title: Survey of trace metals in drinking water supplied to rural populations in the eastern Llanos of Venezuela.
abstract: To ascertain the water quality for human consumption, chemical parameters such as pH, conductivity and total dissolved calcium, magnesium, iron, aluminum, zinc, copper and manganese were measured during four sampling periods (November 2002; March, May and July 2003) in drinking water wells which supply several forest camps and rural populations located in the eastern Llanos of Venezuela. Copper levels in drinking water in November 2002 were found to be significantly higher (P<0.05) than the other assessed periods. Temporal variations of the other parameters considered were not statistically significant. Calcium and magnesium concentrations were found to be extremely low (mean concentration+/-S.D. of 0.27+/-0.25mg/l for Ca and 0.219+/-0.118 for Mg) during the four sampling periods, probably because of the carbonate bearing scarcity in the soils lithic component. The rest of the metals complied with the Venezuelan and International guidelines of quality criteria for drinking water.
authors.affiliation: Laboratorio de Fisicoquímica, Estación de Investigaciones Hidrobiológicas de Guayana, Fundación La Salle de Ciencias Naturales, San Félix 8051, Estado Bolívar, Venezuela. abrahan.mora@fundacionlasalle.org.ve
authors.forename: Abrahan
authors.initials: A
authors.lastname: Mora
authors.forename: César
authors.initials: C
authors.lastname: Mac-Quhae
authors.forename: Malvis
authors.initials: M
authors.lastname: Calzadilla
authors.forename: Luzmila
authors.initials: L
authors.lastname: Sánchez
mesh_terms: D006801:Humans; D008670:Metals / Q000032:analysis*; D012424:Rural Population; D013054:Spectrophotometry, Atomic; D014131:Trace Elements / Q000032:analysis*; D014687:Venezuela; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014131:Trace Elements; D014874:Water Pollutants, Chemical