Environmental Pollution最新文献

{"title":"Health check-up of a freshwater bivalve exposed to lithium","authors":"N. Lachaux, C. Cossu-Leguille, M. Zaffino, C. Simon, M. Beuret, L. Giamberini, L. Minguez","doi":"10.1016/j.envpol.2024.125573","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125573","url":null,"abstract":"Lithium (Li) has become essential for energy and digital transitions, especially as a component of rechargeable batteries. Its growing uses worldwide lead to increasing anthropogenic releases of Li into the environment, which is making Li as an emerging contaminant. It is thus critical to evaluate the ecotoxicological impact of Li, which has been poorly studied unlike its human toxicology. The objectives of this work were to assess the potential adverse effects of Li on aquatic ecosystems. Bioaccumulation and potential sublethal effects (at individual and cellular levels) of Li have been investigated in the widespread and ecologically relevant freshwater bivalve <em>Dreissena polymorpha</em>. To tackle these issues, mussels were exposed to several spiking of 40, 100 and 250 μg Li L^-1 for 28 days to reproduce anthropogenic contamination scenario. Results demonstrated that bivalves significantly accumulated Li in a dose-dependent manner, from 2 to 10 μg g^-1 dry weight (bioaccumulation factor, BAF ≈ 19 L kg^-1). Bioaccumulation of Li reached a steady-state from seven days of exposure and BAF values were constant regardless the exposure concentration indicating a tight regulation of Li body burden. Lithium exposure leads to increased energy demand associated with a higher lactate dehydrogenase activity and the decrease of protein concentrations. The observed weight gain, increased cellular metabolism, decreased apoptosis, induction of antioxidant defenses and cation content modification in <em>D. polymorpha</em> were also reported in previous studies on humans. The observed effects intensified with exposure concentration and duration, which implies an increased risk for aquatic organisms exposed to Li chronic contamination. Overall, the present study provides new knowledge concerning the impact of Li on non-targeted species, which have implications for the environmental risk assessment of Li in freshwater ecosystems. It also open new perspectives for the understanding of Li toxicokinetics and toxicodynamics on freshwater organisms.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"89 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867098","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":"Impact of different continuous fertilizations on the antibiotic resistome associated with a subtropical triple-cropping system over one decade","authors":"Jin zheng, Ya-Ying Li, Yu-Sheng Lu, Dan Wang, Chong Liu, Huan-Long Peng, Chao-Hong Shi, Kai-Zhi Xie, Kun Zhang, Li-Li Sun, Chang-Min Zhou, Wen-Jie Gu","doi":"10.1016/j.envpol.2024.125564","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125564","url":null,"abstract":"The prevalence of antibiotic resistance genes (ARGs) in agricultural soils has garnered significant attention. However, the long-term impacts of various nitroge (N)-substitution fertilization regimes on the distribution of soil ARGs and their dominant drivers in a subtropical triple-cropping system remain largely unexplored. This study employed a metagenomic approach to analyze soil ARGs, microbial communities, mobile genetic elements (MGEs), and viruses from a maize-maize-cabbage rotation field experiment with five different fertilization regimes. Soil samples were collected in 2012 and 2021. A total of 615 unique ARG subtypes were identified, with multidrug, bacitracin, and rifamycin resistance genes being the most abundant. Notably, ARG types. the continuous application of fresh chicken manure (CM) over 10 years significantly increased both the count of unique ARG subtypes and the total ARG abundance compared to other fertilization regimes, such as inorganic fertilizer and composted chicken manure. Specifically, the abundance of genes associated with antibiotic target replacement (e.g., <em>sul1</em> and <em>sul2</em>) in the CM-treated soil rose by 8.83-fold from 2021 to 2012. Our random forest analysis revealed that the abundance of three MGEs (<em>QacEdelta</em>, plasmids, and <em>IstB</em>), two viral families (<em>Myoviridae</em> and <em>Podoviridae</em>), two bacterial phyla (<em>Chloroflexi</em> and <em>Planctomycetes</em>), and two environmental factors (pH and soil organic matter (SOM)) significantly influenced the distribution of ARGs. Furthermore, variance decomposition analysis underscored the critical roles of the three MGEs and the two viral families in the dissemination of ARGs, suggesting that horizontal gene transfer (HGT) may play a key role in ARG spread. These findings enhance our understanding of how different fertilization practices influence ARG dissemination in subtropical triple-cropping agroecosystems over the long term and provide valuable insights for optimizing fertilization management strategies.