Early Diagenetic Processes in the Sediments of the Krka River Estuary
To study the processes that govern the post-depositional mobility of metals in the estuarine sediment, five sediment cores were sampled in the Krka River estuary (Croatia). The obtained concentration ranges in the pore water were 0.057–49.7 μM for Fe, 0.310–100 μM for Mn, 0.068–26.8 nM for Co, 0.126...
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MDPI AG
2024-03-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/12/3/466 |
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| author | Nuša Cukrov Neven Cukrov Dario Omanović |
| author_facet | Nuša Cukrov Neven Cukrov Dario Omanović |
| author_sort | Nuša Cukrov |
| collection | DOAJ |
| description | To study the processes that govern the post-depositional mobility of metals in the estuarine sediment, five sediment cores were sampled in the Krka River estuary (Croatia). The obtained concentration ranges in the pore water were 0.057–49.7 μM for Fe, 0.310–100 μM for Mn, 0.068–26.8 nM for Co, 0.126–153 nM for Cu, 11.5–2793 nM for Zn, 0.222–31.3 nM for Pb, 4.09–59.4 nM for U, 38.8–2228 nM for Mo, and 0.065–2.29 nM for As. The vertical distribution of metals in the dissolved and solid fraction of the sediment, coupled with other diagenetic tracers (e.g., dissolved sulphide), demonstrate the importance of early diagenetic reactions, in particular Fe and Mn oxyhydroxide and sulphate reduction, for the cycling of metals in the sediment. The redox zonation in the sediment was compressed, and the suboxic zone occurs immediately below the sediment–water interface. The estimated benthic fluxes in the estuary were 5220 kg y<sup>−1</sup> for Fe, 27,100 kg y<sup>−1</sup> for Mn, 6.00 kg y<sup>−1</sup> for Co, 20.5 kg y<sup>−1</sup> for Cu, 5.16 kg y<sup>−1</sup> for Pb, 111 kg y<sup>−1</sup> for Mo, and 87.3 kg y<sup>−1</sup> for As. The riverine input was more important than the benthic flux, except in the case of Mn and Fe. |
| first_indexed | 2024-04-24T18:07:31Z |
| format | Article |
| id | doaj.art-e464d0306ad248cfa655e738641aeac9 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-04-24T18:07:31Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-e464d0306ad248cfa655e738641aeac92024-03-27T13:49:20ZengMDPI AGJournal of Marine Science and Engineering2077-13122024-03-0112346610.3390/jmse12030466Early Diagenetic Processes in the Sediments of the Krka River EstuaryNuša Cukrov0Neven Cukrov1Dario Omanović2Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, CroatiaDivision for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, CroatiaDivision for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, CroatiaTo study the processes that govern the post-depositional mobility of metals in the estuarine sediment, five sediment cores were sampled in the Krka River estuary (Croatia). The obtained concentration ranges in the pore water were 0.057–49.7 μM for Fe, 0.310–100 μM for Mn, 0.068–26.8 nM for Co, 0.126–153 nM for Cu, 11.5–2793 nM for Zn, 0.222–31.3 nM for Pb, 4.09–59.4 nM for U, 38.8–2228 nM for Mo, and 0.065–2.29 nM for As. The vertical distribution of metals in the dissolved and solid fraction of the sediment, coupled with other diagenetic tracers (e.g., dissolved sulphide), demonstrate the importance of early diagenetic reactions, in particular Fe and Mn oxyhydroxide and sulphate reduction, for the cycling of metals in the sediment. The redox zonation in the sediment was compressed, and the suboxic zone occurs immediately below the sediment–water interface. The estimated benthic fluxes in the estuary were 5220 kg y<sup>−1</sup> for Fe, 27,100 kg y<sup>−1</sup> for Mn, 6.00 kg y<sup>−1</sup> for Co, 20.5 kg y<sup>−1</sup> for Cu, 5.16 kg y<sup>−1</sup> for Pb, 111 kg y<sup>−1</sup> for Mo, and 87.3 kg y<sup>−1</sup> for As. The riverine input was more important than the benthic flux, except in the case of Mn and Fe.https://www.mdpi.com/2077-1312/12/3/466trace metalspore watersedimentearly diagenesisbenthic fluxesAdriatic Sea |
| spellingShingle | Nuša Cukrov Neven Cukrov Dario Omanović Early Diagenetic Processes in the Sediments of the Krka River Estuary Journal of Marine Science and Engineering trace metals pore water sediment early diagenesis benthic fluxes Adriatic Sea |
| title | Early Diagenetic Processes in the Sediments of the Krka River Estuary |
| title_full | Early Diagenetic Processes in the Sediments of the Krka River Estuary |
| title_fullStr | Early Diagenetic Processes in the Sediments of the Krka River Estuary |
| title_full_unstemmed | Early Diagenetic Processes in the Sediments of the Krka River Estuary |
| title_short | Early Diagenetic Processes in the Sediments of the Krka River Estuary |
| title_sort | early diagenetic processes in the sediments of the krka river estuary |
| topic | trace metals pore water sediment early diagenesis benthic fluxes Adriatic Sea |
| url | https://www.mdpi.com/2077-1312/12/3/466 |
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