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  • One century of arsenic expo...
    Bundschuh, Jochen; Litter, Marta I.; Parvez, Faruque; Román-Ross, Gabriela; Nicolli, Hugo B.; Jean, Jiin-Shuh; Liu, Chen-Wuing; López, Dina; Armienta, María A.; Guilherme, Luiz R.G.; Cuevas, Alina Gomez; Cornejo, Lorena; Cumbal, Luis; Toujaguez, Regla

    The Science of the total environment, 07/2012, Volume: 429
    Journal Article

    The global impact on public health of elevated arsenic (As) in water supplies is highlighted by an increasing number of countries worldwide reporting high As concentrations in drinking water. In Latin America, the problem of As contamination in water is known in 14 out of 20 countries: Argentina, Bolivia, Brazil, Chile, Colombia, Cuba, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Peru and Uruguay. Considering the 10μg/L limit for As in drinking water established by international and several national agencies, the number of exposed people is estimated to be about 14million. Health effects of As exposure were identified for the first time already in the 1910s in Bellville (Córdoba province, Argentina). Nevertheless, contamination of As in waters has been detected in 10 Latin American countries only within the last 10 to 15years. Arsenic is mobilized predominantly from young volcanic rocks and their weathering products. In alluvial aquifers, which are water sources frequently used for water supply, desorption of As from metal oxyhydroxides at high pH (>8) is the predominant mobility control; redox conditions are moderate reducing to oxidizing and As(V) is the predominant species. In the Andes, the Middle American cordillera and the Transmexican Volcanic Belt, oxidation of sulfide minerals is the primary As mobilization process. Rivers that originate in the Andean mountains, transport As to more densely populated areas in the lowlands (e.g. Rímac river in Peru, Pilcomayo river in Bolivia/Argentina/Paraguay). In many parts of Latin America, As often occurs together with F and B; in the Chaco–Pampean plain As is found additionally with V, Mo and U whereas in areas with sulfide ore deposits As often occurs together with heavy metals. These co-occurrences and the anthropogenic activities in mining areas that enhance the mobilization of As and other pollutants make more dramatic the environmental problem. ► In Latin America, As of predominantly geogenic origin in water is known in 14 out of 20 countries. ► Considering the 10 μg/L limit for As in drinking water, the number of exposed people is estimated to be about 14 million. ► Although health effects were identified in the 1910s, As has been detected in most countries only in the last 10–15 years. ► Arsenic occurs naturally by mobilization from volcanic rocks and desorption from metal oxyhydroxides at high pH. ► Anthropogenic activities in mining areas enhance As mobilization and make more dramatic the environmental problem.