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- IODP at MARUM
- Partner to the ECORD Science Operator
- Offshore core curation and measurements
- Initial sampling and analyses
- Interstitial pore waters (IW)
IODP (International Ocean Discovery Program) at MARUM
Interstitial pore waters (IW)
Interstitial pore waters (IW)
In case of soft sediment recovery interstitial waters for geochemical analysis samples are generated from the whole round samples removed from suitable core material on the drillfloor. In less consolidated sediments at the top of a borehole, IW samples are generally 5 cm long (176 cc). The size of the sample may be increased as the sediment becomes more lithified with depth. In addition, pore water acquisition with the new generation of “Rhizon pore water samplers” will be used on MSP expeditions in soft parts of the sedimentary records. The SAC and the geochemists work together to come up with an IW sampling plan that best meets the needs of the shipboard party. The IW sample may be recorded at the core entry computer via Expedition database mDIS.
![IODP ESO lab container IODP ESO lab container](../Binaries/Binary9806/SANY0036-Kopie.400.jpg)
IODP pore water sample splits
Parameter | Sequence | Amount | Unit | Type | take with | take from | Container | Receiver | Prepare | Storage |
CH4, HC | 1 | 3-4 | mL | Sed | cut 5 mL syringe | fresh cut core | 20 mL crimp vial | 5 mL NaOH solution (1 molar) | receiver pipette, 20 mm crimper, caps vials rack | shake and store +4°C upside down |
IW via rhizon | 2 | a | IWRH | rhizon | Whole core | 10/20 mL syringe | rhizone | cap syringe, store +4°C until splitting | ||
IW via squeezer | 2 | b | IWSQ | squeezer | 5 - 10 cm WCR | 10/20 mL syringe | + syringe filter CA | squeezer | cap syringe, store +4°C until splitting | |
pH, alkalinity | 3 | 0.5 | mL | IW split | pipette | IW sample | 1.5 mL Eppendorf cup | pH / alkalinity | label and store +4°C | |
salinity | 4 | 0.5 | mL | IW split | pipette | IW sample | - | refractometer | consumed | |
NH4 | 5 | 0.5 | mL | IW split | 1 mL syringe | IW sample | 0.1 mL loop | Ammonia detector (teflon tape gas sep.) | consumed | |
Cations | 6 | 2-4 | mL | IW split | pipette | IW sample | Nalgene 4 mL | 20-40 µL s.pure HNO3 65% | vials, rack, nitric acid, pipette | label and store +4°C |
Anions | 7 | 2-4 | mL | IW split | pipette | IW syringe | Nalgene 4 mL | vials, rack | label and store +4°C | |
δ 13C | 8 | 1.8 | mL | IW split | pipette | IW sample | 1.4 mL screw vial glass | 20 µL HgCL2 solution, no headspace! | receiver pipette 13mm crimper, caps vials rack | label and store +4°C |
H2S, 34S |
9 | 1.0 | mL | IW split | pipette | IW sample | 2 mL srew vial glass | 20 µL 50mM Zn-acetate solution | receiver solution, vials, rack | label and store +4°C |
δ 18O | 10 | 1.8 | mL | IW split | pipette | IW sample | 1.8 mL crimp vial | no headspace ! | vials, rack, 13 mm crimper caps | label and store +4°C |
Trace elements | 11 | 1-2 | mL | IW split | pipette | IW sample | Nalgene 4 mL | 10-20 µL s.pure HNO3 65% | vials, rack, nitric acid pipette | label and store +4°C |
DOC, PO4 | 12 | 1-2 | mL | IW split | pipette | IW sample | pony vial | vials, rack | label and store +4°C | |
Residual | 13 | mL | IW split | pipette | IW sample | Nalgene 8 mL | label and store +4°C |
Pure water
![](../Binaries/Binary9807/pure-water-ELGA-Purelab-Classic.jpg)