Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia
<p>Selenium (Se) is an essential micronutrient for aquatic organisms. Despite its importance, our current knowledge of the biogeochemical cycling of dissolved Se in tropical estuaries is limited, especially in Southeast Asia. To gain insights into Se cycling in tropical peat-draining rivers an...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-02-01
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| Series: | Biogeosciences |
| Online Access: | https://www.biogeosciences.net/17/1133/2020/bg-17-1133-2020.pdf |
| _version_ | 1811319854854045696 |
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| author | Y. Chang M. Müller Y. Wu S. Jiang W. W. Cao J. G. Qu J. L. Ren X. N. Wang E. M. Rao X. L. Wang A. Mujahid M. F. Muhamad E. S. A. Sia F. H. A. Jang J. Zhang |
| author_facet | Y. Chang M. Müller Y. Wu S. Jiang W. W. Cao J. G. Qu J. L. Ren X. N. Wang E. M. Rao X. L. Wang A. Mujahid M. F. Muhamad E. S. A. Sia F. H. A. Jang J. Zhang |
| author_sort | Y. Chang |
| collection | DOAJ |
| description | <p>Selenium (Se) is an essential micronutrient for aquatic organisms. Despite its importance, our current knowledge of the biogeochemical cycling of
dissolved Se in tropical estuaries is limited, especially in Southeast Asia. To gain insights into Se cycling in tropical peat-draining rivers and
estuaries, samples were collected from the Rajang, Maludam, Sebuyau, Simunjan, Sematan, Samunsam and Lunda rivers and estuaries in western Sarawak,
Malaysia, in March and September 2017 and analysed for various forms of Se (dissolved inorganic and organic). Mean total dissolved Se (TDSe),
dissolved inorganic Se (DISe) and dissolved organic Se concentrations (DOSe) were 2.2 <span class="inline-formula">nmol L<sup>−1</sup></span> (range: 0.7 to 5.7 <span class="inline-formula">nmol L<sup>−1</sup></span>),
0.18 <span class="inline-formula">nmol L<sup>−1</sup></span> (range: less than the detection limit to 0.47 <span class="inline-formula">nmol L<sup>−1</sup></span>) and 2.0 <span class="inline-formula">nmol L<sup>−1</sup></span> (range: 0.42 to
5.7 <span class="inline-formula">nmol L<sup>−1</sup></span>), respectively. In acidic, low-oxygen, organic-rich blackwater (peatland-draining) rivers, the concentrations of DISe were
extremely low (near or below the detection limit, i.e. 0.0063 <span class="inline-formula">nmol L<sup>−1</sup></span>), whereas those of DOSe were high. In rivers and estuaries that
drained peatland, DOSe <span class="inline-formula">∕</span> TDSe ratios ranged from 0.67 to 0.99, showing that DOSe dominated. The positive relationship between DISe and salinity and the
negative relationship between DOSe and salinity indicate marine and terrestrial origins of DISe and DOSe, respectively. The positive correlations of
DOSe with the humification index and humic-like chromophoric dissolved organic matter components in freshwater river reaches suggest that peat soils
are probably the main source of DOSe. The DOSe fractions may be associated with high molecular weight peatland-derived aromatic and black carbon
compounds and may photodegrade to more bioavailable forms once transported to coastal waters. The TDSe flux delivered by the peat-draining rivers
exceeded those reported for other small rivers and is quantitatively more significant than previously thought.</p> |
| first_indexed | 2024-04-13T12:49:39Z |
| format | Article |
| id | doaj.art-d92d980d605545c0b9b06650c78bd1ae |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-04-13T12:49:39Z |
