Calibration certificate for the TNb reference standard set (1 / 5 / 10 / 20 mg/L N).
This certificate documents the gravimetric preparation and certified concentration values of the TNb standard set used for routine calibration of multi N/C analyzers.
| Solution | Nominal | Certified | U (k=2) |
|---|---|---|---|
| Std-1 | 1.00 | 1.003 | 0.012 |
| Std-2 | 5.00 | 5.014 | 0.043 |
| Std-3 | 10.00 | 10.022 | 0.082 |
| Std-4 | 20.00 | 19.984 | 0.157 |
Traceable to NIST SRM 3140 via secondary in-house standard. Gravimetric preparation on Sartorius Cubis II MSA225P (calibrated 2026-01-08).