<p><p><strong>Reference(s):</strong></p><p><em>DeJong et al. (2010)</em></p><p><strong>Method Summary</strong></p><p>Resistivity can supply a measure of the voltage potential gradient through a soil matrix when an electrical current is applied across a soil specimen. Volume fractions of particles and voids, particle composition, soil particle specific surface area, and degree of saturation can affect measurement of resistivity. In bio-treated soils, the volume of precipitated calcite will decrease the resistivity. Resistivity measurements are able to detect change of soil density, soil compression, and biological activity.<br><p style="text-align: center;"><strong>Ω= ε/<em>J</em></strong></p><p style="text-align: center;"> where,</p><p style="text-align: center;">Ω = resistivity</p><p style="text-align: center;">ε = electric field</p><p style="text-align: center;"><em> J </em>= current density</p>&nbsp;</p><p><strong>Accuracy and Precision</strong></p><p>The accuracy and precision of this method are medium.</p><p><strong>Adequacy of Coverage</strong></p><p>The adequacy of coverage of this method is medium.</p><p><strong>Implementation Requirements </strong></p><p>This method has medium implementation requirements. The resistivity measurement is required.</p><p><strong>General Comments</strong></p><p>The volume change of precipitated calcite could influence the resistivity, and some bio-treatments are focused on calcite precipitation. Thus, this method can detect the variation of soil density, biological activity, and soil compression.</p></p>