Environmental Geochemistry and Health最新文献

{"title":"Covariation of DOM molecular characteristics and bacterial carbon metabolism potential along a reservoir-agricultural river nutrient gradient.","authors":"Yue Jiang, Hongying Jiang, Yanhua Xie, Tianliang Zheng","doi":"10.1007/s10653-026-03552-7","DOIUrl":"https://doi.org/10.1007/s10653-026-03552-7","url":null,"abstract":"<p><p>Agricultural nutrient loading is associated with variation in dissolved organic matter (DOM) composition and microbial communities across reservoir-agricultural river continuums, yet the covariation among nutrient conditions, DOM molecular heterogeneity, and bacterial metabolic potential remains insufficiently understood. This study integrated optical spectroscopy, ultrahigh-resolution mass spectrometry, nitrate dual-isotope tracing, end-member mixing analysis (EMMA), 16S rRNA sequencing, and metagenomic functional profiling to characterize DOM sources and composition and their associations with bacterial communities in a typical reservoir-agricultural river continuum. Our results showed that nitrogen and phosphorus enrichment within agricultural river reaches systematically rearranges DOM source apportionment, with relative abundance of humic-like components (C1, C3) rising alongside elevated abundances of heteroatomic molecular formulas (CHOS, CHONS) relative to oligotrophic reservoirs. Nutrient loading reshaped DOM via exogenous input of heteroatom-rich anthropogenic organics and boosted in-situ microbial humification. EMMA modeling further indicated that anthropogenic sources contributed 37.9% to riverine DOM. Principal coordinates analysis showed that reservoir-river community differentiation coincided with nutrient and fluorescent DOM gradients. Reservoir samples were dominated by Acinetobacter, Exiguobacterium, and Clade_III and showed higher relative abundances of several genes associated with carbohydrate and aromatic compound degradation. In contrast, river communities featured humic-adapted genera (Mycobacterium, hgcl_clade, Limnohabitans, and unclassified_Sporichthyaceae) and showed higher relative abundances of genes associated with lipid utilization and terrestrial-polymer degradation. This study highlighted coordinated spatial variation in nutrient conditions, DOM characteristics, bacterial community composition, and genomic carbon metabolism potential across the reservoir-agricultural river continuum, supplying theoretical guidance for pollution control and carbon cycling regulation in anthropogenic-disturbed inland water catchments.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149220059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climate-extreme soil exposome: how drought converts contaminated agricultural soils into one-health risk hotspots.","authors":"Burhan Khalid, Muhammad Wassay, Muhammad Ans Hussain, Muhammad Ikram, Rizwan Maqbool","doi":"10.1007/s10653-026-03535-8","DOIUrl":"https://doi.org/10.1007/s10653-026-03535-8","url":null,"abstract":"<p><p>Contaminated agricultural soils are conventionally treated as static pollutant repositories whose hazard state is adequately captured by total contaminant concentration, an assumption that intensifying drought regimes are rendering untenable. This review advances the concept of a climate-sensitive soil exposome, in which drought functions as a hydro-biogeochemical driver that reorganizes the bioavailability, speciation, and biological accessibility of metals, antibiotics, pesticides, per- and polyfluoroalkyl substances, and microplastics without altering their total soil inventories. By reducing porewater connectivity, concentrating solutes within disconnected microsites, and expanding the air-water interfacial area, drought can modify the spatial co-localization and interactions among pollutant classes whose mixture-level exposure potential cannot be predicted from single-contaminant assessments. At the same time, drought imposes ecological filtering on soil microbial communities, selectively enriching stress-tolerant, biofilm-forming, and resistance-bearing taxa that, in soils co-contaminated with persistent metals and antibiotic residues, disproportionately expand antibiotic resistance genes and mobile genetic elements. Global evidence now associates aridity