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' 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' 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' 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' 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 & 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