Abstract
Sediment and interstitial water from four cores in Saanich Inlet were analyzed for total iron, manganese, nickel, cobalt, copper, molybdenum, zinc, lithium and strontium. In addition, three separate sediment fractions were analyzed: 1. (i) dilute acid soluble 2. (ii) hydrogen peroxide soluble and 3. (iii) non-extractable residue. In the interstitial waters, Fe, Mn and occasionally Zn showed enrichment varying from one to several orders of magnitude greater than the overlying sea water, the highest concentration was attained by Mn (3.3 ppm). Other elements were enriched only by a factor of 2 to 5 above sea water concentration. Enrichments are probably due to: 1. (1) organic complexing of the metals 2. (2) equilibration with mineral phases which could generally not be identified in the solid. Concentration of transition and base metals in the sediment is dependent on the source (provenance) of the detrital minerals and biogenic components (either skeletal tests or organic compounds). Little evidence was found for removal of these elements from the water column at the water-sediment interface. Diagenesis within the sediment column appears to be time-dependent. Mobilization of elements, particularly Cu, Fe, Ni and Zn, takes place away from the insoluble silicate phase into the H 2O 2 soluble phase, which suggests organic complexing.
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