| publishDate | 2020-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-d92d980d605545c0b9b06650c78bd1ae2022-12-22T02:46:16ZengCopernicus PublicationsBiogeosciences1726-41701726-41892020-02-01171133114510.5194/bg-17-1133-2020Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of MalaysiaY. Chang0M. Müller1Y. Wu2S. Jiang3W. W. Cao4J. G. Qu5J. L. Ren6X. N. Wang7E. M. Rao8X. L. Wang9A. Mujahid10M. F. Muhamad11E. S. A. Sia12F. H. A. Jang13J. Zhang14State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaFaculty of Engineering, Computing and Science Swinburne, University of Technology, Kuching 93350, MalaysiaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaKey Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, ChinaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaKey Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, ChinaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, ChinaFaculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kuching 93350, MalaysiaFaculty of Engineering, Computing and Science Swinburne, University of Technology, Kuching 93350, MalaysiaFaculty of Engineering, Computing and Science Swinburne, University of Technology, Kuching 93350, MalaysiaFaculty of Engineering, Computing and Science Swinburne, University of Technology, Kuching 93350, MalaysiaState Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China<p>Selenium (Se) is an essential micronutrient for aquatic organisms. Despite its importance, our current knowledge of the biogeochemical cycling of dissolved Se in tropical estuaries is limited, especially in Southeast Asia. To gain insights into Se cycling in tropical peat-draining rivers and estuaries, samples were collected from the Rajang, Maludam, Sebuyau, Simunjan, Sematan, Samunsam and Lunda rivers and estuaries in western Sarawak, Malaysia, in March and September 2017 and analysed for various forms of Se (dissolved inorganic and organic). Mean total dissolved Se (TDSe), dissolved inorganic Se (DISe) and dissolved organic Se concentrations (DOSe) were 2.2 <span class="inline-formula">nmol L<sup>−1</sup></span> (range: 0.7 to 5.7 <span class="inline-formula">nmol L<sup>−1</sup></span>), 0.18 <span class="inline-formula">nmol L<sup>−1</sup></span> (range: less than the detection limit to 0.47 <span class="inline-formula">nmol L<sup>−1</sup></span>) and 2.0 <span class="inline-formula">nmol L<sup>−1</sup></span> (range: 0.42 to 5.7 <span class="inline-formula">nmol L<sup>−1</sup></span>), respectively. In acidic, low-oxygen, organic-rich blackwater (peatland-draining) rivers, the concentrations of DISe were extremely low (near or below the detection limit, i.e. 0.0063 <span class="inline-formula">nmol L<sup>−1</sup></span>), whereas those of DOSe were high. In rivers and estuaries that drained peatland, DOSe <span class="inline-formula">∕</span> TDSe ratios ranged from 0.67 to 0.99, showing that DOSe dominated. The positive relationship between DISe and salinity and the negative relationship between DOSe and salinity indicate marine and terrestrial origins of DISe and DOSe, respectively. The positive correlations of DOSe with the humification index and humic-like chromophoric dissolved organic matter components in freshwater river reaches suggest that peat soils are probably the main source of DOSe. The DOSe fractions may be associated with high molecular weight peatland-derived aromatic and black carbon compounds and may photodegrade to more bioavailable forms once transported to coastal waters. The TDSe flux delivered by the peat-draining rivers exceeded those reported for other small rivers and is quantitatively more significant than previously thought.</p>https://www.biogeosciences.net/17/1133/2020/bg-17-1133-2020.pdf |
| spellingShingle | Y. Chang M. Müller Y. Wu S. Jiang W. W. Cao J. G. Qu J. L. Ren X. N. Wang E. M. Rao X. L. Wang A. Mujahid M. F. Muhamad E. S. A. Sia F. H. A. Jang J. Zhang Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia Biogeosciences |
| title | Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia |
| title_full | Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia |
| title_fullStr | Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia |
| title_full_unstemmed | Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia |
| title_short | Distribution and behaviour of dissolved selenium in tropical peatland-draining rivers and estuaries of Malaysia |
| title_sort | distribution and behaviour of dissolved selenium in tropical peatland draining rivers and estuaries of malaysia |
| url | https://www.biogeosciences.net/17/1133/2020/bg-17-1133-2020.pdf |
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