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14. LABORATORY INVESTIGATION OF MAGNETIC SUSCEPTIBILITY OF HYDROCARBON CONTAMINATED SOIL. by Meludu O.C, Ahile J. A, Hiar N, Drambi J. S. andNyagba B. B Volume 55 (February 2020 Issue)
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LABORATORY INVESTIGATION OF MAGNETIC SUSCEPTIBILITY OF HYDROCARBON CONTAMINATED SOIL.

Meludu O.C1., Ahile J. A1*., Hiar N1., Drambi J. S1. andNyagba B. B2

Department of Physics, Modibbo Adama University of Technology, P.M.B. 2076, Yola, Adamawa State, Nigeria.

Department of Basic Science, College of Agriculture, P.M.B 2015, Jalingo, Taraba state, Nigeria.

Abstract

Magnetic susceptibility (MS) monitoring of hydrocarbon contaminated soils and non-contaminated soils was carried out using Bartington MS2 magnetic susceptibility system with the aim of determining the suitability of magnetic susceptibility as a proxy for hydrocarbon pollution detection. Magnetic parameters viz. (MS & FD%) of both HC contaminated and non-contaminated soil sample were determined. The correlation coefficient between MS and its controlling factor such as duration and concentration of HC pollutant were investigated. Five samples of Sandy, Clay and sandy-loam each were collected at five different places at the depth of 5 cm each using soil auger. Each sample was subdivided into five (5) samples which amount to the total of seventy-five (75) samples all together and 25 samples per soil textual class. Three (3) representative samples of each soil textural class totaling 15 samples were used as control while the remaining 60 samples were subjected to varying (0.5 ml, 1 ml, 1.5 ml & 2 ml)degree of contamination of crude oil. The MS of all the contaminated and non-contaminated samples were measured at both low and high frequencies once every week over period of one month. The result of low frequency MS of the uncontaminated sandy, clay and sandy-loam ranged from 1.8-18.75 x 10-6m3kg-1, 7.85-61.75 x 10-6m3kg-1 and 5.625-11.15 x 10-6m3kg-1respectively while the result of low frequency MS of the contaminated sandy, clay and sandy-loam ranged from 1.2-18.2 x 10-6m3kg-1, 6.575-65.35 x 10-6m3kg-1and 4.95-10.55 x 10-6m3kg-1 with their mean value of 8.185 x 10-6m3kg-1, 18.2313 x 10-6m3kg-1 and 7.4738 x 10-6m3kg-1 respectively. The correlation of LF and HF magnetic susceptibility with degree of contamination of HC showed that 100% of sandy-loam sample showed strong correlation coefficient (R2) value above 0.95 while only 40% of sandy and 60% of clay showed strong correlation coefficient value above 0.60 when the MS was measured with varying degree of crude oil contamination. 80% of sandy and clay showed good correlation coefficient when the MS was measured over the time while only 40% of sandy-loam showed good correlation coefficient which entails period of contaminant deposition could also affect the value of soil magnetic susceptibility. Therefore, magnetic methods may provide a quick and cost-effective way to assess HC contamination in soils.

Keywords: Hydrocarbon, Soil Pollution, Magnetic Susceptibility, Frequency Dependent Susceptibility (FD%).

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