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Spatial Distribution of Solutes in Aquifer Outcrop Zones along the Brazos River, East-Central Texas | ||
| International Journal of Environmental Research | ||
| مقاله 3، دوره 5، شماره 3، مهر 2011، صفحه 595-602 اصل مقاله (240.62 K) | ||
| شناسه دیجیتال (DOI): 10.22059/ijer.2011.366 | ||
| نویسنده | ||
| P.F. Hudak* | ||
| Department of Geography and Environmental Science Program, University of North Texas 1155 Union Circle #305279, Denton, TX 76203-5017, USA | ||
| چکیده | ||
| Concentrations of several solutes – nitrate, arsenic, sulfate, boron, chloride, and bromide – along with total dissolved solids (TDS) in ten counties bordering the Brazos River in east-central Texas were compiled, mapped, and analyzed relative to regional land use and geology. Agriculture and oil/gas production are major activities and potential sources of groundwater contamination in the study area. Data were compiled from 104 water wells with a median depth of 446 ft (136 m) in the outcrop zones of six sedimentary aquifers: Carizzo-Wilcox, Queen City, Sparta, Yegua-Jackson, Gulf Coast, and Brazos Alluvium. Only two observations surpassed the 44.3 mg/L drinking water standard for nitrate, and four observations exceeded the 10 ug/L standard for arsenic. The median chloride concentration was 53 mg/L; however, the maximum level was almost three times the secondary drinking water standard of 250 mg/L. Chloride, bromide, sulfate, and boron concentrations resembled TDS patterns, with numerous samples exceeding secondary TDS drinking water standards in the Yegua-Jackson Aquifer. Most chloride/bromide ratios were between 100 and 300. Overall, results of this study suggest that natural processes exert a primary control on solute concentrations in the above aquifers, with a potential for modest anthropogenic impacts from agriculture and oil/gas production. | ||
| کلیدواژه‌ها | ||
| Brazos River؛ Texas؛ Groundwater؛ agriculture؛ Oil/gas production | ||
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