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"27 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867281","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":"Reproductive toxicity and molecular mechanisms of benzo[a]pyrene exposure on ovary, testis, and brood pouch of sex-role-reversed seahorses (Hippocampus erectus)","authors":"Yuanyuan Xue, Fang Wang, Xiaolei Su, Mingzhu Li, Hansheng Yan, Shiyi Zheng, Yicong Ma, Jie Dong, Yali Liu, Qiang Lin, Kai Wang","doi":"10.1016/j.envpol.2024.125569","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125569","url":null,"abstract":"As a flagship taxa for marine ecosystems, seahorses possess a unique reproductive strategy of “male pregnancy”. They are severely threatened by marine petroleum-based pollution but the molecular mechanism involved remains unclear. We evaluated the toxic effects and mechanisms of sub-acute exposure to benzo[a]pyrene (BaP), a representative polycyclic aromatic hydrocarbon (PAH), at three environmental related dosages (0.5, 5, and 50 μg/L) on the reproductive organs of sex-role-reversed lined seahorses (<em>Hippocampus erectus</em>). BaP induced ovary, testis and brood pouch tissue damage in a concentration-dependent manner. Transcriptomic results suggested that reproductive organs of the seahorse could undergo biotransformation and detoxification of BaP via the P450 enzyme system; the differential expression of key genes related to these pathways determined the differences in the accumulation of toxic substances in the reproductive organs. Moreover, toxic substances directly induced differential tissue damage <em>in situ</em> by activating tissue-specific signaling pathways: BaP-induced ovarian apoptosis and failure by upregulation of the pro-apoptotic genes, <em>vadc1</em>, <em>traf2b</em>, <em>tnfsf10</em>, and <em>pycard</em> (<em>P</em> &lt; 0.05); inhibition of testicular function through disruption of genes associated with “ECM-receptor interaction”, “Tight junction”, and “Spermatogenesis” pathways; and interference with brood pouch immune responses, significantly suppressing the expression of <em>ripk1</em>, <em>il-1b</em>, <em>casp3a</em>, <em>apaf1</em>, <em>calr</em>, and <em>canx</em> (<em>P</em> &lt; 0.05), thereby impairing “Apoptosis”, “Phagosome”, and “Necroptosis” processes, ultimately compromising brood pouch maintenance. Toxic substances exacerbate damage to the reproductive organs in seahorses by disrupting Ca²⁺ homeostasis. At environmentally-relevant concentrations of BaP, the reproductive efficiency of seahorses may be severely affected, increasing the risk of a decline in the abundance and diversity of wild populations.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"31 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867097","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":"Unveiling the Seasonal Transport and Exposure Risks of Atmospheric Microplastics in the Southern Area of the Yangtze River Delta, China","authors":"Taiseer Hussain Nafea, Faith Ka Shun Chan, Yuyao Xu, Hang Xiao, Jun He","doi":"10.1016/j.envpol.2024.125567","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125567","url":null,"abstract":"This study investigates the prevalence and impacts of suspended atmospheric microplastics (SAMPs) in the coastal metropolitan city of Ningbo in the Yangtze River Delta Region, China. The sampling was conducted at both urban centre and urban-rural fringe areas, near the coast but distant from large urban populations. SAMP abundance ranged from 0.017 to 0.430 items m^-³, with an average of 0.145±0.09 items m⁻³. The urban centre exhibited approximately 70% more SAMPs than the urban-rural fringe, highlighting the influence of population density and human activity on microplastic pollution. Fibres dominated SAMP composition at both sites, while urban samples featured a greater variety of microplastic forms, such as fragments, beads, and films. Rayon and Polyethylene terephthalate were the predominant polymers, which were found to be directly related to local industrial activities. SAMPs ranged in size from 20 μm to 4,984.4 μm, with over 60% smaller than 1,000 μm. Seasonal variation followed a winter&gt;autumn&gt;spring&gt;summer pattern. Correlation and principal component analyses identified atmospheric temperature, pressure, wind speed, and rainfall as key factors influencing SAMP abundance. Notably, backward trajectory analysis showed that oceanic air masses carried significantly fewer SAMPs compared to terrestrial air, diluting concentrations in coastal regions. Annually, an estimated 4.67 × 10¹³ microplastics are suspended over Ningbo. This is the first comprehensive study of SAMP pollution in this region, revealing interactions between local sources, environmental variations, air mass dynamics, and exposure. The findings underscore the need for targeted strategies to mitigate atmospheric microplastic pollution in coastal urban environments.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"31 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867101","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":"The characteristics of phthalate acid esters and bisphenol A in PM2.5 of a petrochemical city: Concentrations, compositions, and health risk assessment in Dongying","authors":"Fangyun Long, Yanqin Ren, Yuanyuan Ji, Xurong Bai, Hong Li, Gehui Wang, Xiaoyu Yan, Yubao Chen, Junling Li, Haijie Zhang, Rui Gao, Fang Bi, Zhenhai Wu","doi":"10.1016/j.envpol.2024.125568","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125568","url":null,"abstract":"Phthalate acid esters (PAEs) and bisphenol A (BPA) are recognized as common endocrine disruptors associated with various adverse effects on human health. However, limitations in existing systematic studies, particularly