Realgar (As4S4) bioprecipitation in microcosm fed by a natural groundwater and organic matter

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10397621" target="_blank" >RIV/00216208:11310/19:10397621 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=MqoTfRJsS" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=MqoTfRJsS</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11356-019-05237-4" target="_blank" >10.1007/s11356-019-05237-4</a>

Result language

angličtina

Original language name

Realgar (As4S4) bioprecipitation in microcosm fed by a natural groundwater and organic matter

Original language description

Sequestration of arsenic to biogenic sulfide minerals is known from As-contaminated anoxic environments. Despite numerous successful laboratory experiments, the process remains difficult to predict in moderate arsenic conditions. We performed microcosm experiments using naturally contaminated groundwater (containing ca. 6mg/L As) and natural organic matter (NOM) particles both collected from wetland soil. Macroscopic realgar precipitates, occasionally accompanied by bonazziite, a FeS phase, elementary S, calcite, and whewellite, appeared after 4 to 18months. Realgar only precipitated in microcosms moderately poisoned by azide or antibiotics and those in which oxidation of hydrogen sulfide to sulfur took place. The biomineralization process was not affected by the presence of additional carbon sources or the diversity, community structure, and functional composition of the microbial community. Hydrogen sulfide concentration was greater in the realgar-free microcosms, suggesting that arsenic thiolation prevented precipitation of realgar. We compared our data to available microbial community data from soils with different rates of realgar precipitation, and found that the communities from realgar-encrusted NOM particles usually showed limited sulfate reduction and the presence of fermentative metabolisms, whereas communities from realgar-free NOM particles were strongly dominated by sulfate reducers. We argue that the limited sulfate supply and intensive fermentation amplify reducing conditions, which make arsenic sulfide precipitation plausible in high-sulfate, low-arsenic groundwaters.

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

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA16-09352S" target="_blank" >GA16-09352S: Towards a better understanding of environmental As mineralogy under reducing conditions:Formation of realgar and evaluation of its role in remediation</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Environmental Science and Pollution Research

ISSN

0944-1344

e-ISSN

—

Volume of the periodical

26

Issue of the periodical within the volume

18

Country of publishing house

DE - GERMANY

Number of pages

11

Pages from-to

18766-18776

UT code for WoS article

000471725900077

EID of the result in the Scopus database

2-s2.0-85066906454