Publicado

2023-05-25

Spatial variability and ecological risk assessment of heavy metals in surface sediments of the Unete River in the department of Casanare (Colombia)

Evaluación de la variabilidad espacial y riesgo ecológico de metales pesados en sedimentos superficiales del río Unete en el departamento de Casanare (Colombia)

DOI:

https://doi.org/10.15446/dyna.v90n226.107126

Palabras clave:

heavy metals; sediments; environmental risk (en)
metales pesados; sedimentos; riesgo ambiental (es)

Autores/as

  • Karen Baños-Niño Facultad Seccional Sogamoso, Escuela de Ingeniería Geológica, Grupo de investigación CITESA, Universidad Pedagógica y Tecnológica de Colombia, Sogamoso, Boyacá-Colombia https://orcid.org/0009-0001-3359-7603
  • José Alfredo Camargo-Martínez Grupo de Investigación CIBAIN, Universidad Internacional del Trópico Americano - Unitrópico, Yopal, Colombia https://orcid.org/0000-0003-0230-6516
  • Mercedes Díaz-Lagos Facultad Seccional Sogamoso, Escuela de Ingeniería Geológica, Grupo de investigación CITESA, Universidad Pedagógica y Tecnológica de Colombia, Sogamoso, Boyacá-Colombia https://orcid.org/0000-0003-2634-7654

Surface sediment samples obtained from 46 sites of the Unete River in Casanare (Colombia) were analyzed to evaluate the concentrations of the heavy metals As, Cu, Ni, Pb and Zn as well as to determine their geographic spatial distribution and potential ecological risk. The measured concentrations were compared with the background values (BV), threshold effect concentration (TEC) and probable effect concentration (PEC) from consensus-based Sediment quality criteria guidelines (SQGs) for heavy metals in freshwater ecosystems in order to determine the level of concern of the contaminant concentrations. Based on these results and on the indices of determined potential ecological risk, As and Pb were shown to be the heavy metal contaminants of most concern in surface sediments. The possible sources causing the concerning concentrations were then discussed.

Se analizaron muestras de sedimentos superficiales obtenidas de 46 puntos del río Unete en Casanare (Colombia) para evaluar las concentraciones de los metales pesados As, Cu, Ni, Pb y Zn, y determinar su distribución espacial y el riesgo ecológico potencial. Las concentraciones medidas se compararon con los valores de fondo, la concentración de efecto umbral (CEU) y la concentración de efecto probable (CEP) definidos en las directrices de criterios de calidad de sedimentos (DCS) para metales pesados ​​en ecosistemas de agua dulce, para indicar el nivel de preocupación de las concentraciones de contaminantes. Con base en estos resultados y los índices de riesgo ecológico potencial determinados, el As y el Pb fueron los metales pesados contaminantes presentes de ​​mayor preocupación en los sedimentos superficiales. Finalmente, se sugirieron las posibles fuentes causantes de las concentraciones preocupantes.

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[1]
“Evaluación de la variabilidad espacial y riesgo ecológico de metales pesados en sedimentos superficiales del río Unete en el departamento de Casanare (Colombia)”, DYNA, vol. 90, no. 226, pp. 44–49, May 2023, doi: 10.15446/dyna.v90n226.107126.