Applied Geochemistry最新文献

{"title":"Identification of molybdenum immobilization mechanisms in naturally contaminated excavated rocks and soils stabilized with zero-valent iron","authors":"Maxime Brandely ,&nbsp;Samuel Coussy ,&nbsp;Denise Blanc-Biscarat ,&nbsp;Hicham Khodja ,&nbsp;Rémy Gourdon","doi":"10.1016/j.apgeochem.2025.106433","DOIUrl":"10.1016/j.apgeochem.2025.106433","url":null,"abstract":"<div><div>Chemical stabilization of naturally contaminated excavated materials could be used to limit environmental risks. Nevertheless, due to the low levels of contamination in such materials a more precise characterization of immobilization mechanisms is required. To overcome this lack of data, zero valent iron (Fe⁰) was used as a stabilizing agent at rates of 1 or 3 wt% in four different sets of excavated rock and soil from the Paris basin that were contaminated with low levels of molybdenum (with a total content of from 2 to 11 mg Mo kg⁻¹) but that involved leachability issues. Molybdenum (Mo) release was reduced by at least one order of magnitude after adding Fe⁰ over a wide pH range (i.e. 2 &lt; pH &lt; 12). Geochemical modeling of pH-dependent leaching tests was done to identify potential immobilizing mechanisms. For Mo, experimental results were well represented at pH close to and below the natural pH of the samples by considering surface adsorption with iron (hydr-)oxides involving non-, mono- and bi-protonated Mo surface species. Zero valent iron stabilization remained relatively significant under alkaline conditions where complexation of anionic species was not favored. These results suggested that stronger binding mechanisms are likely to occur concomitantly with surface adsorption. Finally, thanks to their high sensitivity, μ-particle-induced X-ray emission (μ-PIXE) and μ-Rutherford backscattering spectroscopy (μ-RBS) were successfully used to directly observe Mo presence in iron (hydr-)oxides formed after addition of Fe⁰.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"188 ","pages":"Article 106433"},"PeriodicalIF":3.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of near-surface waters in identifying elemental associations with geothermal-sourced Li","authors":"Andrew David Robinson ,&nbsp;Sanem Acikalin ,&nbsp;Gavin Stewart ,&nbsp;Brendan A. Bishop ,&nbsp;Leslie J. Robbins ,&nbsp;Shannon L. Flynn","doi":"10.1016/j.apgeochem.2025.106428","DOIUrl":"10.1016/j.apgeochem.2025.106428","url":null,"abstract":"<div><div>Unprecedented demand for lithium (Li) is being driven by its use in electric vehicle batteries. Currently, the majority of Li comes from pegmatite mining and salar brines, however, new sources such as geothermal brines will be required to meet future demand. The North Pennines, Northern England has been found to host brines with lithium concentrations exceeding 90 mg/L from 411 to 995 <em>m</em>. However, deep subsurface water chemistry for the region is limited to a single abandoned borehole, necessitating the use of other techniques in assessing the resource potential of these brines. This work investigated the potential of surface and near-surface water samples from abandoned mine workings to expand the known geographic extent of the underlying Li brine resource. Li concentrations were 1.9–784 μg/L at the 44 locations sampled. Principal component, cluster, and covariate analyses identified two distinct water chemistry clusters mostly related to dimension 1 of the PCA (22.5 % of variance) and included alkalinity, Ca, Cd, Cl, F, K, Li, Mg, Na, Se, and SO₄²⁻; the “near surface” or potentially orebody related group which included Al, As, Cu, Eu, Fe, P, Pb, V, and Y. Two smaller clusters are present on the positive and negative axis of dimension two (14.1 %); on the positive is B, Ba, Br, Cr, pH, and Si, and on the negative, Co, Mn, Ni, Sc, Sr, and Zn. The Cambokeels Mine, 0.5 km from the original borehole, had the highest Li concentration of 78.4 mg/L. However, the deep brine signature and Li enrichment were also found at a cluster of mines 15 km away, significantly expanding the geographical extent of the North Pennine Li brine resource. These findings show that relatively low-cost elemental analysis and statistical analyses could be a promising exploration tool for regions where there is limited data. Developing tools using geochemical finger printing of near-surface waters to identify Li resources in deeper geothermal brines will be essential for the cost-effective development of critical minerals.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"188 ","pages":"Article 106428"},"PeriodicalIF":3.