On the pore water chemistry effect on spectral induced polarization measurements in the presence of pyrite

Edmundo Placencia-Gómez, Lee Slater

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

In order to expand the application of the induced polarization (IP) method as a technique for monitoring metallic mineral dissolution and precipitation mechanisms, we studied the effects of variations in pore water chemistry on the spectral induced polarization (SIP) response of a mixture of silica-sand and pyrite particles in the laboratory. We investigated the dependence of the SIP response on both pore water conductivity and pH for various chemical compositions: redox-passive (P) versus redox-active (A) ions, using CaCl2 as P-ions, and FeSO4 and FeCl3 as A-ion brines. The effect of pore water chemistry was evaluated by means of a recently proposed volumetric specific capacitance model. The SIP response (IP-effect) was primarily determined by the pore water conductivity and the specific capacitance was only weakly dependent on the chemical composition and pHw. We found that the specific capacitance varies to first order over a limited range and approximates a single value (≈ 302 F m− 3 in average). However, variations in the specific capacitance as a function of active versus inactive ion chemistry might be important to consider when using IP to monitor specific mineral dissolution and precipitation processes.

Original languageEnglish (US)
Pages (from-to)474-485
Number of pages12
JournalJournal of Applied Geophysics
Volume135
DOIs
StatePublished - Dec 1 2016

All Science Journal Classification (ASJC) codes

  • Geophysics

Keywords

  • Induced polarization
  • Oxidation–dissolution
  • Redox-active ion
  • Redox-passive ion
  • Specific capacitance

Fingerprint Dive into the research topics of 'On the pore water chemistry effect on spectral induced polarization measurements in the presence of pyrite'. Together they form a unique fingerprint.

  • Cite this