环境科学与技术Pub Date : 2025-09-18DOI: 10.1021/acs.est.5c08983
Mao Kuroda, , , Atsuhiko Isobe*, , , Keiichi Uchida, , , Ryuichi Hagita, , and , Satoru Hamada,
{"title":"Settling and Along-Isopycnal Subduction of Small Microplastics Into Subsurface Layers of the Western North Pacific Ocean","authors":"Mao Kuroda, , , Atsuhiko Isobe*, , , Keiichi Uchida, , , Ryuichi Hagita, , and , Satoru Hamada, ","doi":"10.1021/acs.est.5c08983","DOIUrl":"10.1021/acs.est.5c08983","url":null,"abstract":"<p >The vertical distribution of small microplastics (SMPs; 10–300 μm in size) and its relation to water masses were investigated through seawater sampling and hydrographic surveys from the sea surface to 1000 m in the North Pacific Ocean. The average ± standard deviation of SMP concentrations in 12 layers at four stations was 6910 ± 2620 particles m<sup>–3</sup>. Concentrations were high in isopycnal layers between potential densities of 23 and 25σ<sub>θ</sub> (100–300 m depths). Elevated concentrations were also frequently detected below the North Pacific Intermediate Water (NPIW), characterized by a salinity minimum around the 26.6–27.0σ<sub>θ</sub> (approximately 600 m depth) isopycnal layers. A simple modeling approach to reproduce the observed SMP distribution suggested two pathways for SMPs floating in surface convergence zones. One pathway is the weak settling of SMPs of which the density becomes close to neutral, causing the along-isopycnal subduction from isopycnal layers outcropping at the sea surface to subsurface layers above the NPIW. Therefore, the global inventory of weakly settling near-neutral SMPs is expected to be high in the subsurface layers. Meanwhile, the strong settling via biological processes causes the other pathway from the surface euphotic layer to deep layers that never outcrop at the sea surface.</p><p >Oceanic SMPs follow two pathways: along-isopycnal subduction into subsurface layers via weak settling and accumulation at bottom layers via strong settling.</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20716–20725"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acs.est.5c08983","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Critical Role of Land Management Practices in Augmenting China’s Terrestrial Carbon Sink up to 2060","authors":"Mengyang Xu, , , Pengyi Zhang, , , Junhao He*, , , Chao Yue*, , , Ziyu Zhang, , , Qi Tian, , , Feilong Shen, , , Zhongdian Zhang, , , Jie Zhao, , , Mengyu Wang, , , Lei Zhu, , , Yi Leng, , , Jiasheng Li, , and , Lele Wang, ","doi":"10.1021/acs.est.5c03106","DOIUrl":"10.1021/acs.est.5c03106","url":null,"abstract":"<p >China’s carbon neutrality goal hinges on augmenting its terrestrial carbon sink through land management practices and environmental changes. However, the magnitude of China’s future terrestrial carbon sink and its contributing factors remain uncertain. Notably, there is a lack of appropriate tools to parse the contributions of individual land management practices (i.e., afforestation/reforestation, grassland grazing exclusion, and wood extraction) to China’s future terrestrial carbon sink. Employing a process-based model, this study projected an increment of 84.8 Tg C yr<sup>–1</sup> in China’s terrestrial carbon sink for 2021–2060 under the SSP1–2.6 scenario relative to the 2020 baseline of 224.1 Tg C yr<sup>–1</sup>. Land management practices, including afforestation and reforestation, reduced wood extraction, and grazing exclusion, were responsible for 96.8% of this increment, while environmental changes accounted for only 3.2% of this increment, with climate change nearly fully offsetting the contribution from atmospheric CO<sub>2</sub> growth. China’s terrestrial carbon sinks were estimated to range from 289.8 to 339.8 Tg C yr<sup>–1</sup> during 2021–2060 under different land management practices and environmental conditions. These findings highlight the dominant role of land management practices in augmenting carbon sequestration and provide critical insights for developing climate policies that support China’s carbon neutrality goals.