Arsenic and selenium levels in rice fields from south-west of Spain: influence of the years of monoculture

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Arsenic and selenium levels in rice fields from south-west of Spain: influence of the years of monoculture

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Title: Arsenic and selenium levels in rice fields from south-west of Spain: influence of the years of monoculture
Author: Morales Rodrigo, Sara; Santamaría Becerril, Oscar; Pérez Izquierdo, Leticia; Poblaciones Suárez-Bárcenas, María José
Abstract: Existe una falta de información sobre las concentraciones de arsénico (As) y selenio (Se) en los campos de arroz español (Oryza sativa L.) y cómo las condiciones del suelo afectan dicha concentración, especialmente las derivadas del monocultivo típico practicado en el área estudiada. Para aclarar estos aspectos, se recolectaron 76 muestras de suelo y 95 muestras de grano de 19 campos de arroz a lo largo del área de Vegas Altas, la zona de cultivo de arroz más importante del suroeste de España. Los resultados sugirieron un aumento significativo en las concentraciones totales de As y Se del suelo a medida que aumentaba el número de monocultivos. Mientras que la concentración alcanzó niveles tóxicos en 12 de las 19 ubicaciones, la concentración de Se en todos los campos analizados podría considerarse deficiente. Un aumento de la concentración de As y Se en el suelo produjo un aumento posterior de la concentración de ambos elementos en el grano de arroz. Por lo tanto, podría ser extremadamente importante controlar ambos niveles. Sería necesario establecer diferentes acciones, incluyendo rotaciones con otros cultivos, para remediar la acumulación de As e incrementar el consumo de Se.There is a lack of information regarding the arsenic (As) and selenium (Se) concentrations in Spanish rice (Oryza sativa L.) fields and how soil conditions affect such concentration, especially those derived from the typical monoculture practiced in the studied area. To clarify these aspects, 76 soil samples and 95 grain samples were collected from 19 rice fields along the Vegas Altas area, the most important rice growing area of south-west of Spain. The results suggested a significant increase in the soil total As and Se concentrations as the number of monoculture years increased. While As concentration reached toxic levels in 12 out of the 19 locations, Se concentration in all the analysed fields could be considered as deficient. An increase of the As and Se concentration in soil produced a subsequent increase of the concentration of both elements in the rice grain. Therefore, it might be extremely important to control both levels. It would be necessary to establish different actions, including rotations with other crops, in order to remediate As accumulation and to increase Se intake.
URI: http://hdl.handle.net/10662/8793
Date: 2017


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