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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
ESO clean lab container during Exp. 313 New Jersey Shallow Shelf.
 

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

Ultra pure water (Type I, 18.2 MΩ-cm) suitable for geochemical and microbiological lab purposes is produced from pre-purified water (by an upstream SERADEST ion exchanger cartridge) with a PURELAB Classic device (ELGA).