Solar radiation as the likely cause of acid-soluble rare-earth elements in sediments of fresh water humic lakes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F20%3A00539295" target="_blank" >RIV/60077344:_____/20:00539295 - isvavai.cz</a>

Výsledek na webu

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

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

ENVIRONMENTAL SCIENCE & TECHNOLOGY

ISSN

1520-5851

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