Table T5. Level of seawater contamination expected in cores based on the concentration of PFT observed in sediment, Holes 1228A and 1228E.

Table T5. Level of seawater contamination expected in cores based on the concentration of PFT observed in sediment, Holes 1228A and 1228E.


Core, section	Sample details	ng PFT/ g sediment	Potential µL seawater/ g sediment
201-1228A-
2H-2	Center	0.01	0.01
2H-2	Outside	0.56	0.56
5H-5	Center	BD	BD
5H-5	Outside	0.02	0.02
10H-2	Center	BD	BD
10H-2	Outside	0.22	0.22
14H-3	Center	0.01	0.01
14H-3	Outside	0.02	0.02
15H-1	Center	0.02	0.02
15H-1	Outside	0.07	0.07
15H-1	Wet subcore	0.06	0.06
22H-2	Wet subcore	0.08	0.08
22H-2	Dry subcore	0.11	0.11
201-1228E-
1H-3	Center	0.01	0.01
1H-3	Outside	0.09	0.09

Notes: Detection limit = 0.01 µL seawater/g sediment, BD = below detection. The potential for prokaryotic cell contamination is based on 5 x 10⁸ cells/L surface seawater. This may be viewed as an upper limit for prokaryotic cell contamination because it requires the sediment be porous enough to allow all of the contaminating cells to travel with the PFT.