Chemosphere最新文献

{"title":"Role of molybdenum compounds in enhancing denitrification: Structure-activity relationship and the regulatory mechanisms","authors":"Ying Zhang ,&nbsp;Hejiao Sun ,&nbsp;Caicai Lu ,&nbsp;Haibo Li ,&nbsp;Jianbo Guo","doi":"10.1016/j.chemosphere.2024.143433","DOIUrl":"10.1016/j.chemosphere.2024.143433","url":null,"abstract":"<div><div>The effect and regulatory mechanisms of molybdenum compounds (MoO₂, MoS₂, MoSe₂ and MoSi₂) on denitrification were investigated by structure-activity relationships, electrochemical characteristics, microbial metabolism analysis and bacterial community distribution. All the assessed molybdenum compounds exhibited the enhancement effect on denitrification, in the order of MoS₂ &gt; MoSi₂ &gt; MoSe₂ &gt; MoO₂, with MoS₂ increasing 7.08-fold in 12 h. Analysis of structure-activity relationships suggested that the molybdenum compounds with lower negative redox potential and higher redox reversibility were favorable for promoting denitrification. According to the morphology observation, the interactions between Mo compounds and denitrifying bacteria may be beneficial to extracellular electron transfer. Molybdenum compounds with electron transfer capability facilitated an increase in electron capacitance from 835.1 to 1011.3 μF, promoting the electron exchange rate during denitrification. In the denitrification electron transport chain, the molybdenum compounds upregulated nicotinamide adenine dinucleotide and denitrifying enzyme activity, as well as facilitated the abundance of quinone pools, ATP translocation, and cytochrome <em>c</em> related proteins. Moreover, Mo compounds enriched functional bacteria such as electroactive bacteria and denitrifying functional bacteria. Notably, Mo ions in molybdenum compounds may provide active sites for nitrate reductase, optimizing the electron distribution of the denitrification process and thus improved the partial denitrification efficiency. This work aimed to further understand the regulatory mechanisms of molybdenum on denitrification electron transfer in the compound state and to anticipate the catalytic role of Mo compounds for sustainable water treatment.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"367 ","pages":"Article 143433"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142407379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Human exposure to heavy metals and possible public health risks via consumption of mussels M. galloprovincialis from the Albanian sea cost","authors":"Enkeleda Ozuni ,&nbsp;Egon Andoni ,&nbsp;Marta Castrica ,&nbsp;Claudia M. Balzaretti ,&nbsp;Gabriele Brecchia ,&nbsp;Stella Agradi ,&nbsp;Giulio Curone ,&nbsp;Federica Di Cesare ,&nbsp;Nour Elhouda Fehri ,&nbsp;Blerina Luke ,&nbsp;Mehmet Erman Or ,&nbsp;Esra Akkaya ,&nbsp;Oğuzhan Yavuz ,&nbsp;Laura Menchetti ,&nbsp;Lek Prendi ,&nbsp;Nural Pastacı Özsonacı ,&nbsp;Alev Meltem Ercan ,&nbsp;Fatma Ateş ,&nbsp;Dino Miraglia","doi":"10.1016/j.chemosphere.2024.143689","DOIUrl":"10.1016/j.chemosphere.2024.143689","url":null,"abstract":"<div><div>Heavy metals in the marine environment are significant contaminants that readily bioaccumulate in the tissues of aquatic organisms, particularly in filter-feeding animals such as bivalve molluscs. Human exposure to elevated concentrations of heavy metals, including essential elements such as Fe, Cu, and Zn, through the consumption of seafood can lead to various pathological effects. Research has demonstrated that among bivalve molluscs, mussels are the most effective indicators for monitoring marine pollution. Consequently, this study focused on the species <em>Mytilus galloprovincialis</em> to evaluate the levels of Al, As, Cd, Cr, Cu, Fe, Mg, Ni, Pb, and Zn in the two primary harvesting areas of Albania and to assess the associated human health risks from mussel consumption. The results revealed a concerning situation, particularly for Pb and Cd, with average concentrations of 2.15 μg/g and 4.14 μg/g, respectively, significantly exceeding the limits established by Regulation (EC) No. 915/2023. The levels of the other investigated elements also raised concerns, as only half of them were within the dietary intake values recommended by scientific authorities for weekly consumption of 250 g of mussels.