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https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00027170
2023-01-16T05:07:29Z
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Major and minor elemental compositions of streambed biofilms and its implications of riverine biogeochemical cycles
Mori, Naoki
Sugitani, Kenichiro
Yamamoto, Mariko
Tomioka, Rie
Sato, Miyako
Harada, Naomi
open access
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Streambed biofilm
Chemical compositions
Dam reservoir
Heavy metals
Chemical compositions of streambed biofilms from a major river of central Japan (the Kushida River) were obtained, with data of associated sediments (fine-grained fractions < 63 μm) and dissolved components of waters, in order to provide preliminary information about biogeochemical significance of streambed biofilms. During the sampling period (July 31st to August 3rd, 2013), dissolved components of the river waters were influenced by the dam reservoir. Concentrations of NO3−, silica (as Si), SO4^2−, PO4^3− and Ca^2+ decreased across the dam, whereas Fe and Mn increased across the dam, and then decreased downstream rapidly. Streambed biofilms contain significant amount of non-nutrient elements such as Al (up to 21% as Al2O3 on water and others-free basis), indicating that they are contaminated as siliciclatic (silt and clay) materials. Siliciclastic materials in the biofilms are basically compositionally similar to fine-grained (<63 μm) fractions of streambed sediments. However, some elements such as Ca, P, Mn, and Zn are markedly enriched in the biofilms. Particularly, Mn concentrations in the biofilm samples collected just below the dam reservoir are very high (∼4.0 wt %), probably due to accumulation from the discharged water. Concentrations of trace elements such as P, Cr, Cu, Zn and V appear to be controlled by amounts of Fe-oxides and/or Mn-oxides in biofilms. Numbers of factors are involved in controlling chemical compositions of streambed biofilms, including amount of contaminated siliciclastics, authigenic mineral formation, adsorption of dissolved materials and microbial metabolisms. As demonstrated by this study, systematic analyses including major elements and comparison with associated sediments and waters could reveal biogeochemistry of this complex system.
ファイル公開:2020-12-01
Elsevier
2018-12
eng
journal article
AM
http://hdl.handle.net/2237/00029369
https://nagoya.repo.nii.ac.jp/records/27170
https://doi.org/10.1016/j.envpol.2018.08.007
0269-7491
Environmental Pollution
243
308
317
https://nagoya.repo.nii.ac.jp/record/27170/files/SugitaniRevised2.pdf
application/pdf
1.1 MB
2020-12-01