Electrical properties of iron-sand columns: Implications for induced polarization investigation and performance monitoring of iron-wall barriers

Geophysics - Tập 70 Số 4 - Trang G87-G94 - 2005
Lee Slater1, Jaeyoung Choi1, Yuxin Wu1
1Rutgers University, Department of Earth & Environmental Sciences, Newark, New Jersey 07102..

Tóm tắt

We investigate the electrical response (0.1–1000 Hz) of reactive iron barriers by making measurements on zero valent iron ([Formula: see text])-sand columns under the following conditions: (1) variable [Formula: see text] surface area (0.1–100% by volume [Formula: see text] under constant electrolyte chemistry; (2) variable electrolyte activity (0.01–1 mol/liter), valence (mono trivalent), and pH under constant [Formula: see text]-sand composition; and (3) forced precipitation of iron hydroxides and iron carbonates on the [Formula: see text] surface. We model the measurements in terms of conduction magnitude, polarization magnitude, and polarization relaxation time. Our key findings are: (a) Polarization magnitude exhibits a linear relation to the surface area of [Formula: see text], whereas conduction magnitude is only weakly dependent on the [Formula: see text] concentration below 30% by volume [Formula: see text]. (b) Polarization magnitude shows a power law relation to electrolyte activity, with exponents decreasing from 0.9 for monovalent solutions to 0.7 for trivalent solutions. (c) The relaxation time parameter depends on activity and valence in a manner that is partly consistent with the variation in double layer thickness predicted from theory. (d) pH exerts minor control on the electrical parameters. (e) Polarization magnitude and relaxation time both increase as a result of precipitation induced on the surface of [Formula: see text]. Our results show that induced polarization parameters systematically change in response to changes in the [Formula: see text]-electrolyte interfacial chemistry.

Từ khóa


Tài liệu tham khảo

Allison, J. D., D. S. Brown, and K. J. Novo-Gradac, 1990, MINTEQ-A2/PRODEFA2: A geochemical assessment model for environmental systems, version 3.0 user's manual: Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency.

Archie G. E., 1942, Transactions of the American Institute of Mineral, Metallurgy and Petroleum Engineers, 146, 54

10.1046/j.1365-246X.1999.00805.x

Börner F. D., 1991, Log Analyst, 32, 612

10.1063/1.1750906

10.1190/1.1444738

Endres, A. L., S. D. Piggott, and J. D. Redman, 2000, Characterization of reactive treatment zones containing granulated iron using induction logging: 7th International Symposium on Borehole Geophysics for Minerals, Geotechnical and Groundwater Applications, Mineral and Geotechnical Logging Society, Proceedings, 1–8.

Gavaskar A. R., 1998, Permeable reactive barriers for groundwater remediation

10.1111/j.1745-6584.1994.tb00935.x

10.1190/1.1439079

10.1016/B978-0-08-009272-0.50012-1

Kemna, A., 2000, Tomographic inversion of complex resistivity — Theory and application: Der Andere Verlag.

Knight, R., and A. L. Endres, 2005, Introduction to rock physics for near-surface applications in near-surface geophysics: SEG.

10.1029/2000JB900392

10.1029/2000JB900402

Lesmes, D. P., J. Sturrock, and K. M. Frye, 2000, A physiochemical interpretation of the Cole-Cole dielectric model: Symposium on the Application of Geophysics to Engineering & Environmental Problems, Proceedings 533–543.

10.1016/S0304-3894(99)00029-1

10.1190/1.1441880

Pelton W. H., 1983, Geophysical Transactions, 29, 297

10.1190/1.1440839

Schön J. H., 1996, Physical properties of rocks — Fundamentals and principles of petrophysics

10.1190/1.1444244

10.1190/1.1441215

10.1190/1.1581043

10.1029/2001WR001075

Sposito G., 1989, The chemistry of soils

Stumm W., 1996, Aquatic chemistry: Chemical equilibria and rates in natural waters

10.1190/1.1443222

10.1190/1.1441755

Wait J. R., 1982, Geo-electromagnetism

Waxman M. H., 1968, Transactions of the American Institute of Mineral, Metallurgy & Petroleum Engineers, 243, 107

10.1190/1.1441005

Thông tin
Thông tin xuất bản

Geophysics

Tập 70 Số 4

G87-G94

Thông tin tác giả