4. Results and discussion
4.1. Abundance and d34S of bulk OS
Concentrations of extractable OS polarity fractions and total
residual OS (‘kerogen’ from Werne et al. (2003)) are shown in
Fig. 1. In sediments, extractable OS increases with depth from 17
to 77 nmol S/gOC and represents ca. 0.1‰ of residual OS. The d34S
values of extractable and residual OS are similar, especially below
40 cm, and range from 18.0‰ to 25.9‰. Polar (F3) material represents
92–98% of total extractable OS.