Author:
Ellwood Michael J.,Ellwood Michael J.,Hunter Keith A.,Hunter Keith A.,Kim Jonathan P.,Kim Jonathan P.
Abstract
A study of zinc complexation in Lakes Manapouri and Hayes revealed that zinc
speciation in both lakes is dominated by its complexation to natural organic
ligands. In Lake Manapouri, dissolved zinc concentrations increased from 0.9
nM in surface waters to ~1.4 nM at depth. Ligand concentrations for this
lake were relatively uniform with depth, with values ranging between 2.9 and
4.2 nM. A similar ligand concentration was measured for Lake Hayes, which had
a surface zinc concentration of 0.46 nM. Conditional stability constants (log
K) for the complexation of zinc to these ligands were high,with values ranging
between 10.0 and 11.1. Calculated free Zn 2+
concentrations for both lakes were in the low picomolar range (5—48
pM). Such low free Zn 2+ levels may limit the
growth of some phytoplankton in both lakes.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
13 articles.
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