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- Title
Hydrochemistry of the aquifers in the Rio las Avenidas basin, Pachuca, Hidalgo, Mexico
- Authors
Huizar-Alvarez, R.
- Abstract
Groundwater in the Rio de las Avenidas sub-basin corresponds to the bicarbonate-sodium and bicarbonate-calcium hydrochemical facies, which result from the mineralization of water passing through alkaline rocks (andesites) which prevail in this basin. However, the presence ofhigh concentrations of Na+ and K+ reveals the existence of an external inflow of these elements: the registered mean values are respectively 94.3 and 19.0 ppm, with the Tellez and Tizayuca areas standing out with reported values of up to 142 ppm. As forthe concentration of soluble water cations, we find in decreasing order: Na+, Ca+, Mg2+, K+, along with the anions HCO3-, Cl-, SO42-, CO3-, which combine to form the NaHCO3, NaCl, Ca(HCO3)2,MgSO4 and KCl salts. The presence of biological contaminants, P and detergents in the groundwater indicates that it may have been contaminated by waste water. In addition to the contaminants mentioned above, large quantities of Pb, B, Zn, Fe, Mn, Cr, Co were detected and although Fe, Pb, Zn, B, and Mn are closely related to the local lithology, the high concentrations of these elements along with the occurrence of Co, Cr, Cd, and Ni confirm the gradual degradation ofthe aquifers in the sub-basin. The water temperature indicates the existence of low temperature thermal processes in the area.
- Subjects
HYDROLOGY; GROUNDWATER monitoring
- Publication
Water, Air & Soil Pollution, 1997, Vol 96, Issue 1-4, p185
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/BF02407204