GEOC 107 |
| Chelsea Campbell1, Cathleen J. Webb1, Gretchen E. Berryman1, Jenifer Sorensen2, Arden D. Davis2, Roberta Fivecoate2, David Dixon3, Terrence Williamson4, and Sreedevi Dawadi1. (1) Chemistry, Western Kentucky University, 1 Big Red Way, Bowling Green, KY 42101, (2) Geology and Geological Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St., Rapid City, SD 57701, (3) Chemistry and Chemical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph, Rapid City, SD 57701, (4) HydroTech Engineering, LLC, 3115 Stockade Dr, Rapid City, SD 57702 |
| Arsenic in surface water and ground water is of great concern because of potential toxic effects in drinking water supplies. Current remediation technologies are expensive and will place increased socio-economic pressure on rural America, primarily because of the lack of inexpensive point-of-source treatment technology. Laboratory water treatment (batch and column) experiments with various types of modified limestones indicate significant retention of arsenic but showed some regional variations. Under highly concentrated arsenic solutions, precipitates of arsenic-containing minerals on the limestone were observed with scanning electron microscopy (SEM). The formation of precipitates is likely due to the formation of outer-sphere complexes and is facilitated by the high surface area and high surface pH of the limestone minerals. Surface area measurements are also presented. The influence of trace elements in the limestone is being investigated. |
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Poster Session
6:00 PM-9:00 PM, Tuesday, March 30, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Geochemistry |