Huang Baorong hbr@tongji.edu.cn Tongji University https://ror.org/03rc6as71 Zhou Zhe zhe_research@outlook.com Tongji University https://ror.org/03rc6as71 2026 Microbially Mediated Transformation of Labile Iron in Estuarine Surface Sediments and Its Impact on Element Cycling dataset bundled publication https://doi.org/10.1594/PANGAEA.995685 2026-07-03T08:54:23 Estuarine sediments are critical zones for element cycling between land and ocean, where redox oscillation driven by unsteady sedimentation amplifies the role of iron (Fe) as a reversible regulator for the benthic cycling of trace elements. The research involved simulating reoxygenation conditions after anaerobic incubation, followed by analyzing the geochemical changes in aqueous phase samples. Iron concentrations were measured spectrophotometrically, while major and trace element compositions were determined using ICP-OES and ICP-MS. In the dataset, the elements dynamics in the microbially mediated labile Fe transformation under variable redox conditions were reported. Sediment samples were collected at three sites in the East China Sea during a field trip to Chongming Island, Shanghai (November 21st, 2024), and a cruise with R/V Bo Hai Ke from July 5th to 10th, 2023(NORC2023-02). Sample of S1 was collected from the upper <1 cm of coastal sediment during low tide. Samples of S2 and S3 were collected with a box sampler. Surface sediments (depth < 1 cm) were scraped on board and stored at 4 °C until further processing. Sediments from the Changjiang estuary land-ocean transect were autoclaved at 121°C for 20 min to eliminate indigenous microbes. Incubations were performed in an anoxic N₂ glovebox using ASW medium buffered with 25 mmol/l HEPES, with 20 mM glucose as electron donor, and adjusted to pH 7.8. Sterilized sediment was added to 2 g L⁻¹, and Ferrimonas balearica was inoculated to 2×10⁸ cells ml. A molybdate (20 mol/lM) treatment was included to inhibit sulfate reduction. After anaerobic incubation, reoxygenation was simulated by 2-day air exposure. Samples were then centrifuged and filtered for analysis. Huang Baorong hbr@tongji.edu.cn Zhou Zhe zhe_research@outlook.com Su Ni Li Jiangtao Yang Shouye syyang@tongji.edu.cn 0000-0002-4810-6598 Zhang Yalei accepted Microbially mediated transformation of labile iron in estuarine surface sediments: Implications for benthic trace element cycling journal article Journal of Geophysical Research: Biogeosciences 2024-09-25T00:00:00 2025-03-03T00:00:00 4 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Type of study | Study type | Sample type | Samp type | Sampling date/time, experiment | Date/time sampling exp | For site 1 to 3 | Treatment | Treat | Incubation duration | Inc dur | Phosphate | [PO4]3- | Inductively coupled plasma optical emission spectrometer (ICP-OES), Agilent 5800 VDV | Manganese | Mn | Lithium | Li | Inductively Coupled Plasma Mass Spectrometer (ICP-MS), Agilent, 7900 | Vanadium | V | Chromium | Cr | Cobalt | Co | Nickel | Ni | Copper | Cu | Zinc | Zn | Molybdenum | Mo | Barium | Ba | Lead | Pb | Aluminium | Al | Total | Rare-earth elements | REE | Sample code/label | Sample label | Leaching time | Leaching T | Iron | Fe | Cadmium | Cd | Light rare-earth elements | LREE | Middle rare-earth elements | MREE | Heavy rare-earth elements | HREE | Iron, labile, per unit sediment dry mass | Fe tot/sed dm | Ultraviolet-visible Spectrophotometer, Shimadzu, UV-2600; followed by phenanthroline assay | Chi-square test | Iron, labile, per unit sediment dry mass, standard deviation | Fe tot/sed dm std dev | Calculated citable element cycling Estuarine sediment Experiment Laboratory experiment method18304 method19334 method50 method9698 param18452 param18454 param185520 param1874 param1875 param1876 param2212 param25453 param500085 param516121 param527767 param532916 param532919 param532920 param532924 param565651 param565652 param565653 param565654 param565655 param565656 param565657 param565658 param565659 param565660 param565661 param565662 param565663 param565668 param565669 param63 param64 param66 param7059 param722 param758 param790 param96278 pi118151 author118151 author118163 author118164 author56449 author63265 author98123 geocode1599 inst1769 journal8820 license21 ref140456 term38841 term78222 term78223 term801