Concentrations of available heavy metals in Mediterranean agricultural soils and their relation with some soil selected properties: a case study in typical Mediterranean soils

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Concentrations of available heavy metals in Mediterranean agricultural soils and their relation with some soil selected properties: a case study in typical Mediterranean soils

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Title: Concentrations of available heavy metals in Mediterranean agricultural soils and their relation with some soil selected properties: a case study in typical Mediterranean soils
Author: Nunes, José Manuel Rato; Ramos Miras, José Joaquín; López Piñeiro, Antonio; Loures, Luís; Gil de Carrasco, Carlos; Coelho, José; Lores, Ana
Abstract: La caracterización del contenido de metales traza en los suelos es un instrumento en muchos programas de protección del medio ambiente, incluido el establecimiento de normas a nivel regional para detectar los sitios afectados por la contaminación. Los objetivos del presente estudio son el estudio de los niveles disponibles de Cd, Cr, Cu, Ni, Pb y Zn en los horizontes superficiales de los suelos agrícolas en una región mediterránea europea típica, para establecer la concentración de línea de base geoquímica (GBC), nivel de fondo (BL), y el valor de referencia (RV) de cada uno de estos metales disponibles, y para investigar sus posibles correlaciones con las propiedades del suelo. Para establecer los valores del GBC y RV, se utilizó el "método del umbral estándar", y se obtuvieron muestras del suelo superficial (0-20 cm) de 630 sitios, y se extrajeron con ácido dietilene triamino pentacético (DTPA) para determinar sus concentraciones de metales pesados disponibles. Los valores GBC establecidos fueron: 0,04-0,90 mg kg-1, 0,70 a 2,50 mg kg-1, 0,10 a 6,30 mg kg-1, 0,30 a 7,90 mg kg-1, 0,29 a 4,50 mg kg-1, y 0,18 a 2,50 mg kg-1 de Cd, Cr, Cu, Ni, Pb y Zn, respectivamente. Se ha encontrado que las propiedades del suelo se correlacionan con el contenido de metales pesados disponibles, lo que sugiere que la mayor movilidad de los metales pesados está en relación con las actividades del hombre.The characterization of the content of trace metals in soils is an instrument in many programs of environmental protection, including the establishment of regional-level standards to detect sites affected by contamination. The objectives of the present study were to study the available levels of Cd, Cr, Cu, Ni, Pb, and Zn in surface horizons of agricultural soils in a typical European Mediterranean region, to establish the geochemical baseline concentration (GBC), background level (BL), and reference value (RV) of each of these available metals, and to investigate their possible correlations with soil properties. To establish the GBC and RV values, we used the “standard threshold method”. Topsoil samples (0–20 cm) were collected from 630 sites, and extracted with Diethylene Triamine Pentaacetic Acid (DTPA) to determine their available heavy metal concentrations. The GBC values established were: 0.04 to 0.90 mg kg−1, 0.70 to 2.50 mg kg−1, 0.10 to 6.30 mg kg−1, 0.30 to 7.90 mg kg−1, 0.29 to 4.50 mg kg−1, and 0.18 to 2.50 mg kg−1 for Cd, Cr, Cu, Ni, Pb, and Zn, respectively. Soil properties were found to be correlated with the available heavy metal content, suggesting that the enhanced mobility of heavy metals are related to anthropic activities.
URI: http://hdl.handle.net/10662/4350
Date: 2014-12


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