Chemical character and structure of uraniferous bitumens (Vrchlabí, Czech Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F22%3A00566957" target="_blank" >RIV/67985891:_____/22:00566957 - isvavai.cz</a>

Alternative codes found

RIV/61389005:_____/22:00565001

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0166516222002130?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0166516222002130?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.coal.2022.104137" target="_blank" >10.1016/j.coal.2022.104137</a>

Result language

angličtina

Original language name

Chemical character and structure of uraniferous bitumens (Vrchlabí, Czech Republic)

Original language description

Black shales from the Permian rocks at Vrchlabí in the Krkonoše Piedmont Basin (Czech Republic) contain bitumens with uraninite grain inclusions and bulk uranium concentrations up to 4.8 wt%, determined by instrumental neutron activation analysis. The carbonaceous matter in the bitumens has been characterised by gas chromatography/mass spectrometry, attenuated total reflection Fourier transform infrared spectroscopy, scanning electron microscopy, and stable carbon isotopic composition. Progressive radiolytic alteration was documented by changes in the chemical composition and structure of both bulk samples and on the microscale. Condensation of aromatic structures, increase in content of oxygenated compounds, and enrichment in 13C were documented in the uranium-rich bulk samples. Micro-ATR-FTIR area mapping throughout the bright halos around uraninite inclusions revealed detailed structural changes, particularly a decrease in aliphatic bond intensities and an increase in the aromaticity of the structures close to the inclusions. A radiolytic alteration pathway has been suggested assuming a complex of reactions between organic matter and uranyl containing hydrothermal solutions, and oxidation by OH radicals produced in radiolysis of water. The organic matter transformations observed in the uraniferous bitumen correspond to the coalification processes, changing the bitumen composition from type I to type III and IV kerogens. Detailed characterisation of the radiation-induced chemical and structural changes in the naturally occurring uraniferous bitumens will contribute to the general understanding of the nature and behaviour of organic matter in other uraniferous environments or in the radioactive waste repositories.

Czech name

—

Czech description

—

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/GA19-05360S" target="_blank" >GA19-05360S: Radiolytic alteration of organic matter in uraniferous environment</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

International Journal of Coal Geology

ISSN

0166-5162

e-ISSN

1872-7840

Volume of the periodical

264

Issue of the periodical within the volume

DEC 1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

104137

UT code for WoS article

000883101200001

EID of the result in the Scopus database

2-s2.0-85141226100