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Solar Radiation as the Likely Cause of Acid-Soluble Rare-Earth Elements in Sediments of Fresh Water Humic Lakes

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F20%3A43902004" target="_blank" >RIV/60076658:12310/20:43902004 - isvavai.cz</a>

  • Výsledek na webu

    <a href="https://pubs.acs.org/doi/10.1021/acs.est.9b05146" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.est.9b05146</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1021/acs.est.9b05146" target="_blank" >10.1021/acs.est.9b05146</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Solar Radiation as the Likely Cause of Acid-Soluble Rare-Earth Elements in Sediments of Fresh Water Humic Lakes

  • Popis výsledku v původním jazyce

    We studied photochemically induced precipitation of rare-earth elements (REEs) in water from a tributary to Plegne Lake and a tributary to Jiricka Pond, Czech Republic. Both tributaries had high concentrations of dissolved organic matter (similar to 1.8 mmol C L-1). Filtered (0.2 mu m) samples were exposed to artificial solar radiation of 350 W m(-2) for 48 to 96 h, corresponding to 3 to 6 days of natural solar radiation in summer at the sampling locations. Experiments were performed with altered and unaltered pH ranging from 3.8 to 6.0. The formation of particulate REEs occurred in all exposed samples with the fastest formation observed at the original pH. The formation of particulate metals continued in irradiated samples after the end of irradiation, suggesting that photochemically induced reactions and/or continuing precipitation continue in darkness or in deeper water due to mixing. Results were compared with paleolimnological records in the Plesne Lake sediment. At pH 5.0, the photochemically induced sediment flux was 3509 nmol m(-2) y(-1) for Ce, corresponding to 42% of the REEs&apos; annual sediment flux in recent sediment layers. Combining the formation rates obtained in the laboratory irradiation experiments and known 1 day incident solar radiation enabled the estimation of a possible REE sediment flux. For Plesne Lake, the photochemically induced formation of particulate REEs explained 10-44% of the REE concentrations in the upper sediment layers. Observed photochemically induced sequestration of REEs into sediments can explain a significant part of the REEs&apos; history in the Holocene sediment.

  • Název v anglickém jazyce

    Solar Radiation as the Likely Cause of Acid-Soluble Rare-Earth Elements in Sediments of Fresh Water Humic Lakes

  • Popis výsledku anglicky

    We studied photochemically induced precipitation of rare-earth elements (REEs) in water from a tributary to Plegne Lake and a tributary to Jiricka Pond, Czech Republic. Both tributaries had high concentrations of dissolved organic matter (similar to 1.8 mmol C L-1). Filtered (0.2 mu m) samples were exposed to artificial solar radiation of 350 W m(-2) for 48 to 96 h, corresponding to 3 to 6 days of natural solar radiation in summer at the sampling locations. Experiments were performed with altered and unaltered pH ranging from 3.8 to 6.0. The formation of particulate REEs occurred in all exposed samples with the fastest formation observed at the original pH. The formation of particulate metals continued in irradiated samples after the end of irradiation, suggesting that photochemically induced reactions and/or continuing precipitation continue in darkness or in deeper water due to mixing. Results were compared with paleolimnological records in the Plesne Lake sediment. At pH 5.0, the photochemically induced sediment flux was 3509 nmol m(-2) y(-1) for Ce, corresponding to 42% of the REEs&apos; annual sediment flux in recent sediment layers. Combining the formation rates obtained in the laboratory irradiation experiments and known 1 day incident solar radiation enabled the estimation of a possible REE sediment flux. For Plesne Lake, the photochemically induced formation of particulate REEs explained 10-44% of the REE concentrations in the upper sediment layers. Observed photochemically induced sequestration of REEs into sediments can explain a significant part of the REEs&apos; history in the Holocene sediment.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10511 - Environmental sciences (social aspects to be 5.7)

Návaznosti výsledku

  • Projekt

    Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

  • Návaznosti

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Ostatní

  • Rok uplatnění

    2020

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    Environmental Science &amp; Technology

  • ISSN

    0013-936X

  • e-ISSN

  • Svazek periodika

    54

  • Číslo periodika v rámci svazku

    3

  • Stát vydavatele periodika

    US - Spojené státy americké

  • Počet stran výsledku

    9

  • Strana od-do

    1545-1553

  • Kód UT WoS článku

    000511508500028

  • EID výsledku v databázi Scopus

    2-s2.0-85079023036