with elevated hospital-level antibiotic resistance rates (i.e., the frequency of resistant clinical isolates recorded in hospital surveillance data) across 116 countries, implicating climate-driven soil microbial filtering in public health consequences extending far beyond field boundaries. Drying-rewetting cycles emerge as periods of potentially elevated exposure, generating acute pulses of contaminants, resistant microorganisms, and resistance genes through crop uptake, contaminated dust inhalation, and post-drought hydrological export pathways that static, concentration-anchored monitoring frameworks may not fully capture. Future risk assessment should consider drought-rewetting transitions as primary sampling targets, adopt bioavailability-resolved and mixture-sensitive monitoring, and explicitly incorporate contaminated agricultural dust as a critically undercharacterized inhalation exposure route, prioritizing it as a research frontier in climate-sensitive soil exposome science.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149206556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and campaign-scale dynamics of trace elements in lakes and ponds of the Iowa and Nebraska - Missouri River floodplain.","authors":"Onema C Adojoh, William Trabal, Favour Adewuyi, Kayode Ayinde, Michael Bellamy, Mohammed J Meziani, Luke Monroe","doi":"10.1007/s10653-026-03525-w","DOIUrl":"https://doi.org/10.1007/s10653-026-03525-w","url":null,"abstract":"<p><p>Trace-element contamination in small floodplain water bodies can vary sharply among neighboring catchments, and regional averages may conceal individual hotspots. Water from six lakes and ponds in western Iowa and eastern Nebraska were examined during three site-wide surveys: Summer 2024, Fall 2025, and Spring 2026, yielding 18 site-campaign observations. Eleven trace elements-aluminum (Al), arsenic (As), cadmium (Cd), cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), lead (Pb), selenium (Se), and zinc (Zn) were retained after data verification, and concentrations were standardized to µg L^-1. Site-specific exceedance ratios (ER = C/S) and Heavy Metal Pollution Index (HPI) values were calculated using the study screening benchmarks. Lake Manawa had the highest mean HPI (327.13) and the highest overall mean ER (1.85), driven principally by Co (mean ER = 7.19), Pb (5.16), Mn (1.99), Al (1.94), and Cd (1.49). Among the remaining sites, Pinky's Glen had the highest mean ER (1.57), dominated by Mn (5.31), Al (3.24), and Co (3.15), whereas Steinhart Park showed elevated Mn (5.61), Co (3.05), and Al (2.59). An additive two-factor variance partition indicated that water-body identity accounted for more than 90% of variation in Al, Co, Cu, Fe, Mn, Pb, and Zn during the sampled campaigns. The campaign accounted for 95.8% of As variation and 54.2% of Cd variation. An equal-weight score based on min-max-normalized mean HPI, exceedance frequency, and mean ER ranked Lake Manawa, Pinky's Glen, and Steinhart Park as the three highest priorities for confirmatory monitoring. A recovered physicochemical survey showed the highest mean TDS and EC at Carter Lake (264.67 mg L^-1 and 529.33 µS cm^-1), water temperatures of 3.03-6.57 °C, and circumneutral mean pH (6.95-7.62). Because the three surveys occurred in different years, temporal comparisons and benchmark exceedances are interpreted as screening-level evidence. The findings support site- and analyte-specific confirmatory monitoring rather than pooled regional assessment.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149192128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A performance evaluation of a multi-soil-layering for the treatment of an olive mill wastewater.","authors":"Mohammed Zine, Halima Asli, Meriem Bamaarouf, Noureddine Touach, Latifa Tajounte, Kaoutar Kara, El Mostapha Lotfi","doi":"10.1007/s10653-026-03532-x","DOIUrl":"https://doi.org/10.1007/s10653-026-03532-x","url":null,"abstract":"<p><p>Mitigating the volumes of Olive Mill Wastewaters(OMWs) created each year presents a substantial environmental challenge for Mediterranean countries.Even though multi-soil-layering (MSL) technologies have demonstrated effectiveness in treating different types of wastewater via affordable and energy-efficient