in air detection, have raised concerns about potential health risks from inhalation exposure. In this study, PM_2.5 samples were collected in Dongying, a petrochemical city, from October 27 to December 6, 2021. The concentrations and compositions of PAEs and BPA in PM_2.5 were analyzed, and health risks associated with inhalation exposure were assessed. The hazard index (HI) and cancer risk (CR) were calculated according to EPA standard methods for both adults and children. The mean concentrations of PAEs and BPA were determined to be 1152 and 3.7 ng/m³, respectively. BPA concentrations were found to increase during heating, whereas PAE concentrations were observed to decrease slightly. Diisobutyl phthalate (DiBP), a major PAE, was reduced by approximately 20% during heating. However, 1,4-dimethylphthalazine (DMP) and bis(2-ethylhexyl) phthalate (DEHP) were observed to increase from 4.2 to 14% and from 5.9 to 11%, respectively. It is hypothesized that variations in the concentrations and compositions of airborne PAEs and BPA were influenced by district heating. An increase in the percentage of DEHP in PM_2.5 was noted on polluted days, likely influenced by saturated vapor pressure. The estimated daily intake (EDI) for children was calculated to be higher than that for adults, indicating that children were exposed to significantly greater potential risks, although overall risks were observed to be low. The results of this study provide essential baseline data, such as concentration, for the management and control of emerging pollutants like endocrine disruptors in the urban atmosphere.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"148 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867102","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":"Microplastics Aggravate the Adverse Effects of Methylmercury than Inorganic Mercury on Zebrafish (Danio rerio)","authors":"Yajie Lei, Xue Li, Xuefei Mao","doi":"10.1016/j.envpol.2024.125559","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125559","url":null,"abstract":"The potential health risks of microplastics (MPs) and their combined exposure with heavy metals such as mercury (Hg) in aquatic environment are increasingly concerned recently. In this work, zebrafish embryos were exposed to different levels of polystyrene microplastics (PS-MPs, ∼0.1 μm) coupled with Hg(II) or/and MeHg at 20 μg/L, to investigate the tissue biodistribution and accumulation of PS-MPs and Hg species, and their interaction, as well as embryo toxicity, oxidative stress and metabolic profiles. With zebrafish embryo development, PS-MPs were ingested and then primarily translocated to yolk sac, liver, and intestinal tissues, further acted as a significant vector for improving the bioaccumulation of MeHg vs. Hg(II). Whatever single or combined exposure of PS-MPs and Hg species, embryo disorders, such as delayed hatching, developmental abnormalities, and motor behavioral, and increased oxidative stress indications were obviously found. Herein, PS-MPs + MeHg aggravated oxidative stress compared with MeHg alone, which might been relevant to the highly accumulation of Hg level in zebrafish larvae induced by PS-MPs. Non-targeted metabolomics results proved PS-MPs involvement disturbed lipid metabolism, amino acid metabolism, and energy metabolism compared with alone Hg(II) or MeHg exposure, of which excessive energy metabolism by activating the glycolysis process was found in PS-MPs + MeHg treatment. This work reveals the enhancement efficacy of PS-MPs on MeHg induced toxicity and adverse stress, further proving the differentiated effect of elemental chemical forms with microplastics. In the future, elemental species must be considered for the combined toxicity evaluation and ecological risk assessments of microplastics and heavy metals.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"24 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867099","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":"Effect of Bisphenol F on Reproductive Function in F1 Generation Male Mice and its Potential Mechanisms","authors":"Bo Li, Siming Huo, Jiayu Du, Xuliang Zhang, Jian Zhang, Miao Song, Yanfei Li","doi":"10.1016/j.envpol.2024.125546","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125546","url":null,"abstract":"Bisphenol F (BPF) is an environmental endocrine disruptor capable of crossing the placental barrier and affecting the growth and development of offspring. Despite its potential impact, systematic research about effects of BPF on the reproductive function of male offspring remains limited. In this study, pregnant female mice were exposed to BPF at doses of 40, 400, and 4000 μg/kg during gestation and lactation, respectively, to evaluate its impact on testicular damage, testosterone levels, and spermatogenesis of male offspring (F1 generation), and further explore the mechanisms using transcriptomics. First, the study demonstrated that BPF induces testicular damage in F1 generation mice, leading to decreased testosterone levels and sperm quality. Second, transcriptomic analysis revealed that BPF affected spermatogenesis in F1 generation mice by disrupting retinol metabolism. Third, transcriptomic analysis revealed that BPF reduce the capacity for testosterone synthesis in F1 generation mice by diverting the testosterone precursor dehydroepiandrosterone (DHEA) towards the synthesis of 16α-hydroxydehydroepiandrosterone rather than testosterone. Finally, it was confirmed that BPF hinder cholesterol transport to mitochondria by inhibiting the cAMP signaling pathway, thereby impacting testosterone synthesis. In summary, the results of this study suggest that gestational exposure to BPF can lead to reproductive dysfunction in F1 generation male mice.