Abstract

PEREZ MORENO, Fidel et al. Chemical characterization of groundwaters in wells and a water distributor of Zimapan State of Hidalgo, Mexico. Hidrobiológica [online]. 2003, vol.13, n.2, pp.95-102. ISSN 0188-8897.

The characterization of the ground waters that supply the general distributor of water of Zimapán city, State of Hidalgo, Mexico and the distributor itself, is carried out in this work. Eleven sampling points have been selected in which 28 physical-chemical parameters of the collected water have been determined during 10 samplings distributed along one year (March of 1999-March of 2000). In general these waters present normal physical-chemical properties and are classified as bicarbonated-calcic and bicarbonated-mixed waters, with low levels of sulfates, chlorides, sodium and potassium; with very high concentrations of As up to 550 µg· l^-1, exceeding in more than 10 times the norm NOM-127-SSA1-1994 for drinking water (Secretaria de Salud, 1996). The study of temporal variation showed significant seasonal variations with an increase in the concentrations of the total elements during the months of February and March (season of scarce rains) and a decrease in the months of April to July (season of rains), this is probably due to dilution effects caused by pluvial precipitation, which is infiltrated to the phreatic mantle. In addition, the supply wells and the points of sampling of the general distributor were correlated by means of a multi-varied analysis of physical-chemical properties.

Keywords : Groundwaters; drinking waters; Zimapán; hidrochemical parameters; arsenic; water quality.