Magnetic monitoring of top soils of Merida (Southern Mexico) |
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| Authors: | Bertha Aguilar Reyes Francisco Bautista Avto Goguitchaichvili Ofelia Morton |
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| Institution: | 1.Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica - Sede Michoacán,Universidad Nacional Autónoma de México,Morelia,Mexico;2.Laboratorio de Suelos y Agua, Centro de Investigaciones en Geografía Ambiental,Universidad Nacional Autónoma de México,Morelia,Mexico;3.Laboratorio de Paleomagnetismo, Instituto de Geofísica,Universidad Nacional Autónoma de México,México D.F.,Mexico |
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| Abstract: | This paper focuses on the study of the correlation between magnetic parameters with the level of contamination by heavy metals
in urban soils. We report a magnetic investigation of urban soil samples from Merida, state of Yucatan, Southern Mexico. It
appears that most of our samples contain ferrimagnetic minerals as the magnetic carriers, probably coming from the titanomagnetites/titanomaghemites
series. This is inferred by the acquisition of isothermal remanent magnetization, which shows that most of samples are almost
completely saturated at about 200 mT. The S−200 value (factor characterizing stability of remanent magnetization) is between 0.8 and 1.0, characteristic of ferrimagnetic
minerals. The susceptibility vs. temperature measurements also point to some titanomaghemites and titanomagnetites as probable
responsible for magnetization. On the other hand, measurements of magnetic susceptibility at high and low frequencies helped
us to determine the high content of superparamagnetic grains in the majority of the samples, although not all of these showed
high values of magnetic susceptibility. We found that the most contaminated samples by Pb and Zn showed the higher saturation
isothermal remanent magnetization values, whereas the higher values in magnetic susceptibility correspond to samples contaminated
by Cr. Finally, we noted that a high level in Sr decreases the magnetic susceptibility. |
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