Occurrence of structural aluminium (Al) in marine diatom biological silica: visible evidence from microscopic analysis
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Published:2022-03-17
Issue:2
Volume:18
Page:321-329
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ISSN:1812-0792
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Container-title:Ocean Science
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language:en
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Short-container-title:Ocean Sci.
Author:
Tian QianORCID, Liu Dong, Yuan Peng, Li Mengyuan, Yang Weifeng, Zhou Jieyu, Wei Huihuang, Zhou Junming, Guo Haozhe
Abstract
Abstract. The global marine biogeochemical cycle of aluminium (Al) is believed to be
driven by marine diatoms, due to the uptake of dissolved Al (DAl) by living
diatoms from surface seawater. The occurrence of Al in diatom biogenic
silica (BSi) can inhibit the dissolution of BSi, thus benefiting the effects
of the ballast role of diatoms in the biological pump and forming a coupled
Si–Al biogeochemical cycle. However, the occurrence characteristic of Al in
marine diatoms is still unclear. In particular, whether or not Al is
incorporated into the structure of BSi of living diatoms is unrevealed,
resulting in difficulties in understanding the biogeochemical behaviours of
Al. In this study, Thalassiosira weissflogii, a widely distributed marine diatom in marginal seas,
was selected as the model to evaluate the occurrence of structural Al in BSi
based on culturing experiments with the addition of DAl. The structural Al
in BSi was detected by combining focused ion beam (FIB) scanning electron
microscopy and energy-dispersive X-ray spectroscopy (EDS) mapping analysis.
Visible, direct evidence of structural Al in living BSi was obtained, and
the distribution and content of this Al were revealed by the EDS-mapping
analysis. The effects of structural Al on BSi dissolution–inhibition are
discussed based on the content of this Al. The fundamental results indicate
the significant contribution of marine diatoms to the biogeochemical
migration of marine Al.
Funder
National Natural Science Foundation of China State Key Laboratory of Marine Environmental Science 5511 Science and Technology Innovation Talent Project of Jiangxi Province Science and Technology Planning Project of Guangdong Province
Publisher
Copernicus GmbH
Subject
Cell Biology,Developmental Biology,Embryology,Anatomy
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