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2020-12-14

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cc-by (c) Butturini, Andrea et al., 2020
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/174617

Dissolved organic matter in continental hydro-geothermal systems: insights from two hot springs of the East African Rift valley

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https://doi.org/10.3390/w12123512

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Little is known about the quantity and quality of dissolved organic matter (DOM) in waters from continental geothermal systems, with only a few reports available from the Yellowstone US National Park. In this study, we explored the chemodiversity of DOM in water samples collected from two geothermal hot springs from the Kenyan East African Rift Valley, a region extremely rich in fumaroles, geysers, and spouting springs, located in close proximity to volcanic lakes. The DOM characterization included in-depth assessments performed by negative electrospray ionization Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Reduced, saturated and little aromatic DOM compounds were dominant in the hot spring waters collected from either the Ol Njorowa gorge (ON) or the south shore of the soda-saline Lake Elementaita (ELM). Oxygen-poor and sulfur-bearing DOM molecules prevailed in ON, probably reflecting abiotic sulfurization from sulfide-rich geofluids. Nitrogen-bearing aliphatic and protein-like molecules were abundant in ELM, possibly perfusing through the organic-rich sediments of the adjacent Lake Elementaita. Notably, the heat-altered DOM of ancient autochthonous derivation could represent an overlooked source of aliphatic organic carbon for connected lentic environments, with a potential direct impact on nutrient cycling in lakes that receive geothermal water inputs.

Matèries

Compostos orgànics, Kenya, Ecologia dels llacs

Matèries (anglès)

Organic compounds, Kenya, Lake ecology

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Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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BUTTURINI, Andrea, AMALFITANO, Stefano, HERZSPRUNG, Peter, LECHTENFELD, Oliver j., VENTURI, Stefania, OLAKA, Lydia a., PACINI, Nic, HARPER, David m., TASSI, Franco, FAZI, Stefano. Dissolved organic matter in continental hydro-geothermal systems: insights from two hot springs of the East African Rift valley. _Water_. 2020. Vol. 12(12), núm. 3512. [consulta: 21 de gener de 2026]. ISSN: 2073-4441. [Disponible a: https://hdl.handle.net/2445/174617]

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