Copper dissociation from estuarine humic materials

Details Copper dissociation from estuarine humic materials Copper dissociation from estuarine humic materials

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1371o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 6, pp.1371-1375

Physics

2

Scientific paper

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 ( t 1/2 < 0.7 sec ). 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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