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"368 ","pages":"Article 143689"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142607781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Further exploitation of metabolic potential for catechol biodegradation of Klebsiella sp. CD33","authors":"Xinger Xie ,&nbsp;Qibai Tian ,&nbsp;Jiahui Liu ,&nbsp;Xuan Zhang ,&nbsp;Xinyu Ye ,&nbsp;Xian Zhang","doi":"10.1016/j.chemosphere.2024.143737","DOIUrl":"10.1016/j.chemosphere.2024.143737","url":null,"abstract":"<div><div>Microbial-mediated degradation of phenolic pollutants (e.g., catechol) has been a critical concern for sewage treatment, while exploiting the strain resources and fully characterizing the metabolic potential of functional microbes for toxic refractory catechol are the key and study-worthy issues. In this study, up to 32 strains originally isolated from phenol-contaminated environments were phylogenetically affiliated with the genus <em>Klebsiella</em> and identified to have the ability of catechol degradation, with strain CD33 as the excellent one. Single-factor experiments determined that strain CD33 exhibited a highly efficient catechol degradation under the conditions of temperature 35 °C, initial pH value of 7.0, and inoculum volume of 30.0% (<em>v</em>/<em>v</em>). To preliminarily validate the possible pathway of catechol biodegradation, concentration variation of the initial enzyme (i.e., catechol 1,2 dioxygenase) and the corresponding metabolic intermediate (i.e., <em>cis,cis</em>-muconic acid) were detected, suggesting that strain CD33 can degrade the catechol uniquely via the <em>ortho</em>-cleavage pathway. Furthermore, a combination of genome-wide identification, homologous modeling, and gene expression analysis was employed to elucidate the complete pathway of catechol degradation, especially in which a novel branch mediated by <em>CMBL</em> gene was responsible for the direct conversion of (+)-muconolactone into 3-oxoadipic acid. Collectively, this study extends our understanding of catechol degradation of <em>Klebsiella</em> spp., which may provide an alternative promising avenue for the practical application of pollutant remediation.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"368 ","pages":"Article 143737"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Insecticides used for controlling cotton mealybug pose a threat to non-target bumble bees","authors":"Roberto Catania ,&nbsp;Marta Bonforte ,&nbsp;Lívia Maria Negrini Ferreira ,&nbsp;Gustavo Ferreira Martins ,&nbsp;Maria Augusta Pereira Lima ,&nbsp;Michele Ricupero ,&nbsp;Lucia Zappalà ,&nbsp;Gaetana Mazzeo","doi":"10.1016/j.chemosphere.2024.143742","DOIUrl":"10.1016/j.chemosphere.2024.143742","url":null,"abstract":"<div><div>Bumble bees (<em>Bombus</em> spp., Hymenoptera, Apidae) play a crucial role in pollinating greenhouse tomato crops. However, tomato production is constantly threatened by different invasive pests that often lead to the increased use of pesticides, with negative consequences for pollinators. The cotton mealybug <em>Phenacoccus solenopsis</em> has recently been reported in Mediterranean tomatoes and its chemical control raises concerns also regarding bumble bees. In the laboratory, we evaluated the acute toxicity and sublethal effects in <em>B</em>. <em>terrestris</em> workers exposed to the diet contaminated with four insecticides (acetamiprid, pyriproxyfen, sulfoxaflor, and thiamethoxam), potentially used to control <em>P</em>. <em>solenopsis</em>. Sulfoxaflor and thiamethoxam significantly reduced the survival of <em>B</em>. <em>terrestris</em>, while acetamiprid and pyriproxyfen altered its feeding behaviour, and the bumble bees were unable to detect the contaminated solution. Moreover, neurotoxic symptoms were observed in bees exposed to acetamiprid and alterations of the midgut were detected in bees exposed to both acetamiprid and pyriproxyfen. These results show that insecticides with low levels of toxicity to bumble bees (e.g. acetamiprid and pyriproxyfen), can cause sublethal effects on them, increasing concern about the use of these substances. Our findings provide valuable insights as regards optimizing bumble bee pollination services with chemical pest control within the context of Integrated Pest and Pollinator Management.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"368 ","pages":"Article 143742"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metabolomic and microbiomic resilience of Hong Kong oysters to dual stressors: Zinc oxide nanoparticles and low salinity","authors":"Jie Lu ,&nbsp;Tuo Yao ,&nbsp;Shengli Fu ,&nbsp;Lingtong Ye","doi":"10.1016/j.chemosphere.2024.143722","DOIUrl":"10.1016/j.chemosphere.2024.143722","url":null,"abstract":"<div><div>Zinc oxide nanoparticles, increasingly used in industrial and consumer products, and low salinity, exacerbated by climate change-induced alterations in precipitation patterns, represent significant environmental pressures in estuarine and coastal environments. This study advances previous research on their impacts on Hong Kong oysters (<em>Crassostrea hongkongensis</em>) by integrating metabolomics of hepatopancreas