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Abstract

The post-glacial sediments of Loch Lomond contain a well-defined band of marine-deposited material which is overlain and underlain by freshwater-deposited sediment. Previous work has established that the marine-deposited sediment contains enhanced concentrations of iodine and bromine relative to the contiguous freshwater sediments and that dissolution of halogen elements from the marine sediments generates a concentration gradient, with consequent diffusive transport, of these elements in the sediment interstitial water. The objective of the work described was to collect a new core of Loch Lomond sediment in order to carry out various analyses. Chlorine, bromine and iodine concentration-depth measurements in interstitial waters of selected cores of Loch Lomond sediments are presented. The Cl(-) and I(-) concentration profiles in the sediment interstitial water are consistent with a diffusion dominated transport of these ions through the sediment column, with a similar rate of movement and no relative removal of these species during transport. The bromide ion distribution provides a less convincing argument for diffusive transport for this core than for the previous core studied from this location.

Additional information

Authors: MACKENZIE A B, Scottish Universities Research and Reactor Centre, Glasgow (GB);SHIMMIELD T M, Scottish Universities Research and Reactor Centre, Glasgow (GB);SCOTT R D, Scottish Universities Research and Reactor Centre, Glasgow (GB);DAVIDSON C M, Scottish Universities Research and Reactor Centre, Glasgow (GB);HOOKER P J, British Geological Survey, Keyworth, Nottingham (GB)
Bibliographic Reference: EUR 13128 EN (1991) 24 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-2338-6
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