Highways Agency Report

             Shelfmark: HA Room 114-17, Heron House, Bedford.  Runoff A24
       Personal author: Jones B
                 Title: Distribution and speciation of heavy metals in
                        surficial sediments from the Tees Estuary, North-east
                        England
             Publisher: Elsevier Science Ltd 1997
  Physical description: 12 leaves, charts, maps
                 Price: Unpriced
                Series: SSR Water Library Runoff A24
       Notes - general: Abstract: Surface sediments from the Tees Estuary were
                        analysed for grain size, organic carbon content and
                        metal concentrations.  Metal speciation was determined
                        by aequential abstraction.  The sediments are largely
                        organic-rich clayey-silts in which metal
                        concentrations exceed background levels, and which
                        attain peak values in the upper and middle reaches of
                        the estuary.  Cu, Pb and Zn concentrations appear to
                        have declined since the 1970s.  CR, Pb and Zu are
                        associated with the reducible, residual, and
                        oxidizaable fractions.  Cd is similar, with the
                        exchangeable fraction also significant.  Cu is
                        associated with the oxidizable and residual fractions,
                        and Co and Ni, which are not highly enriched, are
                        hosted mainly by the residual phase.  Potential exists
                        for the mobilization of Cr, Pb and Zn during
                        diagenesis, as iron and maganese oxides are reduced,
                        and for Cu, Cr and Zn mobilization as organic matter
                        is mineralized within the sediment.
               Keyword: Road Runoff
 SSR WATER LIBRARY MATERIAL
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