Imaging Brilliant Blue Stained Soil by Means of Electrical Resistivity Tomography (original) (raw)

Vadose Zone Journal, 2009

Abstract

ABSTRACT Temporal mapping of the three-dimensional spatial distribution of solute transport in soils is needed for an improved understanding of the underlying processes. Numerous studies have confirmed that Brilliant Blue imaging provides spatially highly resolved information on solute transport In soils. A drawback of the method, however, is its destructive character, which prevents three-dimensional mapping of the temporal evolution of Brilliant Blue plumes or fronts. In this study, we determined that the negative ionic charge of the Brilliant Blue molecule for moderately acid and basic environments provides an electrical conductivity contrast that can be detected by means of time domain reflectometry (TDR) and electrical resistivity tomography (ERT). Time-lapse ERT supplies three-dimensional spatiotemporally resolved image data through minimally invasive measurements but with limited spatial resolution. A joint application of Brilliant Blue imaging and (time-lapse) ERT offers pote

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