The behaviour of iodine and bromine in estuarine surface sediments |
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| Authors: | SJ Malcolm NB Price |
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| Institution: | 1. Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW Gt. Britain;2. Scottish Marine Biological Association, Dunstaffnage Marine Research Laboratory, P.O. Box 3, Oban, Argyll PA34 4AD Gt. Britain |
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| Abstract: | The distribution of iodine and bromine was examined in sediments which receive inputs of marine and terrigenous organic matter. The I and Br concentrations are directly related to the content of ‘marine’ organic matter defined using carbon/nitrogen ratios. In the Etive sediments both Br and I may be used as an indicator of ‘marine’ organic matter; Br is of general application as the ratio (180 × 10?4) is similar to ratios in other sedimentary environments but the use of I is restricted as the ratio is unlike those in other sediments. Experimental study of iodine sorption clearly shows the importance of decaying marine organic matter and oxygenated conditions in the incorporation of iodine by sediments. This suggests that the mechanism of incorporation of iodine by seston previously proposed is probably an important pathway to sediments. The similarity of Br association with marine organic matter suggests that Br sorption as opposed to residual enrichment may be important for sediment Br accumulation. |
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