Proceedings - Teaching and Learning Centre - Simon Fraser ...

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Fraser River Action Plan 3rd Research Workshop 1. To contrast the geochemistry of trace metals Cd, Pb, Hg and Zn at three sites along the mudflats of the Fraser River estuary; and, 2. Relate these differences in trace metal geochemistry to metal availability in Macoma balthica. 1. Sediment Geochemistry • sediment matrix plays an important role in the bioavailability of metals; • the key geochemical components in terms of metal binding are organic matter and oxides of Fe and Mn; and, • it is the sediment matrix, as well as the partitioning of a metal among these geochemical components, that will influence metal availability. 2. Porewater • used to obtain profiles of total dissolved Fe and Mn in the interstitial water at different depths; and, • profiles reveal contribution of diagenesis to concentrations of particulate Mn and Fe at the sediment water interface (i.e., whether the sediments are a sink or source of these elements). 3. Tissue Chemistry Why use Macoma balthica? • it lives and feeds in the upper portion of the deposit sediments; • tissue levels tend to reflect levels of metals in the sediment; and, • it forms an important link in the estuarine food web and ingestion by higher trophic levels could lead to transfer of metals to higher trophic levels. Methods • levels of metals in Macoma balthica were measured in the tissue and shell; and, • by correlating tissue levels with sediment levels, it will give us indication of the source of the bioavailable fraction of metals, as well as which sites pose a greater risk of metal bioaccumulation. Objective One To contrast the geochemistry of trace metals Cd, Pb, Hg and Zn at three sites along the mudflats of the Fraser River estuary. Will be addressed by: Sediment geochemistry • grain size, % LOI, concentrations of Fe and Mn oxides and concentrations of the above mentioned metals in the different sediment fraction. Porewater • will reveal profiles of dissolved Fe and Mn at depth in the sediment; and, • help determine whether the sediments are a source or a sink of Mn and Fe oxides. Objective Two Relate these differences in trace metal geochemistry to metal availability in Macoma balthica and, potentially, other benthic dwelling organisms. Will be addressed by: Field Component • benthic samples have been collected from each site; • Macoma balthica only found at Sturgeon Bank and part of Roberts Bank; Page 266
Fraser River Action Plan 3rd Research Workshop • tissues and shells will be digested separately and analyzed for these metals; and, • will try to correlate levels of metals in tissues to levels in certain sediment fractions (organic and Fe and Mn oxides). Lab Component • radioisotope experiment; and, • will spike natural sediment collected from two sites that show variation in sediment geochemistry. Page 267
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PROCEEDINGS 3rd RESEARCH WORKSHOP F
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TABLE OF CONTENTS Participants ....
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Development of a Citizen’s Monito
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Fraser River Action Plan 3rd Resear
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SESSION 1 PULP MILL EFFLUENT ISSUES
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SESSION 4 AGRICULTURAL ISSUES
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Proceedings - Teaching and Learning Centre - Simon Fraser ...

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