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Hidrobiológica

versão impressa ISSN 0188-8897

Resumo

DOTOR ALMAZAN, Azucena; ARMIENTA HERNANDEZ, María Aurora; ARCEGA CABRERA, Flor  e  TALAVERA MENDOZA, Oscar. Arsenic and metals transport processes in surface waters from the mining district of Taxco, Mexico: Stable isotopes application. Hidrobiológica [online]. 2014, vol.24, n.3, pp.245-256. ISSN 0188-8897.

Water isotopic ratios 18O/16O, 2H/H and 34S/32S in dissolved sulfates were measured to determine sulfur provenance and dominant processes of transport, and, distribution of As and metals in surface waters in the mining district of Taxco. Zinc, Cd, Cu, Fe, Pb and As were analyzed in river and stream waters located nearby mine tailings. δ18O and δD values (dry season) showed a lower slope (δD=3.998 * δ18O-29.02) than the Global Meteoric Water Line (GMWL, δD=8 * δ18O + 10) indicating an evaporation process. In the rainy season, the slope (δD=6.109 * δ18O-9.69) approximates to the GMWL showing an input of meteoric water to rivers. δ34S values in dissolved sulfates vary from -6.8 to +2.2% (dry season) and from -5 to -0.6% (rainy season), indicating a sulfur source from sulfides oxidation and erosion. Clustering analysis showed that rivers and streams conditions are very similar to those of the tailings in the dry season, but not in the rainy season, with exception of TX3. This similitude exhibits the significance of seasonal changes in weathering and washing off processes from tailings, with further transport by runoff into surrounding water bodies. Variation in metal concentrations (dry and rainy seasons) indicates two-coupled processes: 1) discharge-erosion and 2) proportional dilution. Plot of δ18O vs δ34S confirms weathering of material from the basin and tailings with a wide and heterogeneous pattern in the dry season, while in the rainy season results indicate erosion and mixing of particles.

Palavras-chave : Erosion; evaporation; metals; tailings.

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