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Limnology

, Volume 20, Issue 2, pp 215–224 | Cite as

Variable relationships between the hydrophobic fraction of dissolved organic matter and metals in Scottish freshwater before the estuarine mixing zone

  • Hajime Sato
  • Morimaru Kida
  • Satoko Yamano
  • Haruka Sonoda
  • Nobuhide FujitakeEmail author
Research paper

Abstract

The organic-Fe association in Scottish freshwater rivers has received little attention compared with in the estuarine mixing zone. We collected 201 water samples from rivers and lakes in Scotland across different sampling years and seasons. Relationships among the hydrophobic (HPO) fraction of dissolved organic matter (DOM), specific UV absorbance (SUVA254), and dissolved metals (Al and Fe) were examined to better understand their co-transportation in Scottish waters. The average DOM, HPO fraction, Fe, and Al concentrations for all the samples co-varied and were lower during winter than during summer. There was a strong positive correlation between DOM and HPO fraction concentrations (R2 = 0.99, p < 0.0001). A significant positive correlation was also found between the HPO fraction and Fe and Al concentrations. The regression slope indicating the overall relationships between the HPO fraction and Fe concentrations differed by as much as 12 times depending on both the sampling period and the river. These slope differences were not significantly determined by the chemical structures of DOM, SUVA254, or Al and Cu concentrations. These results suggest that the Fe transport capacities vary among the Scottish rivers because of other factors such as seasonal effects (temperature and the level of water table) and a suspended solid concentration in the water column.

Keywords

Complex DOM Iron Peat SUVA254 

Notes

Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP15H02805.

Compliance with ethical standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

10201_2018_569_MOESM1_ESM.docx (898 kb)
Supplementary material 1 (DOCX 898 kb)

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Copyright information

© The Japanese Society of Limnology 2019

Authors and Affiliations

  1. 1.Graduate School of Agricultural ScienceKobe UniversityKobeJapan

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