Contrasting two methods for determining trace metal partitioning in oxidized lake sediments |
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Authors: | Leah Bendel Young Michelle Dutton F R Pick |
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Institution: | (1) Dept. of Biology, University of Ottawa, K1N 6N5 Ottawa, Ontario, Canada;(2) Dept. of Biology, Dalhousie University, Halifax, Nova Scotia, Canada |
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Abstract: | A simultaneous (SIM) sediment extraction procedure for low carbonate sediments, which partitions sediment-bound trace metals
(Fe, Mn, Zn, Cu, and Cd) into easily reducible (associated with Mn oxides), reducible (associated with Fe oxides) and alkaline
extracted (bound to organic) metal is presented. The SIM method was compared to the sequential (SEQ) extraction procedure
of Tessier et al. (1979). Both methods showed good agreement for the partitioning of Zn and Cd among the easily reducible,
reducible and organic components of sediment. Both methods also showed the same general distribution of Mn, Fe and Cu among
the three sediment components, however concentrations of metals recovered by the two methods differed; less Mn and Fe and
more Cu was recovered from sediments by the SEQ vs. the SIM procedure. Less recovery of Mn is in part attributed to the loss
of this metal in the `in between' reagent rinses required in the SEQ procedure. Greater recovery of Cu by the SEQ vs. the
SIM method may be due to the pretreatment of sediment with strong reducing agents prior to the step used for liberating organically
bound metals. Advantages of a SIM over the SEQ include rapid sample processing time (i.e. the treatment of 40 samples per
day vs. 40 samples in three days), plus minimal sample manipulation. Hence, for partitioning metals into easily reducible,
reducible and organic sediment components in sediments low in carbonate, we recommend the use of a SIM extraction over that
of a SEQ procedure. |
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Keywords: | simultaneous extraction sediment trace metal partitioning |
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