Journal
ENVIRONMENTAL EARTH SCIENCES
Volume 69, Issue 7, Pages 2211-2225Publisher
SPRINGER
DOI: 10.1007/s12665-012-2049-5
Keywords
Groundwater quality; Agricultural irrigation; Groundwater suitability; Groundwater evolution; Ion exchange
Funding
- Doctoral Postgraduate Technical Project of Chang'an University [CHD2011ZY025, CHD2011ZY022]
- special Fund for Basic Scientific Research of Central Colleges, Chang'an University [CHD2011ZY020, CHD2012TD003]
- National Natural Science Foundation of China [40772160, 41172212]
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Groundwater is an important water source for agricultural irrigation in Penyang County. Some traditional methods such as irrigation coefficient, sodium adsorption ratio, total alkalinity, total salinity and total dissolved solids were employed to assess groundwater quality in this area. In addition, an improved technique for order preference by similarity to ideal solution model was applied for comprehensive assessment. The origin of major ions and groundwater hydrogeochemical evolution was also discussed. Groundwater in Penyang County contains relative concentrations of dominant constituents in the following order: Na+ > Ca2+ > Mg2+ > K+ for cations and HCO3 (-) > SO4 (2-) > Cl- > CO3 (2-) for anions. Groundwater quality is largely excellent and/or good, suggesting general suitability for agricultural use. Calcite and dolomite are found saturated in groundwater and thus tend to precipitate out, while halite, fluorite and gypsum are unsaturated and will dissolve into groundwater during flow. Groundwater in the study area is weathering-dominated, and mineral weathering (carbonate and silicate minerals) and ion exchange are the most important factors controlling groundwater chemistry.
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