Table T2. Analytical methods and precisions for interstitial water geochemistry measurements, Expedition 303.
| Parameter | Method | Precision (%) |
|---|---|---|
| Alkalinity | Gran titration | 1.5 |
| pH | Gran titration | 3.1 |
| Cl– | Titration with AgNO3 | 0.2 |
| SO42– | Ion chromatography | 2.0 |
| Li+ | ICP-AES | 2.2 |
| K+ | Ion chromatography | 1.6 |
| NH4+ | Spectrophotometer | 2.5 |
| Mg2+ | Ion chromatography | 2.7 |
| Ca2+ | Ion chromatography | 5.2 |
| Sr2+ | ICP-AES | 1.3 |
| Ba2+ | ICP-AES | 27.1 |
| Mn2+ | ICP-AES | 27.0 |
| Fe2+ | ICP-AES | 62.1 |
| H3BO3 | ICP-AES | 2.1 |
| H4SiO4 | ICP-AES | 3.9 |
Note: The reproducibility of analytical techniques is expressed as 1σ standard deviation of the mean of multiple determinations of a standard. The standard data used to calculate analytical precision in this table were generated during the period of analyses for the samples from Sites U1302–U1307. ICP-AES = inductively coupled plasma–atomic emission spectroscopy.
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