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Permeate fluxes from desalination of brines and produced waters: A reactive transport modeling study","authors":"Sergi Molins ,&nbsp;Nicolas Spycher ,&nbsp;Sarah M. Dischinger ,&nbsp;Mostafa Nassr ,&nbsp;Ji Yeon Lee ,&nbsp;Jacob Johnston ,&nbsp;Nils Tilton ,&nbsp;Kristofer L. Gleason ,&nbsp;Benny D. Freeman ,&nbsp;William T. Stringfellow ,&nbsp;Daniel J. Miller","doi":"10.1016/j.apgeochem.2025.106429","DOIUrl":"10.1016/j.apgeochem.2025.106429","url":null,"abstract":"<div><div>The increasing interest in the use of membrane systems to desalinate inland brackish water, agricultural drainage, and industrially produced wastewater demands improved means of predicting desalination system performance under variable feedwater compositions. The interaction among water flow, solute transport, and chemical composition in these systems impacts permeate flux evolution. Here, an established multicomponent reactive transport simulator that accounts for these coupled processes is applied to compute osmotic pressure and permeate fluxes in reverse osmosis (RO) systems. The model is first validated by predicting permeate fluxes for a set of benchtop crossflow experiments subject to a range of feed flow rates and compositions, under fouling and non-fouling conditions. Results compare favorably with measured data that show that solutions with similar total dissolved solids concentrations but different compositions result in different permeate fluxes. The model is then applied to predict permeate fluxes from the desalination of produced waters using a commercial spiral wound RO module. For NaCl-dominant brines, at total dissolved salt concentrations (TDS) below about 70 g/L, permeate fluxes are inversely proportional to water mole fraction as the latter is a reasonable approximation of water activity (i.e. ideal mixing). In the case of Ca–Cl-, Na–CO₃- and Na–SO₄-dominant brines below about 70 g/L TDS, this relationship does not hold as well and tends to overpredict osmotic pressure and thus underpredict permeate fluxes. However, the opposite becomes true at higher TDS values for typical produced waters. The scaling potential of these waters is also computed by allowing the precipitation of minerals above their saturation limit on the RO membrane. This work demonstrates how reactive transport models developed for the analysis of waters from geological systems can be extended to improve process design, optimization, and control in desalination systems from produced waters and beyond.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"189 ","pages":"Article 106429"},"PeriodicalIF":3.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biogeochemical cycle of radium: Insights into alkaline-earth cations budget and evidence of hidden vegetation uptake","authors":"S. Rihs ,&nbsp;E. Lascar ,&nbsp;F. Chabaux ,&nbsp;L. Pourcelot ,&nbsp;P. Calmon ,&nbsp;P.O. Redon ,&nbsp;C. Galy ,&nbsp;M.P. Turpault","doi":"10.1016/j.apgeochem.2025.106418","DOIUrl":"10.1016/j.apgeochem.2025.106418","url":null,"abstract":"<div><div>The migration of radionuclides in the environment represents a major current issue, especially radium (Ra) that hold one of the main radiation exposure hazards among Naturally Occurring Radioactive Materials. This study aims to assess the biogeochemical radium cycling within a forested ecosystem and to highlight the relevance of Ra isotopes for understanding calcium and other alkaline earth cations behavior. This study was carried out at the INRAE-Andra experimental beech-forested site of Montiers (Meuse, France). ²²⁶Ra and ²²⁸Ra concentrations were measured in various compartments of the ecosystem: soil solutions, vegetation and soil samples. In-situ experiment of litter decomposition was also performed.</div><div>Variations in the ²²⁸Ra/²²⁶Ra isotopic ratio across ecosystem compartments allowed to distinguish between ²²⁸Ra-rich weathering inputs and ²²⁸Ra-poor biological return fluxes, thereby enabling to trace the radium cycle. Radium exported by soil solutions predominantly originates from litter decomposition which begins releasing radium only 12–18 months after litterfall. Conversely, the (²²⁸Ra/²²⁶Ra) ratio in fine roots implied that trees absorbed Ra primarily from mineral soil weathering rather than from litter-derived sources. As a result, approximately 95 % of litter-derived Ra remains in the soil rather than being reabsorbed by vegetation, challenging traditional assumptions of significant reabsorption in cation budget models.