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| DOI | 10.1111/gbi.12372 |
| Magnesium isotope fractionation during microbially enhanced forsterite dissolution | |
| Brewer A.; Harrold Z.; Chang E.; Gorman-Lewis D.; Teng F.-Z. | |
| 发表日期 | 2020 |
| ISSN | 14724677 |
| 起始页码 | 225 |
| 结束页码 | 236 |
| 卷号 | 18期号:2 |
| 英文摘要 | Bacillus subtilis endospore-mediated forsterite dissolution experiments were performed to assess the effects of cell surface reactivity on Mg isotope fractionation during chemical weathering. Endospores present a unique opportunity to study the isolated impact of cell surface reactivity because they exhibit extremely low metabolic activity. In abiotic control assays, 24Mg was preferentially released into solution during forsterite dissolution, producing an isotopically light liquid phase (δ26Mg = −0.39 ± 0.06 to −0.26 ± 0.09‰) relative to the initial mineral composition (δ26Mg = −0.24 ± 0.03‰). The presence of endospores did not have an apparent effect on Mg isotope fractionation associated with the release of Mg from the solid into the aqueous phase. However, the endospore surfaces preferentially adsorbed 24Mg from the dissolution products, which resulted in relatively heavy aqueous Mg isotope compositions. These aqueous Mg isotope compositions increased proportional to the fraction of dissolved Mg that was adsorbed, with the highest measured δ26Mg (−0.08 ± 0.07‰) corresponding to the highest degree of adsorption (~76%). The Mg isotope composition of the adsorbed fraction was correspondingly light, at an average δ26Mg of −0.49‰. Secondary mineral precipitation and Mg adsorption onto secondary minerals had a minimal effect on Mg isotopes at these experimental conditions. Results demonstrate the isolated effects of cell surface reactivity on Mg isotope fractionation separate from other common biological processes, such as metabolism and organic acid production. With further study, Mg isotopes could be used to elucidate the role of the biosphere on Mg cycling in the environment. © 2019 John Wiley & Sons Ltd |
| 关键词 | adsorptionbacteriumchemical weatheringdissolutionforsteriteisotopic fractionationmagnesiumBacillus subtilis |
| 语种 | 英语 |
| 来源机构 | Geobiology |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/133197 |
| 推荐引用方式 GB/T 7714 | Brewer A.,Harrold Z.,Chang E.,et al. Magnesium isotope fractionation during microbially enhanced forsterite dissolution[J]. Geobiology,2020,18(2). |
| APA | Brewer A.,Harrold Z.,Chang E.,Gorman-Lewis D.,&Teng F.-Z..(2020).Magnesium isotope fractionation during microbially enhanced forsterite dissolution.,18(2). |
| MLA | Brewer A.,et al."Magnesium isotope fractionation during microbially enhanced forsterite dissolution".18.2(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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