Uranium distribution in the coastal waters and pore waters of Tampa Bay, Florida

被引:34
作者
Swarzenski, Peter W.
Baskaran, Mark
机构
[1] US Geol Survey, St Petersburg, FL 33701 USA
[2] Wayne State Univ, Detroit, MI 48202 USA
关键词
uranium; pore water; estuary; river water; seawater; non-conservative; submarine groundwater discharge;
D O I
10.1016/j.marchem.2006.05.002
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The geochemical reactivity of uranium (U-238) and dissolved organic carbon (DOC), Fe, Mn, Ba, and V was investigated in the water column, pore waters, and across a river/estuarine mixing zone in Tampa Bay, Florida. This large estuary is impacted both by diverse anthropogenic activity and by extensive U-rich phosphatic deposits. Thus, the estuarine behavior of uranium may be examined relative to such known U enrichments and anthropogenic perturbations. Dissolved (< 0.45 m) uranium exhibited both removal and enrichment processes across the Alafia River/estuarine mixing zone relative to conservative mixing. Such non-conservative U behavior may be attributed to: i) physical mixing processes within the river; ii) U carrier phase reactivity; and/or iii) fluid exchange processes across sediment/water interface. In the bay proper, U concentrations were similar to 2 to 3 times greater than those reported for other estuarine systems and are likely a result of erosional inputs from the extensive, underlying U-rich phosphatic deposits. Whereas dissolved U concentrations generally did not approach seawater values (13.6 nM) along the Alafia River salinity transect, water column U concentrations exceeded 16 nM in select regions of the bay. Within the hydrogeological framework of the bay, such enriched U may also be derived from advective fluid transport processes across the sediment/water interface, such as submarine groundwater discharge (SGD) or hyporheic exchange within coastal rivers. Pore water profiles of U in Tampa Bay show both a flux into and out of bottom sediments, and average, diffusive U pore water fluxes (J(diff)) ranged from -82.0 to 116.6 mol d(-1). It is likely that negative U fluxes imply seawater entrainment or infiltration (i.e., submarine groundwater recharge), which may contribute to the removal of water column uranium. For comparison, a bay-wide, Ra-derived submarine groundwater discharge estimate for Tampa Bay (8 L m(-2) d(-1)) yielded an average, advective (J(SGD)) U flux of 112.9 mol d(-1). In Tampa Bay, the estuarine distribution of U indicates a strong natural, geologic control that may also be influenced by enhanced fluid transport processes across the sediment/water interface. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:43 / 57
页数:15
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