Abstract

LOSINNO, Beatriz N; SAINATO, Claudia M; MALLEVILLE, Horacio J  and  GALINDO, Griselda. Electrical resistivity tomography applied to the characterization of contaminated sites at dairies. Cienc. suelo [online]. 2008, vol.26, n.2, pp.141-152. ISSN 1850-2067.

Groundwater quality at dairies, used for animal consumption, may have incidence on milk quality, for which it is important to know the effect of wastes lixiviation on soil and groundwater. The aim was to detect anomalies of electrical conductivity at non saturated and saturated zone, by means of electrical resistivity tomography, at potentially contaminated sites at two dairies at Venado Tuerto (Santa Fe Province, Argentina) and at Carmen de Areco (Buenos Aires Province, Argentina), and its relationship with physico-chemical properties of soil and groundwater. In Carmen de Areco, a silty laomy soil with clay horizon (Bt), the most critical site, the corral near the milking house had an anomaly of electrical conductivity of 60% at non saturated zone relative to the background soundings, while the feeding zone which is periodically moved within the lots was not affected. In Venado Tuerto, a sandy loamy soil of thicker texture, the feeding zone with an anomaly of 84% and an animal charge prolonged in time, and the surroundings of the lagoon of effluents had great content of salts. In both cases, the salinity was associated with high concentration of nitrates, phosphorous and sulphates from the animal effluents.

Keywords : Electrical resistivity tomography; Dairy farm; Contamination; Soils; Groundwater.

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