Table T5. Potential contamination based on PFT and parallel bead counts, Holes 1227A and 1227D.

Table T5. Potential contamination based on PFT and parallel bead counts, Holes 1227A and 1227D.


Core, section	Sample details	ng PFT/ g sediment	Potential µL seawater/ g sediment	Beads counted	Beads/g
201-1227A-
2H-2	Center	0.02	0.02
2H-2	Outside	1.37	1.37
2H-5	Center	0.02	0.02
2H-5	Outside	0.13	0.13	3 in 50 fields	76
3H-5	Center	0.02	0.02
3H-5	Outside	0.13	0.13
5H-3	Center	BD	BD
5H-3	Outside	1.46	1.46
7H-2	Center	BD	BD	0	0
7H-2	Outside	6.39	6.39	0	0
12H-2	Center	0.05	0.05	1 in 53 fields	(16)
12H-2	Outside	0.86	0.86	8 in 50 fields	533
14H-2	Center	0.05	0.05
14H-2	Center replicate	0.05	0.05
18H-2	HTEW	0.08	0.08
201-1227D-
1H-3	Center	0.02	0.02	0	0
1H-3	Outside	0.55	0.55
4H-6	Center	BD	BD
4H-6	Outside	3.32	3.32
4H-6	Center II	BD	BD

Notes: Detection limit = 0.01 mL seawater/g sediment. PFT = peroflurocarbon tracer. BD = below detection. The potential for microbial contamination is based on 5 x 10⁸ cells/L surface seawater. This may be viewed as an upper limit for microbial contamination because it requires that the sediment be porous enough to allow all of the contaminating cells to travel with the PFT. HTEW = high-temperature enrichment sample. The number in parentheses represents results based on a single, non-reproducible bead observation.