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Sedimentary Iron as a buffer

Summary:
We have found that high iron availability in the sediment, i.e. 50 - 100 µmol.cm-3 (see also Giordani et al., 1996, Stal et al., 1996 in Hydrobiologia 329, final report of the EU project CLEAN, EV5V-CT92-80), buffers efficiently against increased biogenic sulphide production related to increased eutrophication. A novel system, the biological oxygen and sulphide monitor (BOSM) has been developed for monitoring the fate of sulphide amended to sediment slurries and for measuring the reoxidation of sulphide by abiotic processes and chemotrophic bacteria in sediment slurries under both aerobic and anaerobic conditions (Heijs et al., 1999, reproduced in Extended Report, Vol. I, p. 115-). A first approximation of the sedimentary buffering capacity to sulphide is given by the maximum amount of sulphide added before free sulphide is detected in the sediment slurry medium. The initial products of added sulphide comprise mainly iron sulphide (FeS), which was the only product at station A (outer marine influenced station), while at station B (inner station) sulphur and pyrite were additional products in the surficial and deeper layers, respectively (Heijs et al., 1999).

Reported by

Université Bordeaux 1
CNRS-UMR 5805
BORDEAUX
France
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