Electrical Resistivity Tomography and Electromagnetic Soundings for Exploration of Glyphosate in Soil and Groundwater
C.M. Sainato, B.N. Losinno, H.J. Malleville, A.F. Lemeillet, R.A. Espada and E.A. Pagano
Event name: First Conference on Proximal Sensing Supporting Precision Agriculture
Session: Integration of Proximal Sensing and Geophysics
Publication date: 06 September 2015
Info: Extended abstract, PDF ( 906.52Kb )
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The glyphosate is an herbicide which is widely used in Argentina. The impact of its application on soil and groundwater is still unknown. The objective of the paper was to identify, anomalies of apparent electrical conductivity ECa associated with the presence of glyphosate in the soil or groundwater. Electrical resistivity tomography (ERT) and electromagnetic (EMI) soundings were performed at a rural zone: a background site without any application of the herbicide (Chac), another plot with application of glyphosate (Ran), and another plot (Scho) at a zone with frequent application of the herbicide. The results of ECa in the soil obtained with both methods do not show great contrasts between Chac and Ran. At Scho, the values of ECa were greater than other sites, 70.5 mS/m (EMI) and 60 mS/m (ERT). Glyphosate reached 52 ng/g in soil and 0.94 ng/l in groundwater. The increase of the apparent electrical conductivity was mainly associated with the site that has been exposed to glyphosate application steadily over time, through the sprays that are made around it.