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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 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 “Rhizone 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 ExpeditionDIS.

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	5	mL	sed	cut 5 mL syringe	cut face	20 mL crimp seal	10 mL saturated NaCl solution with sodium azide	receiver pipette 20 mm crimper caps vials rack	shake and freeze -20°C upside down
	2	a		IW	rhizon	Whole core	20/50 mL syringe		rhizons	cap syringe, keep cool until spliting
	2	b		IW	squeezer	5 - 10 cm WCR	20/50 mL syringe		squeezer	cap syringe, keep cool until splitting
pH, alkalinity	3			IW		2 mL cup	1.5 mL Eppendorf cup			label and keep cool at 4°C
salinity	4			IW		2 mL cup	-		refractometer
NH₄	5	0.5	mL	IW	1 mL syringe	2 mL cup	loop		Ammonia detector (teflon tape gas sep.)	discard
Cations	6	4	mL	IW		IW syringe	ampoule / Nalgene 4 mL	40 µL s.pure HNO₃ 65%	vials rack nitric acid pipette	label and keep cool at 4°C
Anions	7	4	mL	IW		IW syringe	ampoule / Nalgene 4 mL		vials rack	label and keep cool at 4°C
δ ¹³C	8	1.8	mL	IW		IW syringe	1.8 mL crimp cap	20 µL HgCL₂ solution, no headspace !	receiver pipette 13mm crimper caps vials rack	label and keep cool at 4°C
H₂S, ³⁴S	9		mL	IW	hand pipette	2 mL cup	2 mL srew cap wheaton	20 µL 50mM Zn-acetate solution	receiver solution, vials, rack	label and keep cool at 4°C
δ ¹⁸O	10		mL	IW		IW syringe	1.8 mL crimp cap	no headspace !	vials rack, 13 mm crimper caps	label and keep cool at 4°C
Trace elements	11		mL	IW		IW syringe	Nalgene 4 mL	40 µL s.pure HNO₃ 65%	vials rack nitric acid pipette	label and keep cool at 4°C
DOC, PO₄	12		mL	IW		IW syringe	ampoule		vials rack	label and keep cool at 4°C
Residual	13		mL	IW		IW syringe	20 mL Greiner / 15 mL Nalgene			label and keep cool at 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).