</div><div>Flux calculations showed vegetation uptake and return fluxes dominate over drainage or atmospheric inputs fluxes. (²²⁸Ra/²³²Th) radioactive disequilibrium within the soil enabled estimation of Ra leaching flux and subsequent vegetation uptake. Results revealed that 7–23 % of the absorbed Ra is incorporated into annual, non-perennial biomass, while 12–43 % is allocated to new biomass increments. Consequently, 34–80 % of the Ra absorbed by vegetation appears to accumulate in unexpected, presumably long-lived, perennial tree structures such as sapwood. These results imply sustained accumulation over multiple years in perennial tissues. While this immobilization of Ra within beech trees may not be generalizable to all tree species, it highlights the need for specific species of detailed analyses across all tree compartments - including radial variations in sapwood - to avoid underestimating vegetation uptake, particularly for alkaline-earth cations such as calcium.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106418"},"PeriodicalIF":3.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective recovery of native copper from basalt tailings using alkaline glycinate solution","authors":"Wei Xiong ,&nbsp;Jonathan Yang ,&nbsp;Sophia Bauer","doi":"10.1016/j.apgeochem.2025.106416","DOIUrl":"10.1016/j.apgeochem.2025.106416","url":null,"abstract":"<div><div>Mafic and ultramafic rocks present an intriguing pathway for CO₂ capture through strategic enhancements to the natural silicate weathering cycle. Simultaneously, these rock types are often hosts to appreciable amounts of metals critical to U.S. energy independence, particularly in the context of alkaline mine tailings from historical metal mining. The research and scientific prerogative, then, is to identify promising mafic and ultramafic feedstocks and conduct exploratory studies to effectively recover these critical minerals while preserving the potential for mineral carbonation. The Keweenaw Peninsula of Michigan hosts the largest native Cu reservoir within basalt in the world and experienced a rich history of Cu production spanning from pre-historic times to the mid-1900s. Today, much of the Cu mining legacy remains as mine waste tailings. In this study, we examined the Cu extractability from Keweenaw Basalt tailings using a sodium glycinate solution, in comparison with acid and sodium hydroxide leaching. Experimental results showed an 85 % Cu extraction rate using sodium glycinate as the extraction solution with negligible release of other cations from the basalt. The kinetic and extraction mechanisms of Cu selective recovery using glycinate solution were discussed using time-resolved experimental data and kinetic geochemical modeling. Theoretical estimation of carbon mineralization potential of all the existing basalt waste tailings (∼500 million tons) can reach 85.5 MMT CO₂. A total of 0.786 MMT Cu can be recovered with sodium glycinate, with a value of 7.7 billion USD. This novel application of alkaline glycinate for selective Cu recovery from basalt mine tailings demonstrates the viability of selective metal recovery using a non-hazardous chemical while preserving CO₂ capture potential and presents a potential pathway toward reducing energy-related emissions and providing an unconventional domestic source of critical minerals.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106416"},"PeriodicalIF":3.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study of palsa bog organic matter stabilization in response to holocene climate change using 13C NMR and FTICR MS","authors":"Roman Vasilevich ,&nbsp;Alexander Zherebker ,&nbsp;Oleg Kuznetsov","doi":"10.1016/j.apgeochem.2025.106417","DOIUrl":"10.1016/j.apgeochem.2025.106417","url":null,"abstract":"<div><div>The ¹³C NMR and high-resolution mass spectrometry (HRMS) methods have been employed to elucidate the principal pathways of soil organic matter (SOM) stabilization in the peat deposit of palsa bogs in the European Arctic. Extremes of labile/condensed constituents and structural moieties have been found to be related to climatic and hydrological conditions during different periods of the Holocene. The initial stage of SOM stabilization includes decomposition of plant residues, formation of (pro)humic substances (HSs) molecules from high-molecular-weight precursors, and primary transformation of HS molecules with degradation of the most labile fragments.