</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20429–20441"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Harnessing Fe–Mo Atomic Interfaces for Boosted Electron Transfer and ROS Generation in Sustainable Pollutant Degradation","authors":"Lihong Liang, Jiazhen Cao, Zhuan Chen, Zhiyan Liang, Yue Jiang, Mingyang Xing","doi":"10.1021/acs.est.5c06307","DOIUrl":"https://doi.org/10.1021/acs.est.5c06307","url":null,"abstract":"Developing efficient and sustainable catalytic systems for persistent organic pollutant degradation remains a critical challenge in wastewater treatment. Herein, we present a novel FeMo<sub>0.5</sub>-OCN catalyst integrating iron clusters and molybdenum single atoms with oxygen coordination, which synergistically activates peroxymonosulfate (PMS) to generate reactive oxygen species (ROS), including sulfate radicals (SO<sub>4</sub><sup>•–</sup>) and singlet oxygen (<sup>1</sup>O<sub>2</sub>), for enhanced pollutant degradation. Density functional theory (DFT) calculations and experimental studies reveal that Mo single atoms facilitate pollutant adsorption via oxygen coordination, while Fe clusters drive PMS activation, enabling efficient electron transfer and ROS generation. The FeMo<sub>0.5</sub>-OCN/PMS system achieves rapid degradation (>90% within 1 min) and high mineralization (73% TOC removal) of phenol, along with robust stability over 30 reaction cycles and broad pH adaptability (pH 2–11). Apart from phenol, this system demonstrates outstanding degradation efficiency for other phenolic contaminants as well. The practical applicability of the system is demonstrated by chemical oxygen demand (COD) removal efficiencies of 91, 44, and 33% for phenolic, high-salinity, and alcohol-containing wastewaters, respectively, outperforming conventional Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> systems and activated carbon treatments. Heterogeneous catalytic model quantifies the contribution of ROS and the mass transfer behaviors of pollutants at the solid–liquid interface. Sensitivity analysis confirms that the <sup>1</sup>O<sub>2</sub>-facilitated generation of p-benzoquinone (p-BQ) is the rate-determining step in the overall reaction pathway. Life cycle assessment (LCA) confirms the system’s superior environmental sustainability and cost-effectiveness compared to conventional Fenton systems (Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> and Fe<sup>2+</sup>/PMS), with minimal metal leaching. This work highlights the critical role of interfacial electronic interactions in catalytic design and provides a scalable strategy for durable, eco-friendly wastewater remediation.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"11 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Rapid Visible Light-Driven Water Disinfection with CTAB-Modified UiO-66-NH2","authors":"Haibei Li, , , Mengqiu Chen, , , Yue Zhao, , , Tangping Zhang, , , Xinmei Li, , , Tianjiao Chen, , , Shuqing Zhou, , , Danyang Shi, , , Zhongwei Yang, , , Dong Yang, , , Junwen Li, , and , Min Jin*, ","doi":"10.1021/acs.est.5c02662","DOIUrl":"10.1021/acs.est.5c02662","url":null,"abstract":"<p >Water is the most essential resource for life, hence ensuring its universal availability in a rapid and reliable manner is highly desirable. Visible light-based catalytic disinfection is gaining prominence due to its accessibility and exceptional energy efficiency. In this study, we demonstrated that cetyltrimethylammonium bromide (CTAB)-modified UiO-66-NH<sub>2</sub> (CTAB@UiO-66-NH<sub>2</sub>) effectively harnesses visible light to achieve highly efficient water disinfection. Introducing CTAB into these nanosystems reduced the charge-transfer resistance and facilitated charge separation, enabling efficient generation of reactive oxygen species and ultimately enhancing photocatalytic activity. CTAB@UiO-66-NH<sub>2</sub> demonstrated outstanding water disinfection, achieving approximately 6–7 log inactivation of a broad spectrum of bacteria within 20 min under simulated visible light. It also exhibited stable cyclic disinfection performance and good biocompatibility, highlighting broad application prospects. Furthermore, CTAB@UiO-66-NH<sub>2</sub> showed promising disinfection performance in real river water, achieving a 2.5 log colony-forming unit reduction of bacteria in Haihe River samples within 20 min of visible light irradiation. Therefore, our study offers a simple and affordable path to rapid access to safe water.