{
  "abstract": "Oxidation–reduction potential (Eh) is widely used as an in situ indicator of redox conditions in aquatic environments, and field electrodes typically record a mixed potential generated by multiple concurrent interfacial redox reactions. Beyond a simple Nernstian interpretation based on a single redox couple, here we ask what mechanistic information can be extracted from an observed relationship between Eh and a single chemical species under mixed-potential conditions, focusing on dissolved oxygen. Using a linearized mixed-potential formulation, we show that the sensitivity can be decomposed into (i) Nernstian contributions and (ii) kinetic contributions from multiple reactions. Consequently, an approximately constant log-linear ln [O2]–Eh sensitivity does not require dominance by a single couple (e.g., O2 H2O); it can also arise when the effective reaction set contributing to the mixed potential and their relative weights remain approximately invariant, suggesting that this relationship can serve as a compact indicator of redox-network stability. To examine whether such slope stability and breakdown are observable in the field, we apply this interpretation to a 21-month, multi-site time series from a constructed shallow pond in Japan, where dissolved oxygen and electrode redox potential were co-measured at weekly fixed depths and along biweekly vertical profiles. Channel excavation produced a pond-wide electrical conductivity anomaly, and change-point detection was used to define pre- and post-disturbance regimes. During the pre-disturbance regime, the ln [O2]–Eh slope was relatively stable across sites. After disturbance, the inflow-proximal site exhibited a weakened slope and systematically elevated Eh relative to the pre-disturbance baseline; notably, baseline-referenced Eh deviations peaked after the EC anomaly had largely relaxed, and a follow-up survey in February 2025 indicated partial recovery. Co-located Eh and oxygen measurements can thus provide a simple, screening-level indicator of departures from a site-specific redox baseline that are consistent with disturbance-driven changes in effective redox conditions and recovery, while recognizing that complementary speciation measurements remain necessary to identify the underlying redox processes and dominant redox couples.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Chemistry, Biology, and Environmental Sciences, Nara Women’s University, Kita-Uoya Nishimachi, Nara 630-8506, Japan",
    "Environmental Conservation Division, Environmental and Fundamental Research Department, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan",
    "Department of Environmental and Natural Resource Sciences, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu-shi, Tokyo 183-8509, Japan"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Kyoko Morimoto"
    },
    {
      "affs": [
        1
      ],
      "name": "Mana Ito",
      "orcid": "0000-0003-3775-2516"
    },
    {
      "affs": [
        1
      ],
      "name": "Katsutoshi Ito"
    },
    {
      "affs": [
        2
      ],
      "name": "Mayumi Seto"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5e95622r2x7bv.bib",
  "cited_by": 0,
  "doi": "10.5194/bg-23-5795-2026",
  "fulltext_url": "https://bg.copernicus.org/articles/23/5795/2026/",
  "id": "5e95622r2x7bv",
  "issns": [
    "1726-4170",
    "1726-4189"
  ],
  "landing_url": "https://doi.org/10.5194/bg-23-5795-2026",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "lcc",
      "QE1-996.5"
    ],
    [
      "lcc",
      "QH501-531"
    ],
    [
      "lcc",
      "QH540-549.5"
    ],
    [
      "openalex",
      "2305|Microbial Fuel Cells and Bioremediation"
    ]
  ],
  "openalex": "W7204086040",
  "pdf_url": "https://bg.copernicus.org/articles/23/5795/2026/bg-23-5795-2026.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-01",
  "publisher": "Copernicus Publications",
  "ris": "https://research.draconitic.com/paper/5e95622r2x7bv.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T14:21:05Z",
      "native_id": "3b2bb30cd0ac40a0bed38f4d1a42cb3f",
      "source": "doaj",
      "url": "https://doi.org/10.5194/bg-23-5795-2026"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "openalex:2305|Microbial Fuel Cells and Bioremediation",
      "subfield": "environmental-science"
    }
  ],
  "title": "Redox-network reconfiguration inferred from the ln[O2]–Eh relationship under mixed-potential conditions in a shallow pond time series",
  "title_text": "Redox-network reconfiguration inferred from the ln[O2]–Eh relationship under mixed-potential conditions in a shallow pond time series",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T14:20:30Z",
  "url": "https://research.draconitic.com/paper/5e95622r2x7bv",
  "venue": "Biogeosciences",
  "versions": []
}