Metal geochemistry in suspended and bed sediments in the eutrophic lowland Salado River basin (Buenos Aires, Argentina)
| Autor: | Santiago Heguilor, C. N. Skorupka, Juan Carlos Colombo, Leandro Martín Tatone, Eric Demian Speranza |
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| Rok vydání: | 2021 |
| Předmět: |
Pollution
media_common.quotation_subject 0208 environmental biotechnology Geochemistry Drainage basin Soil Science 02 engineering and technology 010501 environmental sciences 01 natural sciences purl.org/becyt/ford/1 [https] purl.org/becyt/ford/1.5 [https] Salado River River mouth Ciencias Naturales Environmental Chemistry 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology media_common Total organic carbon Global and Planetary Change geography geography.geographical_feature_category Sediment Geology Estuary Suspended particulate matter 020801 environmental engineering Metals Bed sediments Environmental science Water quality Eutrophication |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1866-6299 1866-6280 |
| DOI: | 10.1007/s12665-021-09624-4 |
| Popis: | 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 Facultad de Ciencias Naturales y Museo Comisión de Investigaciones Científicas de la provincia de Buenos Aires |
| Databáze: | OpenAIRE |
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