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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2020

Confidentiality

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

Name of the periodical

Environmental Science &amp; Technology

ISSN

0013-936X

e-ISSN

—

Volume of the periodical

54

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

1545-1553

UT code for WoS article

000511508500028

EID of the result in the Scopus database

2-s2.0-85079023036