Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)

The Salado River is a lowland river that drains a vast and productive region of central Argentina into the Rio de la Plata estuary. To evaluate water quality and the geochemistry of major and trace metals (Fe, Mn, Zn, Cu, Pb, Cr and Ni), water and sediments samples were collected along 500 km of the...

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Detalles Bibliográficos
Autores principales: Tatone, Leandro Martín, Heguilor, Santiago, Speranza, Eric Demian, Skorupka, Carlos Norberto, Colombo, Juan Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Ciencias Naturales
Metals
Suspended particulate matter
Bed sediments
Salado River
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/138744
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-138744
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Metals
Suspended particulate matter
Bed sediments
Salado River
spellingShingle Ciencias Naturales
Metals
Suspended particulate matter
Bed sediments
Salado River
Tatone, Leandro Martín
Heguilor, Santiago
Speranza, Eric Demian
Skorupka, Carlos Norberto
Colombo, Juan Carlos
Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
topic_facet Ciencias Naturales
Metals
Suspended particulate matter
Bed sediments
Salado River
description The Salado River is a lowland river that drains a vast and productive region of central Argentina into the Rio de la Plata estuary. To evaluate water quality and the geochemistry of major and trace metals (Fe, Mn, Zn, Cu, Pb, Cr and Ni), water and sediments samples were collected along 500 km of the Salado River basin (n = 21). Waters were highly alkaline (pH: 8.8 ± 0.4), saline (5.2 ± 1.8 mS/cm), turbid (467 ± 237 NTU) and eutrophic (chlorophyll a: 187 ± 119 µg/l) with a decreasing gradient towards the river mouth reflecting the contribution of alkaline ground waters and eutrophication at the river head. Suspended particles (70–595 mg/l) were enriched in total organic carbon, nitrogen (5–7 times) and metals (1–4 times) relative to bed sediments, but metal concentrations were 2–10 times below the world river’s average. Consistently, metal concentrations in bed sediments were lower than sediment quality guidelines with an increasing downriver trend following the enrichment of clays. The enrichment factors (EF) and geoaccumulation index (Igeo), calculated with local background metal levels from the deepest layers of a dated sediment core, indicate a general prevalence of natural metal sources (EF < 1.5) with unpolluted sediments (Igeo ≤ 0), excepted for the Chivilcoy stream, which showed a significant enrichment of Zn, Cu and Pb (EF = 2–12; 0 ≤ Igeo ≤ 1) constituting a clear pollution hot spot in the basin.
format Articulo
Articulo
author Tatone, Leandro Martín
Heguilor, Santiago
Speranza, Eric Demian
Skorupka, Carlos Norberto
Colombo, Juan Carlos
author_facet Tatone, Leandro Martín
Heguilor, Santiago
Speranza, Eric Demian
Skorupka, Carlos Norberto
Colombo, Juan Carlos
author_sort Tatone, Leandro Martín
title Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
title_short Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
title_full Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
title_fullStr Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
title_full_unstemmed Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
title_sort metal geochemistry in suspended and bed sediments in the eutrophic lowland salado river basin (buenos aires, argentina)
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/138744
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