Hydrochemistry of groundwater in the Duero River basin and regulations for domestic use

Daniela Inocencio-Flores, Martha Alicia Velázquez-Machuca, José Luis Pimentel-Equihua, José Luis Montañez-Soto, José Venegas-González

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This work was carried out in the Duero River basin, in the northwest portion of the State of Michoacdn. Its main objective was to evaluate the chemical composition of groundwater for domestic use, with an emphasis on heavy metals due to their potential effects on human health. Regulations for drinking water quality control were reviewed so as to discuss the implications and limitations of their implementation based on the results obtained. The physicochemical composition of samples from 17 sites was analyzed on two different sampling dates to determine pH, EC, t(oC), major ions and heavy metals using standard methodologies. Data was processed using multivariate statistical analysis techniques (principal components analysis, PCA). EC varied from 135 to 880 mS cm-land pH ranged from 6.28 to 7.83. The main water families found were: magnesium-bicarbonate, calcium-bicarbonate and sodium-calcium-bicarbonate. Zn, Mn, Cu and Fe concentrations were within safe limits for human consumption. Pb was detected at all the sampling sites and exceeded the maximum allowable limits for human consumption. The factors associated with the source of the chemical components of the water were: basaltic rocks with olivine and feldspars minerals and calcite. Pb concentration was associated with volcanic clasts (siliceous sands).
Original languageAmerican English
Pages (from-to)111-126
Number of pages98
JournalTecnologia y Ciencias del Agua
StatePublished - 1 Jan 2013

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