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Two studies concerning rare earth elements : I. Rare earth DTPA complexes as estuarine hydrological tracers : II. Rare earth elemental concentrations in some Pacific Northwest rivers

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Title Two studies concerning rare earth elements : I. Rare earth DTPA complexes as estuarine hydrological tracers : II. Rare earth elemental concentrations in some Pacific Northwest rivers
Names Keasler, Kenneth M. (creator)
Loveland, Walter D. (advisor)
Date Issued 1983-06-30 (iso8601)
Note Graduation date: 1984
Abstract Two studies were conducted involving rare earth elements. In the
first study, the use of rare earth diethylenetriaminepentaacetic acid
(DTPA) complexes as stable actiable tracers, a method of stable-isotope
tracing with post-sampling neutron activation analysis, was explored.
The persistence of rare earth DTPA complexes in estuarine waters was
measured in simulated laboratory studies and in two field studies conducted
in the South Shore Marina in Newport, Oregon. The ability to use
more than one rare earth DTPA tracer simultaneously in a multitracing
experiment was also tested in one field experiment.
In the second study, theoretical calculations, laboratory experiments,
and field experiments were used to study the solubility of the
rare earth elements in river water. The field experiments consisted of
measuring the soluble rare earth elemental concentrations for seven
Pacific Northwest rivers (Columbia, Fraser, Klamath, Mary's, Rougue,
Sacramento, and Willamette) using radiochemical neutron activation
analyses. The laboratory experiments consisted of measuring the soluble
rare earth elemental concentrations in a mixture (sediments and water)
from the Columbia or Willamette River as the pH was changed from 6 to
8. Also, the absorption of Tm on Willamette River sediments was studied.
The theoretical calculations of the solubility of the lanthanum and
europium in river water were based upon the solubility of the rare earth
phosphate and the speciation of the rare earth elements in rivers.
Results of these calculations, using measured field data, were compared
to the measured lanthanum and europium concentrations in the river Aare.
The results of these studies are consistent with the interpretation that
the soluble rare earth elemental concentrations in river water are controlled
by the solubility of the rare earth phosphate and the speciation
of the rare earth elements with most of the soluble rare earth elements
associated with humic substances.
Genre Thesis/Dissertation
Topic Earths, Rare
Identifier http://hdl.handle.net/1957/41191

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