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Table T5. Subsampling scheme and treatments for KNOX-02RR postcruise interstitial water studies.
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Analysis
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Sample size (mL)
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Treatment
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Cations
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0.75
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Stored at 4°C
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NH4
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4.5
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45 µL Optima HCl
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δ15N of dissolved NO3 and/or NH4
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4.5 (×2)
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Frozen at –10°C
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DOC, DON, carbohydrates, dissolved amino acids, fatty acids, δ13C of DOC
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3.5 (×2)
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Frozen at –10°C
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δ13C of DIC
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3.5
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10 µL HgCl2
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DIC
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2
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10 µL HgCl2, flushed with N2 for 2 min, inverted and frozen at –10°C
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He
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1 (in copper tubing)
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Room temperature
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Dissolved Fe, Mn, and PO4
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4.5
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45 µL Optima HNO3
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Squeezed sediment
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NA
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Frozen at –10°C
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NA = not applicable. DOC = dissolved organic carbon, DON = dissolved organic nitrogen, DIC = dissolved inorganic carbon.
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