filtration systems, existing soil mixed block (SMB) mixture compositions use traditional carbon components and metal adsorbents that have only been tested independently.Consequently, little is known about the utilization of local agro-industrial residues together with iron-based adsorbents for OMW treatment.This study addresses this gap by evaluating the performance of an MSL system (consisting of an alternation of permeable layers(made of a pozzolan) and a locally sourced, low-cost SMBs (made of 70% soil, 10% charcoal, 10% Phoenix Dactylifera and 10% iron debris))-a previously untested combination for the treatment of a 50% diluted OMW.The influence of hydraulic load rate(HLR)(200,400 and 500 L day^-1m^-2) on physico-chemical parameters, such as pH, turbidity, conductivity, concentrations of ammonium (NH4⁺), orthophosphates (PO4^3-), phenolic compounds and Chemical Oxygen Demand (COD) was studied.The 200 L day^-1 m^-2 load rate allowed the MSL to treat effectively the OMW, as the highest removal rates for NH4⁺,PO4^3-, phenolic compounds and COD reached 93.42%,99.67%,96.8% and 97.41% respectively- exceeding removal rates reported for MSL systems using conventional carbon and iron amendments.An inferential statistical approach (ANOVA,Tukey HSD post-hoc testing,effect-size calculation)-not previously applied to validate MSL-OMW treatment performance-confirmed the robustness of these removal rates and identified COD as the only parameter significantly sensitive to HLR, providing quantitative design guidance for scale-up.The data revealed how SMB composition influences the geochemical retention of nutrients and phenolic compounds in the MSL, validating the SMB as an efficient barrier for controlling the human health and ecotoxicological risks associated with the disposal of untreated OMW in Mediterranean olive-growing areas.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149192020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence, spatial distribution, and ecological and human health risks of antibiotic residues in the River Jhelum.","authors":"Bakhtawar Fatima, Aamna Mahmood, Afshan Urooj, Ariba Waseem, Aqeel Mahmood, Rizwan Ullah, Saad Alamri, Hafiz Muhammad Irfan, Adeel Mahmood","doi":"10.1007/s10653-026-03539-4","DOIUrl":"https://doi.org/10.1007/s10653-026-03539-4","url":null,"abstract":"<p><p>Antibiotic residues in riverine environments are emerging contaminants of concern because of their persistence, ecological effects, and potential contribution to antimicrobial resistance. This study investigated the occurrence, spatial distribution, pollution status, and screening-level ecological and human-health risks of six antibiotics in the River Jhelum, Pakistan. Surface-water samples were collected from ten monitoring sites representing upstream, midstream, and downstream reaches during a post-monsoon sampling campaign. Antibiotics were quantified using High Performance Liquid Chromatography coupled with photodiode-array detection, while single-factor and comprehensive pollution indices and GIS-based spatial interpolation were applied to characterize contamination patterns. Azithromycin exhibited the highest concentration (20.30 µg/L), followed by ofloxacin (12.70 µg/L), ciprofloxacin (8.03 µg/L), linezolid (4.55 µg/L), cefixime (1.40 µg/L), and levofloxacin (0.51 µg/L). Azithromycin showed the greatest pollution burden across the monitoring sites investigated, whereas levofloxacin exhibited comparatively limited contamination. The comprehensive pollution assessment indicated substantial combined antibiotic contamination across the investigated river transect. Azithromycin produced the highest ecological risk quotient (RQ = 17.41), indicating high predicted ecological risk under the applied screening framework. Human health hazard quotients remained below unity, indicating non carcinogenic risks. These findings strengthen wastewater management, pharmaceutical discharge controls, and systematic monitoring of antibiotic residues in the River Jhelum.