |
| Low concentration (~25 PPM) | 24 | 26.02 | 3.323 | 12.77% |
