| dc.contributor.advisor |
Reible , Danny D . |
|
| dc.contributor.committeeMember |
Katz , Lynn E . |
|
| dc.creator |
Chess , Timothy William |
|
| dc.date.accessioned |
2010 -12 -21T16 :26 :16Z |
|
| dc.date.accessioned |
2010 -12 -21T16 :26 :22Z |
|
| dc.date.accessioned |
2011 -08 -16T15 :50 :37Z |
|
| dc.date.available |
2010 -12 -21T16 :26 :16Z |
|
| dc.date.available |
2010 -12 -21T16 :26 :22Z |
|
| dc.date.available |
2011 -08 -16T15 :50 :37Z |
|
| dc.date.created |
2010 -08 |
|
| dc.date.issued |
2010 -12 -21 |
|
| dc.date.submitted |
August 2010 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /2152 /ETD -UT -2010 -08 -1942 |
|
| dc.description.abstract |
Diffusive gradients in thin film (DGT ) technique is applied to determine pore water mercury concentrations in river sediments . DGT devices have been a useful indicator of dissolved metals in aqueous systems , although it is not as well developed for measuring mercury . DGT devices were evaluated for three different ion exchange resins for adsorption of mercury . After a series of laboratory experiments , 3 -Mercaptopropyl Functionalized Silica Gel (3M ) was chosen as an effective resin layer . Laboratory experiments showed that the resin strongly associated with dissolved Hg²⁺ . DGT probes were tested with sediments from the South River (Virginia , USA ) in the laboratory and the time dependent deployment verified an uptake of mercury to the probes and established an effective diffusion coefficient for site specific utilization . Multiple piston and sediment probes were deployed in the South River in -situ to determine overlying water Hg concentrations and sediment pore water Hg concentration profiles . The DGT devices were successful in measuring Hg concentrations in -situ . |
|
| dc.format.mimetype |
application /pdf |
|
| dc.language.iso |
eng |
|
| dc.subject |
DGT |
|
| dc.subject |
Mercury |
|
| dc.subject |
Sediment pore water |
|
| dc.title |
Laboratory optimization and field demonstration of diffusive gradients in thin films for in -situ mercury measurements of river sediments |
|
| dc.description.department |
Civil , Architectural , and Environmental Engineering |
|
| dc.type.genre |
thesis |
* |
| dc.type.material |
text |
* |
| thesis.degree.name |
Master of Science in Engineering |
|
| thesis.degree.level |
Masters |
|
| thesis.degree.discipline |
Environmental and Water Resources Engineering |
|
| thesis.degree.grantor |
University of Texas at Austin |
|
| thesis.degree.department |
Civil , Architectural , and Environmental Engineering |
|
| dc.date.updated |
2010 -12 -21T16 :26 :22Z |
|