</div><div>The more favorable climatic conditions of the Early Holocene (Atlantic Optimum) and Middle Holocene (SB2) determined the botanical composition of the peat, which was dominated by sedge and tree-sedge communities with high contents of lignin components and, as a consequence, a greater proportion of aromatic fragments, characterized by thermo-biodynamic resistance in the humic acids (HAs) of horizons in the lower and central parts of the profile. Older HAs, which underwent intense degradation were enriched in the N,S-containing components as compared to HAs from surface layers. This is in turn accompanied by an overall decrease in the proportion of unoxidised aliphatic and carbohydrate fragments. A substantial proportion of highly condensed fragments were identified in HAs by HRMS. It was suggested that aromatic and condensed HA molecules contain long-chain substituents which contribute to the content of aliphatic carbon. The ratio of pentosans to hexosans in HAs is demonstrated to increase down the peat profile as a consequence of the redistribution of the dominant peat formers. The HA branching indices demonstrate a significant transformation of long-chain structures and an increase in the contribution of substituted aliphatic fragments in the HA structure.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106417"},"PeriodicalIF":3.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of bentonite colloids on sorption of Eu in crystalline rock and its minerals","authors":"Noora Pakkanen ,&nbsp;Louison Biez ,&nbsp;Ester M. Jolis ,&nbsp;Artem Dziuba ,&nbsp;Xiaodong Li ,&nbsp;Marja Siitari-Kauppi","doi":"10.1016/j.apgeochem.2025.106415","DOIUrl":"10.1016/j.apgeochem.2025.106415","url":null,"abstract":"<div><div>This study examines Eu sorption on two Olkiluoto crystalline rocks and their minerals in low-salinity groundwater conditions. Sorption was studied as a function of ¹⁵¹EuCl₃ molarity and pH. In addition, the competitive effect of MX-80 bentonite colloids on Eu sorption was examined. To understand Eu's behavior in different experimental scenarios, the factors influencing Eu sorption were further investigated by means of CEC, and zeta potential analysis of the materials used. The study revealed that the strongest sorbents for Eu under the defined conditions were biotite and biotite-rich heterogeneous metatexitic gneiss. Depending on the rock matrix used and the colloid concentration of the solution, the introduction of bentonite colloids as a competing agent significantly reduced the sorption of Eu on rock matrix. These findings provide insights into radionuclide mobility in natural and engineered systems.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106415"},"PeriodicalIF":3.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accurate prediction of carbon monoxide in aqueous solutions for geological sequestration applications","authors":"Li Sun ,&nbsp;Jierong Liang","doi":"10.1016/j.apgeochem.2025.106414","DOIUrl":"10.1016/j.apgeochem.2025.106414","url":null,"abstract":"<div><div>Accurate prediction of solubilities in aqueous solutions is crucial for the geological sequestration of carbon monoxide (CO). This study utilizes the electrolyte version of the Cubic-Plus-Association (CPA) Equation of State to calculate the saturated properties including saturated vapor pressure, saturated liquid-phase density, and saturated vapor-phase density of pure CO, its solubilities in pure water, and its solubilities in aqueous sodium chloride solutions. The model accuracy is validated against experimental data, showing relative average deviations within 3.0 % for saturated liquid-phase density, within 1.0 % for both saturated vapor pressure and saturated vapor-phase density, 4.7 % for CO solubilities in pure water, and 1.3 % for CO solubilities in aqueous sodium chloride solutions. This work not only analyzes the phase behavior of CO in aqueous solutions but also provides an in-depth discussion on the dissolution mechanisms of CO in these solutions. The results demonstrate that the electrolyte version of the CPA Equation of State is a robust model capable of accurately predicting CO solubilities and the complex phase behavior of CO in aqueous solutions across a wide range of temperatures, pressures, and salt concentrations.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106414"},"PeriodicalIF":3.