Table 1
General information on the sampling station
| Station ID | EXP–1 |
|---|---|
| Location | 54°37'N;18°59'E |
| Water depth | 85 m |
| Bottom water salinity | 10.4 PSU |
| Bottom water temperature | 5.9°C |
| Type of sediment | silt |
| Corg content in layer 0–1 cm | 7–8 % wt. * |
[i] *– based on Szczepańska & Uścinowicz (1994)
Table 2
Summary of factors associated with the applied pore water extraction methods
| Factor | Method I (rhizon samplers) | Method II (centrifugation of sediment subsamples collected using syringes) | Method III (centrifugation of sediment sections pushed out of a core liner) |
|---|---|---|---|
| centrifugation | – | + | + |
| contact with atmospheric air | – | +/– | + |
| core disturbance | – | – | + |
| filtration | + | – | – |
Figure 1
Profiles of ammonia concentration obtained for three methods of pore water sampling (a – rhizon samplers; b– centrifugation of sediment subsamples collected using syringes; c– centrifugation of sediment sections pushed out of core liners). In the case of Method II, concentration values for cores 5 and 6 were interpolated, and in the case of Method III, concentrations for each sediment layer are given for a sediment depth from the middle of a layer.
Figure 2
Profiles of sulfide concentration obtained by three methods of pore water sampling (a – rhizon samplers; b – centrifugation of sediment subsamples collected using syringes; c – centrifugation of sediment sections pushed out of core liners). In the case of Method II, concentration values for cores 5 and 6 were interpolated, and in the case of Method III, concentrations for each sediment layer are given for a sediment depth from the middle of a layer.
Figure 3
Profiles of the average ammonium concentration for three methods of pore water sampling (Method I – rhizon samplers, Method II – centrifugation of sediment subsamples, Method III – centrifugation of sediment sections). In the case of Method III, concentrations were averaged to obtain values for depths of 5, 10, 15 cm etc.
Figure 4
Profiles of average sulfide concentration for three methods of pore water sampling (Method I – rhizon samplers, Method II – centrifugation of sediment subsamples, Method III – centrifugation of sediment sections). In the case of Method III, concentrations were averaged to obtain values for depths of 5, 10, 15 cm etc.