and gills with intestinal microbiomics. Employing advanced multi-omics integration methods, our analysis reveals novel insights into metabolic resilience under combined stress conditions. This resilience is characterized by coordinated, organ-specific adjustments in energy metabolism (<span>d</span>-glucose 1-phosphate in hepatopancreas, cytidine in gills), antioxidant defenses (glutathione, meso-2,6-diaminoheptanedioate, pimelic acid in hepatopancreas; indole, 3-(3-hydroxyphenyl)propanoic acid in gills), immune function (<span>l</span>-glutamine, ergocalciferol in hepatopancreas; argininosuccinic acid in gills), and membrane stability (lanosterin in hepatopancreas, allantoin in gills). Notably, under dual stressors, we observed a previously undescribed stabilization of microbial alpha diversity and certain phyla, an absence of distinctive biomarkers, and certain metabolic activity stabilization within the intestinal microbiota. These findings suggest robust compensatory mechanisms that maintain physiological homeostasis and microbial balance under stress, contrasting with primarily negative impacts reported in previous studies. Integration of metabolomic and microbiomic data revealed coordinated responses between microbial community changes and metabolic adjustments, particularly in osmoregulation, energy metabolism and antioxidant defenses, under dual stressors. This comprehensive approach provides a more realistic model of environmental challenges, revealing sophisticated adaptive strategies in Hong Kong oysters. Our study offers critical insights for understanding bivalve resilience, informing conservation strategies, and managing marine ecosystems in the face of increasing anthropogenic pressures.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"368 ","pages":"Article 143722"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Evaluating AGS efficiency in PHA synthesis and extraction integrated with nutrient removal: The impact of COD concentrations","authors":"Quan Yuan ,&nbsp;Song Chen ,&nbsp;Yun Chen ,&nbsp;Xinyu Zhang ,&nbsp;Yuqing Lou ,&nbsp;Xueting Li ,&nbsp;Qian Liang ,&nbsp;Yanping Zhang ,&nbsp;Yingxue Sun","doi":"10.1016/j.chemosphere.2024.143708","DOIUrl":"10.1016/j.chemosphere.2024.143708","url":null,"abstract":"<div><div>As natural and biodegradable biopolymers, Polyhydroxyalkanoates (PHA) were synthetized by aerobic granules sludge (AGS) in a sequential batch reactor in this study. The effect of different COD concentrations on PHA accumulation and nutrients removal were investigated. At the same time, different pretreatment methods for PHA extraction, including NaClO pretreatment for extracellular polymeric substances (EPS) removal, Na₂CO₃ pretreatment for EPS recovery, and grinding pretreatment to reduce particle size and augment the surface area available for interaction with the extraction solvent, were compared. The results showed that the PHA yield increased more than 2 times (from 91.1 to 233.3 mgPHA/gCDW (cell dry weight)) when COD concentration increased from 800 to 1600 mg/L. Polyhydroxybutyrate (PHB) and polyhydroxyvalerate (PHV) both accounted for half of the total, while PHB fraction rose to 71% when COD concentration went up to 1600 mg/L. The PHB can be consumed 3 times faster than PHV. High COD concentration (1600 mg/L) adversely impacted the structure stability of AGS and the phosphorus removal efficiency, while the system consistently exhibited robust nitrogen removal capabilities, with ammonium and TN removal efficiencies exceeding &gt;90%. The dominant bacteria shifted from <em>Flavobacterium</em> to <em>Halomona</em> and <em>Hydrogenophaga</em> as the COD concentration increased. In terms of PHA extraction, Na₂CO₃ pretreatment, which was used for EPS recovery, had the best PHA recovery with nearly 100% purity and EPS removal efficiency compared with NaClO and grinding pretreatments.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"368 ","pages":"Article 143708"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Spatio-temporal analysis of water chemistry and ecotoxicological risk characterisation for a constructed pilot-scale pit lake in the Athabasca oil sands region, Canada","authors":"Banamali Panigrahi ,&nbsp;Lorne E. Doig ,&nbsp;Catherine Estefany Davila-Arenas ,&nbsp;Immanuela Ezugba ,&nbsp;Karsten Liber","doi":"10.1016/j.chemosphere.2024.143679","DOIUrl":"10.1016/j.chemosphere.2024.143679","url":null,"abstract":"<div><div>Substantial quantities of fine tailings and oil sands process affected water (OSPW) require reclamation in the Athabasca oil sands (AOS) region, Canada. Towards this end, Lake Miwasin was created as a pilot-scale pit lake containing treated fluid tailings (bottom sediment) capped with