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decadal transport of trace elements in a cave system based on 16 years monitoring data: Implications for paleoclimate reconstruction","authors":"Xin Fu ,&nbsp;Yan Yang ,&nbsp;Jingyao Zhao ,&nbsp;Yidong Li ,&nbsp;Xiaomin Chen ,&nbsp;Zhimao Ye ,&nbsp;Mingyang Li ,&nbsp;Jingfeng Lin ,&nbsp;Yanzhi Xu","doi":"10.1016/j.apgeochem.2025.106413","DOIUrl":"10.1016/j.apgeochem.2025.106413","url":null,"abstract":"<div><div>The trace element ratios (X/Ca, X = Mg, Sr, Ba) of stalagmites are closely correlated with local hydroclimatic changes and are becoming increasingly important proxies for paleoclimate reconstruction. However, it remains unclear whether the decadal variations in the X/Ca ratios can reflect the signals of the Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Variability (AMV) in East Asia. Here, 16 years (2009–2024) of monitoring data on the trace element composition of cave water in Jiguan Cave, located in the middle and lower reaches of the Yellow River in China, were combined with an analysis of X/Ca ratios in stalagmite DSY1201 from the nearby Dongshiya Cave. The primary objective was to comprehensively explore the intricate relationship between the X/Ca ratios and the regional hydroclimatic variations. Our investigation revealed that the decadal changes in the X/Ca Principal Component 1 (PC1) exhibited a significant negative correlation with the PDO. This correlation was likely predominantly caused by the synergistic effects of prior calcite precipitation (PCP), water–rock interaction (WRI), and other factors. Notably, under drought conditions in Jiguan Cave, WRI dominates the hydro-chemical evolution of the cave water, while the reduction in the recharge flux and the prolongation of the water residence time jointly induce a marked enhancement in the X/Ca ratios. Correlation analysis further demonstrated that the PDO significantly modulates the amplitude of the X/Ca-PC1 variability by regulating the frequency of extreme precipitation or drought events during critical years. In addition, the multi-proxy records (X/Ca-PC1, δ¹³C, and δ¹⁸O) from stalagmite DSY1201 revealed similar relationships and patterns in the AMV and PDO phase transitions during the 1960s and late 1990s. Thus, we ultimately suggest that the AMV and PDO play important roles in the decadal variations in the intensity of the East Asian summer monsoon (EASM) and the spatial pattern of the EASM rainfall, in combination with the AMV-Northern Hemisphere (ANH) teleconnection and the Pacific-East Asia (PEA) teleconnection, respectively. This may be recorded by the X/Ca ratios in the karst cave systems in the EASM area.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106413"},"PeriodicalIF":3.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ligand exchange by As(V) enhanced desferrioxamine B-induced goethite dissolution: Insights into As mobilization in groundwater systems","authors":"Simeng Li ,&nbsp;Wei Xiu ,&nbsp;Xin Liu ,&nbsp;Zhixin Fang ,&nbsp;Jonathan R. Lloyd ,&nbsp;Huaming Guo","doi":"10.1016/j.apgeochem.2025.106412","DOIUrl":"10.1016/j.apgeochem.2025.106412","url":null,"abstract":"<div><div>The dissolution of As-bearing Fe(III) (oxyhydr)oxides is the key process leading to arsenic (As) enrichment in groundwater, which can be enhanced by organic ligands secreted by microorganisms, such as siderophores. However, the roles of organic ligand-induced dissolution of Fe(III) (oxyhydr)oxides in As mobilization are poorly understood. To address this issue, we examined the dissolution kinetics of pure goethite, As(V)-bearing goethite, and As(III)-bearing goethite induced by the trihydroxamate siderophore desferrioxamine B (DFOB) under anoxic conditions and the associated impact of As mobility. DFOB-induced goethite dissolution followed classic surface-controlled dissolution kinetics. As(V) promoted DFOB-induced goethite dissolution, which was attributed to the presence of Fe-As(V) complexes acting as ligand shuttles. However, As(III) slightly inhibited DFOB-induced goethite dissolution, due to the smaller surface area of narrow and rounded (021) crystal facets of As(III)-bearing goethite. Moreover, during DFOB-induced dissolution of As-bearing goethite, the percentages of released As to total As adsorption in DFOB-As(V)-Gt series (13.85 ± 1.52%) were significantly higher than those (9.82 ± 4.66%) in DFOB-As(III)-Gt series, which were linearly positively correlated with goethite dissolution. Therefore, the present findings emphasized the importance of organic ligand-induced dissolution of As-bearing Fe(III) (oxyhydr)oxides as a potential pathway for mobilizing As in groundwater systems.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"187 ","pages":"Article 106412"},"PeriodicalIF":3.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}