Table 4.
Analysis of proficiency scheme sample for TBT and TPhT.
| Analyte | Certified value (ng L−1) | Acceptance limits (ng L−1) | Measured concentration (ng L−1) (n = 3) |
|---|---|---|---|
| TBT | 43.8 ± 1.5 | 24.1–63.5 | 43.0 ± 0.5 |
| TPhT | 33.0 ± 1.1 | 18.2–47.9 | 31.1 ± 1.0 |
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