|
Parameter
|
Method
|
Reproducibility
|
|---|---|---|
| Interstitial water: |
|
|
| Alkalinity | Gran titration | ±1.5% |
| Cl- | Titration with AgCl | ±0.1% |
| K+ | Ion chromatography | ±0.02% |
| Mg2+ | Ion chromatography | ±0.1% |
| Ca2+ | Ion chromatography | ±0.2% |
| SO42- | Ion chromatography | ±0.1% |
| Si(OH)4 | Spectrophotometry | ±0.9% |
| NH4+ | Spectrophotometry | ±4 µM |
| Mn2+ | ICP-AES | ±3.9% |
| Li+ | ICP-AES | ±3.0% |
| Sr2+ | ICP-AES | ±4.8% |
| Ba2+ | ICP-AES | ±4.0% |
| B | ICP-AES | ±1.49% |
| Bulk sediments: |
|
|
| Ba | ICP-AES | ±21.3% |
| Ca | ICP-AES | ±11.5% |
| Fe | ICP-AES | ±9.2% |
| Mn | ICP-AES | ±8.1% |
| Si | ICP-AES | ±3.3% |
| Ti | ICP-AES | ±21.7% |
| Al | ICP-AES | ±5.1% |
| Mg | ICP-AES | ±12.7% |
| P | ICP-AES | ±32.9% |
| Sr | ICP-AES | ±14.7% |
Notes: ICP-AES = inductively coupled plasma-atomic emission spectroscopy. Because absolute concentrations of NH4+ measured during Leg 199 were so small, relative to typical NH4+ concentrations, reporting reproducibility relative to these low, measured concentrations would be exaggerated. Therefore, we report reproducibility in absolute concentration units.