Other
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1179c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1179-1188
Other
4
Scientific paper
Reduced inorganic sulfur species constitute the major fraction of total sulfur in the recent sediments of eight acid lakes of southwestern Quebec. Nearly all of the anthropogenically derived excess S present in the sediments has accumulated as reduced inorganic forms, showing that organic S formation plays a very minor role in long term anthropogenic S retention in these lakes. These results appear different from most other published studies on S fixation in acid lake sediments. Respectively 74% and 76% of the variance in total S and reduced inorganic S burden in the recent sediments can be explained by their Fe content alone, indicating that the reduced S is associated with iron, and that the capacity of the sediments to retain S may be limited by available Fe supply. When indexes of organic C supply (winter O 2 deficit and sediment C) are included with Fe in a multiple regression analysis, respectively 97% and 98% of the variance in total S and reduced inorganic S accumulation can be explained. The origin of the pronounced subsurface Fe maximum observed in most cores is attributed to the reduction and recent burial, as iron sulfides, of a surficial diagenetic Fe(OH) 3 reserve. In some sediments, this Fe(III) reserve presently appears to be nearly or completely exhausted, and the lakes may have lost their capacity to generate permanent alkalinity via SO 2- 4 reduction. The present rate of alkalinity production due to SO 2- 4 reduction and fixation of reduced S in the sediments of one lake were estimated from several 210 Pb-dated S profiles and averaged to 163 eq · m -2 · d -1 ; this value is comparable to those reported for other acid lakes.
Carignan Richard
Tessier Alexandre
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