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Frequency dependence of magnetic susceptibility of weakly contaminated soil sediments
Abstract
This paper reports the frequency dependence of magnetic susceptibility of weakly contaminated soil sediments. Low field magnetic susceptibility measurements were carried
out on soil sediments at Bomo irrigation dam, Samaru College of Agriculture, Ahmadu Bello University, (ABU), Zaria, using the MS2D field loop. Soil samples were also collected for laboratory analyses. The volumetric percentage composition of magnetite (Fe) in the
soil was found to be about 0.02%. Frequency dependent magnetic susceptibility measured at two frequencies (0.465 kHz and 4.65 kHz) using MS2B sensor reveals a slight difference between magnetic susceptibility values with the higher frequency indicating lower values.
The coefficient of frequency dependence (%) values varying between 2.37% and 7.39%, indicating the presence of a mixture of ultrafine superparamagnetic and coarse nonsuperparamagnetic grains or SP grains < 0.005 m ferromagnetic minerals occurring as crystals in the top soil. The soil formation process was as a result of secondary ferromagnetic minerals occurring as a result of burning, biochemical and authigenic processes in the area under investigation.
out on soil sediments at Bomo irrigation dam, Samaru College of Agriculture, Ahmadu Bello University, (ABU), Zaria, using the MS2D field loop. Soil samples were also collected for laboratory analyses. The volumetric percentage composition of magnetite (Fe) in the
soil was found to be about 0.02%. Frequency dependent magnetic susceptibility measured at two frequencies (0.465 kHz and 4.65 kHz) using MS2B sensor reveals a slight difference between magnetic susceptibility values with the higher frequency indicating lower values.
The coefficient of frequency dependence (%) values varying between 2.37% and 7.39%, indicating the presence of a mixture of ultrafine superparamagnetic and coarse nonsuperparamagnetic grains or SP grains < 0.005 m ferromagnetic minerals occurring as crystals in the top soil. The soil formation process was as a result of secondary ferromagnetic minerals occurring as a result of burning, biochemical and authigenic processes in the area under investigation.