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"97 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867100","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":"Epipelagic community as prominent biosensor for sub-micron and nanoparticles uptake: Insights from Field and Laboratory Experiments","authors":"Carola Murano, Tecla Bentivoglio, Serena Anselmi, Leonilde Roselli, Iole Di Capua, Monia Renzi, Antonio Terlizzi","doi":"10.1016/j.envpol.2024.125566","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125566","url":null,"abstract":"Nowadays, ENMs/NPLs particles have not yet been extensively measured in the environment, but there is increased concern that this size fraction may be more widely distributed and hazardous than larger-sized particles. This study aimed to examine the bioaccumulation potential of engineered nanomaterials and nanoplastics (ENMs/NPLs) across marine food webs, focusing on plankton communities and commercial fish species (<em>Engraulis encrasicolus</em> and <em>Scomber colias</em>) from the Gulf of Naples. Laboratory experiments on plankton assemblages exposed to fluorescent polystyrene nanoplastics (PS-NPs, 100 nm) for 24h at concentrations ranging from 0.01 to 10 mg/L confirmed nanoplastic uptake in phytoplankton and zooplankton, indicating a dose-dependent internalization in plankton communities. Notably, in natural samples no particles were detected in fish muscle or liver tissues, suggesting limited translocation. Unexpectedly, titanium oxide particles (&lt;1 μm) were found in natural phytoplankton, highlighting the potential presence of other nanoparticles in marine systems. These findings suggest that, despite detection challenges, plankton communities are major biosensors of ENMs/NPs contamination and highlight the need for ongoing environmental monitoring to assess ecological impacts and potential risks of nanoparticle bioaccumulation in marine ecosystems.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"20 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858000","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":"Corrigendum to ‘The protective roles of Oryza glumaepatula and phytohormone in enhancing rice tolerance to cadmium stress by regulating gene expression, morphological, physiological, and antioxidant defense system’ [Environ. Pollut. 364P1 (2024) 125311]","authors":"Humera Ashraf, Fozia Ghouri, Shafaqat Ali, Syed Asad Hussain Bukhari, Fasih Ullah Haider, Minghui Zhong, Weiwei Xia, Xuelin Fu, Muhammad Qasim Shahid","doi":"10.1016/j.envpol.2024.125532","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125532","url":null,"abstract":"The authors regret","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"4 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142848813","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":"Probing Methylmercury Photodegradation by Different Fractions of Natural Organic Matter in Water: Degradation Kinetics and Mercury Isotope Fractionation Characteristics","authors":"Lian Zhang, Qingliang Dai, Huaqing Liu, Yanbin Li, Yongguang Yin, Guangliang Liu, Peng Dai, Xiaoqiang Cao, Jian Zhang, Yong Cai","doi":"10.1016/j.envpol.2024.125563","DOIUrl":"https://doi.org/10.1016/j.envpol.2024.125563","url":null,"abstract":"Recent advancements in mercury (Hg) isotopic fractionation research have evolved from conceptual demonstrations to practical applications. However, few studies have focused on revealing fractionation fingerprinting for aqueous methylmercury (MeHg) photodegradation due to its sensitivity to natural organic matter (NOM). Here, the impact of NOM fractions with varying chemical properties on MeHg photodegradation kinetics and Hg isotope fractionation characteristics was investigated. Findings reveal that reduced NOM, containing alcohol/phenol groups, slows the degradation rate compared to the oxidized. Low-molecular-weight NOM, rich in thiol groups, enhances the degradation rate more effectively than high-molecular-weight counterparts. Hydrophilic/hydrophobic-acidic/basic NOM also significantly influence the rate constant, with the highest for hydrophilic-acidic NOM. Isotopic analysis showed that NOM's redox properties affect the extent and direction of Hg isotope fractionation. NOM with various molecular weights controls mass-dependent and mass-independent fractionation by regulating MeHg-NOM triplet radical pairs reactions, likely due to differences in functional groups. Similar effects were observed for different hydrophilic/hydrophobic-acidic/basic fractions. Further experiments with scavenger addition indicated that direct photodegradation of MeHg-NOM is a possible degradation mechanism, with free radicals/reactive oxygen species playing a minor role. These findings underscore the sensitivity of both the degradation rates and Hg isotope fingerprinting to different NOM fractions.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"17 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142857857","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}