Natural radionuclides may be indicators for dense mineral
placers along marine shorelines. Relict beach and river deposits
occur in continental shelf sediments. These deposits result from the
reworking of beach sands by wave action during the Holocene Transgression.
Some dense, resistant minerals associated with placer
deposits are known to contain...
The research presented in this thesis evaluated the effects of
uranyl (UO₂⁺⁺) upon the absorption of Li, Na, K, Rb, and Cl. Due
to the biological importance of Na and K, these two ions were
studied in the greatest detail.
The results of this research showed that, at UO₂⁺⁺ concentrations...
A countercurrent, liquid-solids contactor was constructed,
operated and evaluated for a continuous ion-exchange operation.
The exchange of cupric and sodium ions between aqueous solutions
and Dowex 50W-X8 ion exchange resin was studied.
The countercurrent contactor consisted of two, three-inch
diameter columns with active sections ranging from one to four feet...
Rates of benthic O₂ exchange are important measurements for determining organic matter remineralization, and can shed light on factors driving biogeochemical processes in coastal environments. Measurement of in situ O₂ consumption and production within permeable sediments, such as those found over ~43% of the Oregon-Washington shelf, has traditionally been done...