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149206579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depth-dependent trace metal speciation, bioavailability and soil-plant transfer across 55 months of vetiver phytoremediation at Bien Hoa Airbase, Vietnam.","authors":"Thao Thi Thanh Nguyen, Van Huy Dinh, Hoa Thanh Nguyen, Duc Tin Quach, Ha Thu Le, Quang Viet Ly, Van Hao Duong, Quoc Dinh Nguyen, Martine Leermakers, Yue Gao, Huong Thi Thuy Ngo","doi":"10.1007/s10653-026-03499-9","DOIUrl":"https://doi.org/10.1007/s10653-026-03499-9","url":null,"abstract":"<p><p>Long-term field evidence on how trace metal speciation and bioavailability evolve during phytoremediation of legacy-contaminated soils remains scarce, limiting exposure-relevant appraisal of residual contamination. Over 55 months, this study evaluated the performance of vetiver grass (Chrysopogon zizanioides) across depth-stratified soil profiles (0-10, 10-30, and 30-50 cm) at the contaminated Bien Hoa Airbase, Vietnam, combining a spatial survey of surface soils (n = 53) with depth-resolved profiling (n = 13 per horizon). Modified BCR sequential extraction, plant tissue analyses and ecological risk indices (mRAC, mHQ, ECI) were applied. Cd was the dominant contaminant and the only element with bioaccumulation factors (BAF) consistently exceeding 1.0, with its BAF increasing 2.3-fold over the 40-month assessment period. Speciation was element-specific: Cd occurred predominantly in labile fractions (F1 + F2 > 68%), whereas Cr and Ni remained largely residual. Although higher relative labile fractions were observed in vetiver-treated plots, absolute bioavailable concentrations declined more rapidly with depth, a pattern consistent with rhizosphere-mediated mobilisation coupled with plant interception, although the observational field design does not allow this mechanism to be established directly. An accidental fire at month 52 removed the canopy but spared the root system; enhanced BAF and translocation factors at 55 months may reflect post-fire rejuvenation, although confirmation requires further monitoring. Ecological risk indices classified 75% of locations as non- to moderately contaminated (ECI < 4), whereas the toxicity-weighted mRAC remained high, consistent with continued rhizosphere-mediated mobilisation of the labile metal pool. These findings support managed harvest-regrowth cycling to sustain phytoextraction and show that bioavailability-based indicators, rather than total concentrations, should guide decisions on when residual contamination still warrants exposure control.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149192139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Associations between fish consumption and human hair mercury: a multi-media assessment across urban and fishing communities in Guangdong Province, China.","authors":"Juan Zhao, Zhiqiang Gao, Xichao Chen, Jie Wang, Beibei Liu, Chaoxian Wei, Jingjing Gou, Zhijiao Liang, Bigui Lin","doi":"10.1007/s10653-026-03533-w","DOIUrl":"https://doi.org/10.1007/s10653-026-03533-w","url":null,"abstract":"<p><p>Human exposure to mercury, particularly methylmercury (MeHg), through fish consumption remains a public health concern in coastal communities. This study conducted a multi-media assessment of total mercury (THg) and MeHg in fish (n = 284; 12 species), rice (n = 50), and human hair (n = 449) collected from four urban coastal areas and one fishing community in Guangdong Province, China, to examine associations between fish consumption and mercury accumulation in human hair. Mercury levels varied markedly across matrices and study areas. The fishing community showed substantially higher THg concentrations in fish (mean: 158.9 μg/kg) and hair (mean: 3317.6 μg/kg) than urban areas, whereas rice contributed minimally to exposure. Fish mercury accumulation was associated with source, habitat, trophic level, and species identity, with marine wild, carnivorous, and neritic species showing the highest burdens. Among participants with complete demographic and dietary data (n = 207), multivariable models identified fishing occupation, older age, fish consumption frequency, and daily fish intake as key associated factors of hair THg and MeHg, explaining > 60% of variance. A region-level ecological analysis further linked regional fish mercury profiles to hair mercury burdens, though this association should be interpreted at the regional rather than individual level. Fish consumption accounted for most MeHg intake, and a substantial proportion of fishing community residents exceeded the provisional tolerable daily intake for MeHg. These findings identify exposure patterns and potentially higher-risk groups, and support targeted, species- and population-specific fish consumption advisories based on updated food-contamination and biomonitoring data in high-exposure coastal communities.