Barium isotopic fractionation during strong weathering of basalt in a tropical climate
Barium (Ba) is an element which is toxic to humans, plants, and animals. Deciphering the geochemical behavior of Ba in soils is fundamental for assessing the potentials risks posed by Ba. Ba isotopes are a potentially robust tracer of Ba in soils. In this study, the controlling factors of Ba isotopi...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-10-01
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| Series: | Environment International |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0160412020318511 |
| _version_ | 1819016093120856064 |
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| author | Yingzeng Gong Zhen Zeng Wenhan Cheng Ying Lu Lili Zhang Huimin Yu Fang Huang |
| author_facet | Yingzeng Gong Zhen Zeng Wenhan Cheng Ying Lu Lili Zhang Huimin Yu Fang Huang |
| author_sort | Yingzeng Gong |
| collection | DOAJ |
| description | Barium (Ba) is an element which is toxic to humans, plants, and animals. Deciphering the geochemical behavior of Ba in soils is fundamental for assessing the potentials risks posed by Ba. Ba isotopes are a potentially robust tracer of Ba in soils. In this study, the controlling factors of Ba isotopic fractionation in a latosol profile were investigated through sequential-extraction experiments. Furthermore, dissolution experiments were conducted to understand Ba isotopic fractionation during the dissolution of basalts. The sequential-extraction experiments revealed δ137/134Ba ratios in various fractions that were remarkably heterogeneous: −0.28‰ to −0.15‰ in the exchangeable fraction; −0.32‰ to −0.16‰ in reducible Fe-Mn (oxyhydr)oxides; and 0.06‰ to 0.46‰ in residues. This indicates that light Ba isotopes are preferentially adsorbed on secondary minerals and associated with Fe-Mn (oxyhydr)oxides. Both processes play important roles in storing Ba originally released from minerals. Results of the sequential-extraction and dissolution experiments revealed that light Ba isotopes favored fluids during the dissolution of silicate minerals, while heavy Ba isotopes were prone to being released from interlayers of micaceous layers. Collectively, the dissolution of minerals, adsorption on secondary minerals, and formation of easily reducible Fe-Mn (oxyhydr)oxides govern Ba isotope fractionation and Ba transport in soils. |
| first_indexed | 2024-12-21T02:42:09Z |
| format | Article |
| id | doaj.art-860a4b6b318c4046b112bb1c69657a02 |
| institution | Directory Open Access Journal |
| issn | 0160-4120 |
| language | English |
| last_indexed | 2024-12-21T02:42:09Z |
| publishDate | 2020-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environment International |
| spelling | doaj.art-860a4b6b318c4046b112bb1c69657a022022-12-21T19:18:40ZengElsevierEnvironment International0160-41202020-10-01143105896Barium isotopic fractionation during strong weathering of basalt in a tropical climateYingzeng Gong0Zhen Zeng1Wenhan Cheng2Ying Lu3Lili Zhang4Huimin Yu5Fang Huang6School of Earth Sciences, Yunnan University, Kunming, Yunnan 650500, China; CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, ChinaCAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, ChinaCAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, Anhui 230026, ChinaCollege of Natural Resources and Environment, South China Agricultural University, Guangzhou, Guangdong 510642, ChinaCAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, ChinaCAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, Anhui 230026, ChinaCAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, Anhui 230026, China; Corresponding author at: CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.Barium (Ba) is an element which is toxic to humans, plants, and animals. Deciphering the geochemical behavior of Ba in soils is fundamental for assessing the potentials risks posed by Ba. Ba isotopes are a potentially robust tracer of Ba in soils. In this study, the controlling factors of Ba isotopic fractionation in a latosol profile were investigated through sequential-extraction experiments. Furthermore, dissolution experiments were conducted to understand Ba isotopic fractionation during the dissolution of basalts. The sequential-extraction experiments revealed δ137/134Ba ratios in various fractions that were remarkably heterogeneous: −0.28‰ to −0.15‰ in the exchangeable fraction; −0.32‰ to −0.16‰ in reducible Fe-Mn (oxyhydr)oxides; and 0.06‰ to 0.46‰ in residues. This indicates that light Ba isotopes are preferentially adsorbed on secondary minerals and associated with Fe-Mn (oxyhydr)oxides. Both processes play important roles in storing Ba originally released from minerals. Results of the sequential-extraction and dissolution experiments revealed that light Ba isotopes favored fluids during the dissolution of silicate minerals, while heavy Ba isotopes were prone to being released from interlayers of micaceous layers. Collectively, the dissolution of minerals, adsorption on secondary minerals, and formation of easily reducible Fe-Mn (oxyhydr)oxides govern Ba isotope fractionation and Ba transport in soils.http://www.sciencedirect.com/science/article/pii/S0160412020318511Barium isotopesFractionationChemical weatheringLatosol |
| spellingShingle | Yingzeng Gong Zhen Zeng Wenhan Cheng Ying Lu Lili Zhang Huimin Yu Fang Huang Barium isotopic fractionation during strong weathering of basalt in a tropical climate Environment International Barium isotopes Fractionation Chemical weathering Latosol |
| title | Barium isotopic fractionation during strong weathering of basalt in a tropical climate |
| title_full | Barium isotopic fractionation during strong weathering of basalt in a tropical climate |
| title_fullStr | Barium isotopic fractionation during strong weathering of basalt in a tropical climate |
| title_full_unstemmed | Barium isotopic fractionation during strong weathering of basalt in a tropical climate |
| title_short | Barium isotopic fractionation during strong weathering of basalt in a tropical climate |
| title_sort | barium isotopic fractionation during strong weathering of basalt in a tropical climate |
| topic | Barium isotopes Fractionation Chemical weathering Latosol |
| url | http://www.sciencedirect.com/science/article/pii/S0160412020318511 |
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