National Taiwan University Dept Chem EngnKuo, T.J.T.J.KuoLiang, S.W.S.W.LiangPeter H. Santschi2006-11-142018-06-282006-11-142018-06-282006http://ntur.lib.ntu.edu.tw//handle/246246/2006111501254709Using physical (0.1 & 0.45 Am cut-off filters) & ion exchange (Chelex-100 & AG MP1 resins) separation techniques, detailed distribution patterns & chemical affinities of selected trace metals (Cd, Cu, Ni, Pb) were investigated under different redox conditions in the Danshuei River estuary, a macro-tidal, temporally anoxic estuary, passing though the metropolitan area of Taipei in Northern Taiwan. A distinct partitioning & removal behavior of the different trace metals was revealed, in that under high river flow & oxic conditions, a large fraction of these trace metals that were passing through a b0.1 Am pore size filter was found to be Chelex-labile, while during the dry season, low river flow & anoxic conditions, elevated fractions of trace metals, especially Cd & Cu, were found to be strongly complexed to inert ligands such as sulfides, with higher percentages present also in the colloidal (0.1–0.45 Am), & particulate (N0.4 Am) size fractions. Large fractions of both particulate & dissolved metals were removed within the estuary, especially during anoxic conditions in the dry season. Anoxic conditions in the upper Danshuei estuary resulted in very high sulfide concentrations that likely were responsible for the high removal of trace metals as metal-sulfides in the water column during that time. The variations in distribution & fractionation patterns of the different metals were reflected by both their affinities to ion exchange resins & their size distributions.application/pdf457449 bytesapplication/pdfzh-TWTrace metalsFractionationEstuaryAnoxicIon exchangeTaiwanjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501254709/1/2734.pdf