Now showing items 21-30 of 30
Environmental trends of contaminants from the Mississippi River Delta, Tampa Bay, and Galveston Bay sediment cores
No abstract available
Spectrophotometric determination of total uronic acids in seawater using cation-exchange separation and pre-concentration by lyophilization
(, 2001 Jan 1)
A technique is described for the measurement of total uronic acids in coastal seawater using a spectrophotometric method after separation and pre-concentration. Uronic acids in seawater are separated through cation-exchange ...
An ultraclean cross-flow ultrafiltration technique for the study of trace metal phase speciation in seawater
(, 1996 Nov)
A series of laboratory and field studies were conducted to test suitability and optimal sampling conditions of an Amicon ultrafiltration system for the collection of colloidal material for trace metal phase speciation ...
Sensitive determination of dissolved sulfide in estuarine water by solid-phase extraction and high-performance liquid chromatography of methylene blue
(, 2000 Jun 2)
A sensitive method involving solid-phase extraction and HPLC analysis of methylene blue has been developed to measure nanomolar levels of dissolved sulfide in oxic surface waters. The procedure included 1) a preconcentration ...
Silver in river and estuarine waters of Texas: Evidence for complexation to macromolecular organic matter
(, 1996 199)
Concentration and phase speciation of Ag in selected Texas rivers and in the Trinity River estuary were measured in order to establish the major factors which control its fate in the aquatic environment from source to sink. ...
Historical contamination of PAHs, PCBs, DDTs, and heavy metals in Mississippi River Delta, Galveston Bay and Tampa Bay sediment cores
(, 2001 Jul)
Profiles of trace contaminant concentrations in sediment columns can be a natural archive from which pollutant inputs into coastal areas can be reconstructed. Reconstruction of historical inputs of anthropogenic chemicals ...
Complexation of silver by macromolecular organic sulfur complexes in estuarine waters of Galveston Bay
(, 1997 200)
Studies are currently being conducted which have the objectives of gaining a better understanding of the degree of organic complexation of Ag in fresh and estuarine waters by relating the ambient concentration of stable ...
Colloidal pumping: Evidence for the coagulation process using natural colloids tagged with Hg-203
(, 1996 Nov)
Colloids isolated from waters of the Trinity River (Texas) were tagged with high specific activity mercury (Hg-203) and re-equilibrated with ultrafiltered water and particles. The transfer of radioisotopic Hg from the ...
Benthic exchange of nutrients in Galveston Bay, Texas
(, 2000 Oct)
Nutrient regeneration rates were determined at three sites increasing in distance from the Trinity River, the main freshwater input source, to Galveston Bay, Texas, from 1994 through 1996. Diffusive fluxes generally agreed ...
Fibrillar polysaccharides in marine macromolecular organic matter as imaged by atomic force microscopy and transmission electron microscopy
(, 1998 Jul)
A consensus is now emerging that the structure of organic macromolecules will determine their function in aquatic systems. Transmission electron microscopy (TEM) is a widely used technique to study the morphology of ...