Copper dissociation from estuarine humic materials |
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| Authors: | Dean L Olson Mark S Shuman |
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| Institution: | Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27514 USA |
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| Abstract: | Dissolved humic material from three locations on the Ogeechee River Estuary near Savannah, GA, was ultrafiltered into three size fractions and used for kinetic experiments with Cu(II). A Cu(II)-humic mixture was reacted with a colorimetric reagent for Cu(II) and absorbance observed from 50 msec to at least 1835 sec corresponding to rate constants from 0.001–40 sec?1. The apparent dissociation rate constants were distributed over a wide range, with most bound Cu(II) having k > 1 sec?1 (). Nearly all the variation seen in the kinetic distribution was among size fractions; as size fraction decreased, the distribution of bound Cu(II) shifted to larger rate constants. Location of sampling stations on the estuary had little effect on results. |
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