Metal Context of Ocean Sediment in Support of UXO Clearance – HMS Raleigh: Third Round

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Authors
  1. Fisher, G.
  2. Nault, P.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
This report details the results of a third round of unexploded ordnance (UXO) clearance, completed in June 2005, from the wreck site of the British munitions ship, HMS RALEIGH, which was scuttled in Forteau Bay, NL in 1922. The operation included onsite detonation of UXO. Ocean sediment samples were collected from the site before and after detonation and analyzed for elemental content by inductively coupled plasma – mass spectroscopy (ICP-MS). As in previous rounds, the elemental composition of ocean sediments at the wreck site was found to be altered by the UXO detonation. Specifically, in this round, the concentration of elements found in common industrial materials (Fe, Ni, Mn, for example) were reduced in wreck site sediments. The concentration of some elements was found to increase in wreck site sediments. These included Cs, Li, Sr and Ti. It was concluded that the cause of this increase was disturbance to geological features by the detonation. This round of testing included pre- and post-detonation sampling of sediments removed from areas away from the wreck site. The elemental composition of these sediments enabled assessment of the impact of the wreck itself on sediment composition. It was observed that sediments from the wreck site were higher in content of some elements than sediments from other locations. The affected elements included many, such as Al, Co, Mn, Ni and Zn, that are used in common naval materials. Evaluation of sediments from outside the wreck also

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Report Number
DRDC-ATLANTIC-TM-2005-230 — Technical Memorandum
Date of publication
01 Nov 2005
Number of Pages
32
DSTKIM No
CA027849
CANDIS No
525714
Format(s):
CD ROM

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