Table T9. Water analyses and corresponding reproducibility.
| Parameter (unit) |
Method | IAPSO value | Analytical uncertainty | ||
|---|---|---|---|---|---|
| Accepted | Measured | 1 σ (%) | N | ||
| Alkalinity | Gran titration | 2.33 | 2.34 | 2.2 | 10 |
| Cl (mM) | Titration with AgCl | 559.55 | 544 | 0.7 | 12 |
| H4SiO4 (µM) | Spectrophotometry | BDL | |||
| NH4 (µM) | Spectrophotometry | ||||
| PO4 (µM) | Spectrophotometry | BDL | |||
| SO4 (mM) | Ion chromatography | 28.90 | 28.9 | 0.3 | 6 |
| Mg (mM) | ICP-AES | 54.40 | 10.63 | 2.1 | 6 |
| Ca (mM) | ICP-AES | 10.54 | 51.64 | 2.2 | 6 |
| K (mM) | ICP-AES | 10.46 | 10.26 | 4.6 | 6 |
| Na (mM) | ICP-AES | 480.18 | 465 | 0.4 | 6 |
| Sr (µM) | ICP-AES | 87.00 | 90 | 5.8 | 6 |
| Ba (µM) | ICP-AES | 0.10 | 70 | 0.6 | 6 |
| B (µM) | ICP-AES | 426.65 | 546 | 2.9 | 6 |
| Li (µM) | ICP-AES | 25.70 | 21 | 5.4 | 6 |
| Mn (µM) | ICP-AES | 0.00 | 0.6 | 2.6 | 6 |
| Fe (µM) | ICP-AES | 0.00 | BDL | BDL | |
| DOC (mM) | Gas chromatography | 9.6 | 3 | ||
Notes: IAPSO = International Association for the Physical Sciences of the Ocean, standard seawater. BDL = below detection limit. DOC = dissolved organic carbon. ICP-AES = inductively coupled plasma–atomic emission spectroscopy. N = number of replicate analyses.
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