Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan
Study Region: Lake Kasumigaura, a shallow, hypereutrophic lake in Japan. Study focus: Because nitrate (NO3–) is an oxidant, it suppresses the release of PO43- from bottom sediments through its role in the oxidation/reduction reactions of Fe. We investigated whether NO3- can suppress the release of P...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Journal of Hydrology: Regional Studies |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581825000576 |
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| Summary: | Study Region: Lake Kasumigaura, a shallow, hypereutrophic lake in Japan. Study focus: Because nitrate (NO3–) is an oxidant, it suppresses the release of PO43- from bottom sediments through its role in the oxidation/reduction reactions of Fe. We investigated whether NO3- can suppress the release of PO43- at Lake Kasumigaura. New hydrological insights for the region: Sediment analyses revealed no significant correlation between porewater NO3– concentrations and either PO43– concentrations or the fluxes of PO43– from the sediments. Furthermore, the porewater NO3– concentration was approximately 0 mg N L–1 at depths below the sediment surface. We further observed that the relationship between oxidation-reduction potential (ORP) and Fe concentrations exhibited U-shaped characteristics. The oxidation and reduction reactions of Fe appeared to occur at depths below 10 cm, significantly deeper than the layers where PO43⁻ release takes place. The negligible concentration of NO3– in the sediment porewater, as well as the relationship between Fe and P species, appears to reflect that NO3- did not suppress PO43- release from sediment at Lake Kasumigaura. |
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| ISSN: | 2214-5818 |