Characterization of frequency‐dependent magnetic susceptibility in UXO electromagnetic geophysics

Meglich, Todd; Li, Yaoguo; Pasion, Len; Oldenburg, Douglas W.; Dam, Remke L. Van; Billings, Stephen

doi:10.1190/1.3059142

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Specifically, homogenous halfspace models with frequencydependent complex magnetic susceptibility have been developed to determine the effect of magnetic soils on metal detectors [23][24] . A generalized magnetic susceptibility model is described below (1), where the susceptibility is modeled as a complex quantity, χ' and χ'' are the real and imaginary parts of susceptibility, χ 0 is d.c. susceptibility, τ1 and τ2 are the limits of relaxation times of soil magnetic grains.…”

Section: Modelingmentioning

confidence: 99%

A synthesis of current knowledge and future directions for soil magnetism research

2009

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Magnetic properties of soils have adverse effects on metal detectors, particularly hampering operations during clearance of landmines and unexploded ordnance. Although there is well established research in soil magnetism and modeling electromagnetic induction systems these have tended to exist in disparate disciplines. Hence, a workshop was organized to bring together researchers, academics, stakeholders and manufacturers to discuss key priorities for research and technology in a unique multidisciplinary environment. Key knowledge gaps identified include limited information on the spatial heterogeneity of soil magnetic properties in 2D and 3D, whether current models describing soil responses are appropriate for all soils and the need for compensation mechanisms in detectors to be improved. Several priorities were identified that would maximize future developments for multidisciplinary research in soil magnetism and detector technology. These include acquiring well constrained empirical data on soil electromagnetic properties and detector response over the frequency range of detectors; development of predictive models of soil magnetic properties; investigating variability of soil magnetic properties in two and three dimensions across a range of scales. Improved communication between disciplines is key to effective targeting and realization of research priorities. Possible platforms include a multidisciplinary pilot study at an appropriate site and the development of an online repository to assist dissemination of results and information.

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Section: Modelingmentioning

confidence: 99%

A synthesis of current knowledge and future directions for soil magnetism research

2009

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Modelling the superparamagnetic response of AEM data

Sattel

Mutton

2015

Exploration Geophysics

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Magnetic susceptibility measurement and heavy metal pollution at an automobile station in Ilorin, North-Central Nigeria

Orosun

Oniku

Peter

et al. 2020

Environ. Res. Commun.

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Magnetic susceptibility measurement was carried out on 26 top-soil samples randomly collected from the study area and 5 selected top-soil samples outside the station, using the Bartington MS meter linked to a computer operated using Multisus2 software. The Measurements was done at both low (0.47 kHz) and high (4.7 kHz) frequency susceptibilities which was further used to calculate the frequency dependent susceptibility (Χ FD ). The values for low frequency mass magnetic susceptibility ranges between 96.6×10 −5 m 3 kg −1 and 146×10 −5 m 3 kg −1 with an average value of 117.35×10 −5 m 3 kg −1 and standard deviation of 12.22×10 −5 m 3 kg −1 . The result reveal high magnetic susceptibility values at the station compared with the values observed outside the station which ranges between 53.0×10 −5 m 3 kg −1 and 72.3×10 −5 m 3 kg −1 with an average value of 63.2×10 −5 m 3 kg −1 and standard deviation of 7.01×10 −5 m 3 kg −1 . This significant magnetic enhancement indicates high concentration of ferrimagnetic minerals in the soil and thus evidence of pollution due to the activities at the station which implies that the magnetic enhancement is of anthropogenic source than pedogenic and lithogenic. Analysis of the heavy metals also reveals higher values at the station. The correlation analysis between the mass specific magnetic susceptibility and the heavy metals concentrations (i.e. Cu (R=0.92), Fe (R=0.88), Cr (R=0.85), Zn (R=0.83), Cd (R=0.79), Mg (R=0.72), Mn (R=0.60), Pb (R=0.67)) which was conducted to further investigate the relationship between the soil magnetic susceptibility values and elemental variations, demonstrated magnetic susceptibility can be used as a proxy method for assessing the pollution of these heavy metals.There is no funding received for this research work. ORCID iDsMuyiwa Michael Orosun https://orcid.org/0000-0002-0236-3345 Naheem Banji Salawu https:/ /orcid.org/0000-0001-5089-2359 Louis Hitler https://orcid.org/0000-0002-0286-2865 ReferencesAyoubi S and Adman V 2019 Iron mineralogy and magnetic susceptibility of soils developed on various rocks in western Iran Clay and Clay Minerals. 67 217-27 Ayoubi S and Karami M 2019 Pedotransfer functions for predicting heavy metals in natural soils using magnetic measures and soil properties J. Geochem. Explor. 197 212-9 Beget J E, Stone D B and Hawkins D B 1990 Paleoclimatic forcing of magnetic susceptibility variation in alaskan loess during the late quaternary Geology 18 40-3 Blundell A, Dearing J A, Boyle J F and Hannam J A 2009 Controlling factors for the spatial variability of soil magnetic susceptibility across England and Wales Earth Sci. Rev. 95 158-88 Brempong F, Mariam Q and Preko K 2016 The use of magnetic susceptibility measurements to determine pollution of agricultural soils in road proximity Afr. J. Environ. Sci. Technol. 10 263-71 Caggiano R, Coppola R, Di Leo S, Macchiato M and Ragosta M 2005 Comparison between in situ soil magnetic susceptibility measurements and heavy metal concentrations: the case of the...

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Characterization of frequency‐dependent magnetic susceptibility in UXO electromagnetic geophysics

Cited by 4 publications

References 7 publications

A synthesis of current knowledge and future directions for soil magnetism research

A synthesis of current knowledge and future directions for soil magnetism research

Modelling the superparamagnetic response of AEM data

Magnetic susceptibility measurement and heavy metal pollution at an automobile station in Ilorin, North-Central Nigeria

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