Resistant rare earth phosphates as possible sources of environmental dissolved rare earth elements: Insights from experimental bio-weathering of xenotime and monazite
文献类型：期刊论文
| 作者 | He, Yilin1,2,3,4; Ma, Lingya2,3,4; Liang, Xiaoliang2,3,4 ; Li, Xurui2,3,4; Zhu, Jianxi2,3,4; He, Hongping2,3,4
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| 刊名 | CHEMICAL GEOLOGY
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| 出版日期 | 2024-09-05 |
| 卷号 | 661页码:13 |
| 关键词 | Bio-weathering Bacillus thuringiensis Rare earth elements Xenotime-(Y) Monazite-(Ce) Phosphate |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.122186 |
| 英文摘要 | Typical resistant REE phosphates xenotime and monazite are important REE carriers in various types of rocks but the supergene mobility of REE in these minerals remains controversial. In this study, we hypothesize that microbes drive the natural weathering of these resistant REE phosphates. We conducted room-temperature bioweathering experiments of xenotime concentrate with a common soil bacterium (Bacillus thuringiensis, Bt) isolated from a regolith-hosted REE deposit. Our results showed that Bt was able to promote the dissolution of xenotime and monazite in the concentrate, and the release of REE was enhanced by up to two orders of magnitude. In the bio-weathering medium buffered at pH = 6, the apparent release rates of total REE were in the range of 10- 13-10- 12 mol & sdot;m- 2 & sdot;s- 1, with Y releasing at the fastest rates of -10- 13 mol & sdot;m- 2 & sdot;s- 1. Furthermore, the estimated dissolution rate of monazite (-10-9 g & sdot;m- 2 & sdot;s- 1) was one order of magnitude higher than that of xenotime (-10-10 g & sdot;m- 2 & sdot;s- 1) due to a more refractory nature of xenotime determined by its chemical and mineralogical characteristics. On account of the extremely low solubility of REE phosphates, portions of the released REE could be re-precipitated as meta-stable phosphates during mineral dissolution, resulting in the underestimation of the release of REE from primary minerals. Bt could produce various organic acids and acidify the media, promoting the dissolution of resistant phosphates through proton- and ligand-promoted mechanisms. The results of our study suggest that microbes have a high potential to facilitate REE liberation from resistant xenotime and monazite, posing new insight into the biogeochemical cycling of REE on Earth's surface. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001247744100001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78426]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Ma, Lingya |
| 作者单位 | 1.GFZ German Res Ctr Geosci, Telegrafenberg, D-14473 Potsdam, Germany 2.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Yilin,Ma, Lingya,Liang, Xiaoliang,et al. Resistant rare earth phosphates as possible sources of environmental dissolved rare earth elements: Insights from experimental bio-weathering of xenotime and monazite[J]. CHEMICAL GEOLOGY,2024,661:13. |
| APA | He, Yilin,Ma, Lingya,Liang, Xiaoliang,Li, Xurui,Zhu, Jianxi,&He, Hongping.(2024).Resistant rare earth phosphates as possible sources of environmental dissolved rare earth elements: Insights from experimental bio-weathering of xenotime and monazite.CHEMICAL GEOLOGY,661,13. |
| MLA | He, Yilin,et al."Resistant rare earth phosphates as possible sources of environmental dissolved rare earth elements: Insights from experimental bio-weathering of xenotime and monazite".CHEMICAL GEOLOGY 661(2024):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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