{
  "abstract": "The coupled mineral dissolution-precipitation process plays a critical role in natural and engineered systems with fluid-rock interaction including geological CO 2 sequestration and contamination treatment of groundwater. A representative scenario is the reaction between limestone and acidic, sulfate-bearing solutions, where the dissolution of carbonate minerals drives gypsum precipitation. Previous studies have investigated the impact of this coupled process on hydraulic parameters through core-flooding experiments. However, the interplay between calcite dissolution (CaCO 3 ) and secondary precipitation (CaSO 4 ) as well as its influence on the reaction rate of CaCO 3 remains unclear. Here, we combine flow visualization experiments in limestone-based microfluidics with post-experiment SEM-EDS characterization to probe how sulfate concentration affects both precipitation morphology and CaCO 3 dissolution rates under the same pH condition (pH=1). Two distinct dissolution-precipitation coupling regimes have been identified. At low sulfate concentrations, the dissolution-dominated regime causes continuous dissolution of limestone throughout experiments because the porous gypsum layer permits continuous acid infiltration into the rock surfaces. Conversely, high sulfate concentrations induce a precipitation-dominated regime, reducing dissolution rates by an order of magnitude as a dense, thick layer completely shields the reactive surface area. We find a critical sulfate concentration threshold that triggers regime transition, wherein the released calcium concentration equilibrates with the supplied sulfate in solution, facilitating the formation of a dense coating layer. Quantified results indicate that the average dissolution rate decreases linearly with the saturation index by one order of magnitude as sulfate concentration increases from 0 to 0.2 mol/L. These findings provide insights into coupled geochemical processes and offer practical guidance for predicting reaction rates in reactive transport modeling.",
  "abstract_shown": true,
  "affiliations": [
    "State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China",
    "State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China; Corresponding authors."
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yanan Zhang"
    },
    {
      "affs": [
        1
      ],
      "name": "Ran Hu"
    },
    {
      "affs": [
        1
      ],
      "name": "Chenxing Zhou"
    },
    {
      "affs": [
        0
      ],
      "name": "Zhi-Bing Yang"
    },
    {
      "affs": [
        0
      ],
      "name": "Yifeng Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1bn43fjf7bp47.bib",
  "cited_by": 6,
  "doi": "10.1016/j.bgtech.2025.100186",
  "fulltext_url": "http://www.sciencedirect.com/science/article/pii/S2949929125000269",
  "id": "1bn43fjf7bp47",
  "issns": [
    "2949-9291"
  ],
  "landing_url": "https://doi.org/10.1016/j.bgtech.2025.100186",
  "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",
      "QH301-705.5"
    ],
    [
      "openalex",
      "2305|CO2 Sequestration and Geologic Interactions"
    ]
  ],
  "openalex": "W4411127417",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-30",
  "publisher": "KeAi Communications Co., Ltd.",
  "ris": "https://research.draconitic.com/paper/1bn43fjf7bp47.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T13:47:17Z",
      "native_id": "1d4abd6b8deb4a3080160df49d11d406",
      "source": "doaj",
      "url": "https://doi.org/10.1016/j.bgtech.2025.100186"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "openalex:2305|CO2 Sequestration and Geologic Interactions",
      "subfield": "environmental-science"
    }
  ],
  "title": "Pore-scale investigation of shielding effects on CaCO",
  "title_text": "Pore-scale investigation of shielding effects on CaCO",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T13:47:17Z",
  "url": "https://research.draconitic.com/paper/1bn43fjf7bp47",
  "venue": "Biogeotechnics",
  "versions": []
}