a blend of OSPW and surface water. This is a recent approach to waste reclamation and long-term monitoring is ongoing to determine the trajectory of water quality in this test lake. The current study characterized spatial and temporal changes in surface water chemistry using a wireless sensor network (WSN), particularly to identify contaminant release from the consolidating tailings and potential periods of sediment resuspension. The WSN technology was deployed during the open water season from September 2020 to October 2022 to remotely measure water quality parameters at different depths of the water column. Field measurements and manual water sampling were conducted periodically to validate sensor measurements and to analyse additional variables requiring more complex analysis. During the study, increased electrical conductivity (EC) near the sediment-water interface during water column stratification indicated expression of pore water with elevated salt content, as the bottom tailings progressively consolidated. A decreasing trend in EC towards the end of the monitoring season suggested water input from the surrounding catchment and possibly a decline in porewater expression. A Tier 1 screening-level risk assessment using hazard quotients (HQs) was conducted for individual metals using Canadian water quality benchmarks and published toxicity data. Total osmolarity was used to identify risks associated with major ions. Cumulative HQs for trace elements were &gt;1 but decreased over time. The risk due to major ions was &lt;1 for all years and seasons except 2019 and winter 2020. Modelling results indicated that the predicted 90^th percentile HQs for Se and As were 1.6 and 0.44, respectively, suggesting that Se represents a potential ecotoxicological risk and should be further investigated. Overall, water quality monitoring and modelling insights gained from this study have the potential to inform AOS pit lake design and prediction of reclamation trajectories.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"368 ","pages":"Article 143679"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142634515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Quantification and ecotoxicological contribution of volatile compounds in produced water effluents","authors":"Matteo Ottaviani ,&nbsp;Neri Bonciani ,&nbsp;Markus Varlund Strange ,&nbsp;Emil Hoffmann Bohr ,&nbsp;Lars Michael Skjolding ,&nbsp;Karen Louise Feilberg","doi":"10.1016/j.chemosphere.2024.143659","DOIUrl":"10.1016/j.chemosphere.2024.143659","url":null,"abstract":"<div><div>Produced water (PW) is a significant byproduct of offshore oil and gas production, constituting a major waste stream in the North Sea. Existing regulations address only the dispersed aliphatic hydrocarbon content in PW, and limited attention is given to other potentially hazardous compounds, including benzene, toluene, ethyl benzene and xylene (BTEX), polycyclic aromatic hydrocarbons (PAHs), phenols, water-soluble petroleum constituents as well as production-related chemicals. In this study, Danish oil production PW samples were subjected to purge and trap extraction on granular activated carbon for volatile compounds identification and quantification by GC-MS analysis. The obtained analytical data correlate with toxicity assessments conducted on three trophic levels, bacteria (<em>Aliivibrio fischeri</em>), algae (<em>Skeletonema costatum)</em> and copepods (<em>Acartia tonsa)</em> on the whole effluent as well as on treated samples. The removal of the PW volatile fraction by purging experiments resulted in a decrease in toxicity response from 37% ± 23–65% ± 16 across the tested species. The chemicals identified in this study and their toxicity response enhance the comprehension of the PW effluent composition and inform the development of strategies for offshore reservoir wastewater.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"367 ","pages":"Article 143659"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142570629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Unscrambling why plastics aren't detectable in chicken eggs","authors":"Anum Tariq ,&nbsp;Elvis D. Okoffo ,&nbsp;Angelo Fenti ,&nbsp;Hongrui Fu ,&nbsp;Kevin V. Thomas","doi":"10.1016/j.chemosphere.2024.143584","DOIUrl":"10.1016/j.chemosphere.2024.143584","url":null,"abstract":"<div><div>Several food groups have been reported to contain varying concentrations of plastics. This study was designed to quantitatively investigate for the first time in Australia the presence of plastics in store-bought chicken eggs. Three commonly consumed brands of free-range, free-range organic, barn-laid and backyard (home-laid) chicken egg samples were analyzed for seven common