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149180218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence, distribution and potential sources of phthalate and non-phthalate plasticizers in maternal and fetal-related biological matrices.","authors":"Dhekra Toumi, Bouthaina Souaf, Adem Bayoudh, Sana Alibi, Irene Spanò, Giusepppa Di Bella, Fahad M Alminderej, Hatem Majdoub, Hedi Ben Mansour","doi":"10.1007/s10653-026-03540-x","DOIUrl":"https://doi.org/10.1007/s10653-026-03540-x","url":null,"abstract":"<p><p>Phthalate esters (PEs), widely used as plasticizers in consumer products, are endocrine disruptors and represent a significant source of exposure for pregnant women and the fetus. This study, conducted among 198 pregnant women from middle-class backgrounds and monitored in the maternity ward in Monastir hospital (Tunisia), assessed the concentrations of several PEs in maternal and fetal biological matrices to estimate exposure levels during pregnancy. GC-MS/MS chromatographic analyses were performed on maternal samples namely, placenta, amniotic fluid, urine, and blood. Seven plasticizers, including phthalates and non-phthalates alternatives were detected namely: diisobutyl phthalate (DiBP), dibutyl phthalate (DBP), diethyl phthalate (DEP), dimethyl phthalate (DMP), di(2-ethylhexyl) terephthalate (DEHT), diisobutyl adipate (DiBA), dimethyl adipate (DMA). DEHT, was the most prevalent plasticizer despite being a \"safer\" alternative, with highest geometric mean concentration in urine (403.7 µg/kg), followed by placenta (318.6 µg/kg), blood (304.5 µg/kg), and amniotic fluid (275.0 µg/kg). Among phthalates, DiBP showed the highest concentrations in placental tissue (195.8 µg/kg) and urine (226.0 µg/kg), while DMP and DEP were mainly detected in amniotic fluid (128.2 and 64.8 µg/kg, respectively). Although the renal system contributes significantly to the elimination of these substances via urine, substantial amounts can cross the placental barrier and reach the fetus, thus posing a potential health risk. the findings highlight a clear maternal-fetal exposure continuum to PEs and underline the need for improved exposure control, especially for vulnerable populations, and support further evaluation of both PEs and their substitutes.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149180271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulfur and oxygen isotopic systematics of dissolved sulfate and relative contributions of sulfide oxidants in the Erdenet mining region, Mongolia.","authors":"Duk-Min Kim, Bayartungalag Batsaikhan, Dae-Gyu Im, Jae-Hoon Choi, Hyeon-Soo Seo, Bayartogtokh Buyankhishig, Seong-Taek Yun","doi":"10.1007/s10653-026-03531-y","DOIUrl":"https://doi.org/10.1007/s10653-026-03531-y","url":null,"abstract":"<p><p>Dissolved sulfate, a major contaminant in mining areas, is generally produced by the oxidation of sulfides by either molecular oxygen or Fe(III). Because Fe(III) oxidizes sulfides much more rapidly, it contributes more effectively to elevated SO₄^2- concentrations. This study analyzed δ³⁴S_SO4, δ¹⁸O_SO4, δ¹⁸O_H2O, and δ²H_H2O in groundwater and surface water from the Erdenet mining region, Mongolia. The potential fraction of Fe(III) as the oxidant of pyrite was inferred based on δ¹⁸O_SO4 and δ¹⁸O_H2O. Theoretical and previously reported minimum fractions appear to constrain the lower range of Fe(III) contributions, whereas sulfate reduction and gypsum dissolution may reduce the apparent fractions in some samples. In addition, gypsum precipitation appears to limit the upper range of SO₄^2- concentrations, while the dissolution of efflorescent salts may increase SO₄^2- concentrations. After excluding samples potentially influenced by these processes, a positive relationship between the potential fraction of Fe(III) as the oxidant and SO₄^2- concentration remains evident. These results suggest the potential importance of Fe(III)-mediated oxidation in controlling sulfate concentrations in mining environments. Furthermore, when additional geochemical processes are appropriately accounted for, the combined use of δ¹⁸O_SO4 and δ¹⁸O_H2O provides a systematic framework for elucidating the mechanisms of sulfide oxidation in such environments. Additionally, variations in the relationship between the potential fraction of Fe(III) as the oxidant and SO₄^2- concentration across mining environments may provide evidence for site-specific geochemical processes, such as gypsum dissolution and sulfate reduction.