Studies of Magnetic Susceptibility in soils affected by mining contamination of S. Pedro da Cova [Estudo da suscetibilidade magnética em solos contaminados pela extração mineira de São Pedro da Cova]

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Santos, PC (Author) Other; Sant'Ovaia, H (Author) FCUP; Espinha Marques, J (Author) FCUP

Journal

Title: Comunicações Geológicas

Vol. 101

Pages: 1067-1071

ISSN: 0873-948X

Publisher: LNEG - Laboratório Nacional de Energia e Geologia

Indexing

Scopus - 1 Citation

Scientific classification

FOS: Natural sciences > Earth and related Environmental sciences

CORDIS: Natural sciences

Other information

Authenticus ID: P-00G-K71

Abstract (EN): The objective of this work was to determine criteria of identifying contaminated soils related with mining activity from São Pedro da Cova, Gondomar (north of Portugal). There were considered 21 samples, from contaminated soil and uncontaminated soil, taking into account the type of soil and distance to the contaminant source. The samples were collected in July 2012 and January 2013, upstream and downstream of the three galleries of the mine. The magnetic susceptibility (MS), pH and Electric Conductivity (EC) were measured in all the samples. The MS ranged between 38.63x10-8 m3 kg-1 (A6) and 4057.24 x10-8 m3 kg-1 (A7), near gallery 3 without active drainage. Forest soils located outside the influence of mining effluents (A2, S2, A4, A5, A8, M1 and T2) obtained intermediate values of MS and low pH and EC. Forest soils located along the drainage channels currently with drainage (A1, A6 and S6), present low values of MS and high values of pH and EC. Generally, agricultural soils had higher values of MS due to the homogenization of soil and irrigation with water from mining effluents. The soils of mining landfills obtained similar values of MS, pH and EC. The A8 sample had a high value of MS that may result from the occurrence of forest fires in recent years. The T2 sample had a high value of MS that may be due to the influence of road traffic. There were no negative MS values, indicating the absence of diamagnetic particles. The soils exhibit ferromagnetic and paramagnetic particles. The techniques of environmental magnetism proved to be an important assessment tool in soils when combining with pH and EC measurements. © 2014, LNEG ¿ Laboratório Nacional de Geologia e Energia IP.

Language: Portuguese

Type (Professor's evaluation): Scientific