Magnetic susceptibility measurements as proxy method to monitor soil pollution: development of experimental protocols for field surveys |
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Authors: | Mariagrazia D’Emilio Domenico Chianese Rosa Coppola Maria Macchiato Maria Ragosta |
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Institution: | (1) CNISM – Istituto di Metodologie per l’ Analisi Ambientale–-CNR, C. da S. Loja, Tito, 85050, Italy;(2) CNISM – Dipartimento di Scienze Fisiche, Università degli Studi di Napoli “Federico II”, Complesso Universitario Monte S. Angelo, Via Cintia, Napoli, 80126, Italy;(3) Dipartimento di Ingegneria e Fisica dell’Ambiente, Università degli Studi della Basilicata, C. da Macchia Romana, Potenza, 85100, Italy |
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Abstract: | In the framework of the development of new methods for measuring and monitoring soil pollution, this paper deals with the
use of magnetic methodologies to monitor the heavy metals presence in soils. In particular it shows a procedure for collecting
magnetic susceptibility measurements in order to interpret them as proxy variable for monitoring heavy metals in soils. Magnetic
measurements are carried out using a magnetic susceptibility meter with two different probes for in situ field surveys. The
experimental procedure is divided in two parts. In the first part we carry out laboratory tests aimed to evaluate, for both
the probes, the effective investigation depth for soil, the measurement reproducibility under different conditions, and the
influence of water content. We complete this part comparing in situ measurements obtained by means of two probes with different
characteristics. In the second part we carry out tests to evaluate the relationships between heavy metal levels and magnetic
susceptibility values of soil samples. We investigate the variability of the magnetic susceptibility measurements contaminating
different soil samples with well known concentration of heavy metals. Moreover we study the correlation between magnetic susceptibility
values and metal concentrations, determined by means of AAS, in soil samples collected during a field survey. Results suggest
that a careful check of the experimental procedure play a crucial role for using magnetic susceptibility measurements for
heavy metals in situ monitoring. This is very helpful both for improving the quality of data and for making simpler data interpretation. |
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Keywords: | Magnetic susceptibility Soil pollution Heavy metals Experimental protocols |
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