polymers (i.e., polypropylene, polyethylene, polyvinyl chloride, polyethylene terephthalate, polystyrene, poly-(methylmethacrylate) and polycarbonate). Samples were extracted by enzyme digestion and pressurized liquid extraction, followed by quantitative analysis through double-shot microfurnace pyrolysis coupled to gas chromatography-mass spectrometry. No plastics were detected at concentrations &gt; limit of detection (LOD) (from 0.04 μg/g for PS to 0.22 μg/g for PVC) in the egg samples analyzed, regardless of brand and category, suggesting limited exposure of Australians to plastics from consuming eggs This study provides valuable baseline data and underscores the importance of continued monitoring to ensure the safety and integrity of food supplies in the face of rising environmental plastic pollution.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"367 ","pages":"Article 143584"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142514680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term landfill leachate pollution suppresses soil health indicators in natural ecosystems of a semi-arid environment","authors":"Yahya Kooch ,&nbsp;Azam Nouraei ,&nbsp;Liping Wang ,&nbsp;Xiang Wang ,&nbsp;Donghui Wu ,&nbsp;Rosa Francaviglia ,&nbsp;Jan Frouz ,&nbsp;Mohammad Kazem Parsapour","doi":"10.1016/j.chemosphere.2024.143647","DOIUrl":"10.1016/j.chemosphere.2024.143647","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Landfills pose a global issue for soil functionality and health, especially in underdeveloped nations where limited resources impede the adoption of comprehensive waste management policies, such as waste processing and sorting techniques. Leachate emissions from waste landfills are a cause for concern, primarily due to their toxic effect if left uncontrolled in the environment, and the potential for waste storage sites to produce leachate for hundreds of years after closure. Few efforts have been made to improve waste collection and disposal facilities in the world, especially in developing countries. This research aims to investigate the influence of waste leachate on soil health indicators in natural woodland and rangeland ecological systems in a semi-arid mountainous region in the north of Iran. Based on results, forest unpolluted sites (2008) exhibited the highest values of nutrient elements in litter and root components. Landfills led to a rise in soil bulk density and a simultaneous decrease in soil organic matter (SOM), porosity, aggregate stability, particulate organic carbon and nitrogen (POC and PON), as well as available nutrients, ammonium (NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt;) and nitrate (NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;−&lt;/sup&gt;) levels. Additionally, microbial parameters (respiration and biomass) and enzymes (urease, acid phosphatase, arylsulfatase and invertase) experienced a decrease in areas affected by the landfill sites over time of 2008–2023. Forest and rangeland landfill sites (2023) sites had lower density and biomass of the three earthworm groups. Acari, Collembola, nematodes, protozoans, fungi and bacteria were also reduced in landfill sites (nearly 1–2 times more in uncontaminated forest and rangeland sites). &lt;em&gt;Lumbricus terrestris&lt;/em&gt; earthworms exhibited a clear presence in all the studied sites, and this demonstrates the ability of this earthworm species to be active in severe pollution conditions. The spatial pattern of soil cadmium and lead changes indicates the high variance of these characteristics under the influence of landfills in the study sites. Finally, the soil health indicators (according to soil physical, chemical, and biological parameters) decreased from forest unpolluted sites in 2008 to rangeland landfill sites in 2023, which is linked to the release of landfill leachate. These results are noteworthy for all countries and governments that rely on natural ecosystems for waste management without engineering operations or technical intervention. Furthermore, both governments and stakeholders must implement effective waste management systems. The research offers valuable information that can assist decision-makers engaged in sustainable solid waste management in Iran and comparable areas. Besides that, it is highly recommended to prioritize recycling and phytoremediation processes. Ultimately, worldwide efforts to achieve environmental sustainability need a significant focus on the effective management of hazardous ","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"367 ","pages":"Article 143647"},"PeriodicalIF":8.1,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142549446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}