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149180254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Field evaluation of liquid fraction of digestates from different feedstocks on soil properties, water productivity, maize yield and economic performance.","authors":"Gamze Depel, Zeynep Demir, Derya Özalp Ünal, Ayten Namlı, Nihal Ceren Alıcı, Özgür Doğan","doi":"10.1007/s10653-026-03528-7","DOIUrl":"https://doi.org/10.1007/s10653-026-03528-7","url":null,"abstract":"&lt;p&gt;&lt;p&gt;The sustainable management of livestock and plant residues is a key challenge in modern agriculture, and the recycling of organic wastes through liquid fraction of digestates (LDs) represents a promising solution within a circular bioeconomy framework. As the reuse of organic waste in agriculture gains rapid importance within the scope of circular bioeconomy, field studies that simultaneously assess the hygienic safety, organic pollutants, and pesticide residues of biogas sludge alongside its effects on water use, yield, kernel quality, soil chemistry/enzymology, and economic performance remain limited. This study evaluated the effects of LDs obtained from three different feedstocks (digestate A: poultry+poppy plant residues; digestate B: cattle+plant residues; digestate C: poultry+cattle residues) applied at doses of 10, 30, 50 and 70 t ha⁻&lt;sup&gt;1&lt;/sup&gt; (fresh matter basis) on yield and yield components, kernel quality, soil health, water productivity and economic performance on sustainable maize production under field conditions during the 2022-2023 growing season. The results showed that LDs significantly increased maize grain yield, thousand kernel weights, cob weight, and kernel yield per cob, whereas cob diameter, cob length, harvest index, crude protein, and plant height were not significantly affected. In the soil, LDs significantly increased electrical conductivity (EC), available P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;, K&lt;sub&gt;2&lt;/sub&gt;O, Ca, Mg, Fe, Mn, and B, as well as cation exchange capacity, microbial biomass carbon, microbial respiration, urease activity, and phosphatase activity, thereby improving nutrient availability and soil biological functioning. Furthermore, kernel nutrient composition was improved, with significant increases in total N, P, K, Ca, Mn, Zn, and B contents, while total Mg, Fe, Cu, and Cr remained unaffected. Water productivity (WP) and irrigation water productivity (IWP) showed numerical variation among treatments, with the highest values observed under digestate C; however, these differences were not statistically significant. Although Salmonella spp., Listeria monocytogenes, and E. coli O157 were not detected, elevated Clostridium spp. counts indicated a potential microbiological risk, emphasizing the need for appropriate hygienization prior to agricultural use. Additionally, certain pesticide residues (e.g., permethrin) and high EC in digestate A highlight the importance of dose optimization and monitoring. Although no significant increases in exchangeable Na or potentially toxic metals were observed during the two-year field experiment, the long-term environmental fate of pesticide residues and trace metals remains uncertain, indicating that repeated LDs require continuous monitoring to ensure environmental and food safety. Overall, the findings demonstrate that LDs can be an effective organic amendment for sustainable maize production, enhancing crop productivity, soil health, and resource efficiency while supporti","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"48 16","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149180247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}