Composition and reactivity of some river sediments from the Mackenzie Valley,N.W.T., Canada |
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| Authors: | R Wagemann G J Brunskill B W Graham |
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| Institution: | (1) Environment Canada, Freshwater Institute 501 University Crescent Winnipeg, R3T 2N6 Manitoba, Canada |
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| Abstract: | Sediments from the Mackenzie Valley — two suspended and one river bottom — were analyzed for major and minor elements, mineralogy,
particle size, and ability to release trace metals when subjected to mild leaching.
Copper and zinc in suspended sediments and cadmium in bottom sediment occurred largely (70 to 84 percent for Cu, 72 to 98
percent for Zn, 75 to 81 percent for Cd) in a form that could not easily be separated from the sediments by 0.1M HC1 and EDTA
solutions. Cadmium was present in suspended sediments in low concentrations, and was present totally in sorbed leachable form.
Iron, manganese, cobalt and chromium were separable from the particulate phase by mild leaching. It was found that approximately
70 hours were required for an apparent steady state concentration to be attained in such leachings.
Reaction of these sediments with Beaufort Sea water (salinity 22.3 parts per thousand) indicated that both iron and manganese
were released from sediments to sea water to a very small degree. Copper, lead, and zinc, however, were absorbed by sediments
from sea water. |
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