</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20143–20155"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Boosting the Low-Temperature CO Oxidation Activity of CeO2 via Photodirected Migration of Au Single Atoms","authors":"Xiaoqiang An, , , Jian Xu, , , Huachun Lan, , , Wenxuan Zhang, , , Zhongwei Liu*, , , Qiang Chen, , and , Jiuhui Qu*, ","doi":"10.1021/acs.est.5c06135","DOIUrl":"10.1021/acs.est.5c06135","url":null,"abstract":"<p >Single-atom catalysts (SACs) represent a promising solution for maximizing active-site utilization in exhaust gas elimination, yet the restricted functionality of isolated sites in competitive reaction kinetics often limits their performance. In this study, we present a photomediated strategy for the dynamic assembly of multifarious active sites on faceted CeO<sub>2</sub>. Combined experimental and theoretical analyses reveal that light-induced migration of Au atoms on 111-CeO<sub>2</sub> transforms neighboring isolated Au atoms into nanoclusters, concurrently activating lattice oxygen near Au single atoms and molecular oxygen around Au nanoclusters. The dual active centers synergistically facilitate CO adsorption and oxygen dissociation of CO, enabling efficient room-temperature CO oxidation through a dual-path mechanism. The photoreconstructed active sites on 111-CeO<sub>2</sub> exhibit remarkable catalytic performance, demonstrating 4-fold and 45-fold enhancement in reaction kinetics compared to conventional 111-CeO<sub>2</sub>- and 100-CeO<sub>2</sub>-based SACs, respectively, while surpassing state-of-the-art CO oxidation catalysts. This work provides atomic-level insights into metal–support interactions and establishes a novel approach for designing high-performance SACs for environmental catalysis.</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20367–20376"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
环境科学与技术Pub Date : 2025-09-18DOI: 10.1021/acs.est.5c06261
Wang Liu, Xiang-sheng Hong, Zhi-tong Li, Le Zhang, Juan Wang, Sai-hong Yan, Jin-miao Zha
{"title":"Intracranial Hemorrhage in Zebrafish: An Adverse Outcome Induced by Lovastatin","authors":"Wang Liu, Xiang-sheng Hong, Zhi-tong Li, Le Zhang, Juan Wang, Sai-hong Yan, Jin-miao Zha","doi":"10.1021/acs.est.5c06261","DOIUrl":"https://doi.org/10.1021/acs.est.5c06261","url":null,"abstract":"Statins are one of the most commonly prescribed medications in the world, used in the treatment of hypercholesterolemia, and consequently, statin residues in aquatic environments can pose a potential risk to nontarget organisms. Here, we show that lovastatin causes a significant increase of intracranial hemorrhage (ICH, ∼60% at 1 μg/L) and subsequent chronic lethality (>70% at 1 μg/L) at low concentrations (0.5–1 μg/L) in larval zebrafish. Over 50% of the ICH larvae recovered late in development, yet serious cerebrovascular injury (decreased total vessel length, number of junctions, and end points) and locomotive inhibition persisted. Transcriptional responses indicated significant alterations in tight junctions, neurotrophic, and pro-inflammatory factors. Notably, intervention to restore prenylation but not cholesterol biosynthesis almost completely blocks the occurrence of ICH, with larvae survival rates reaching 60%. Thus, our results show that lipid-regulating agents in aquatic environments can weaken fish cerebrovascular systems and cause chronic lethality that should not be overlooked.","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"38 1","pages":""},"PeriodicalIF":9.028,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
环境科学与技术Pub Date : 2025-09-18DOI: 10.1021/acs.est.5c03851
Mong Sin Christine Wu, , , Jacob T. Schmidt, , , Hailie E. Kittner, , , , and , David L. Valentine*,
{"title":"Geospatial and Temporal Inventory for Industrial DDT Waste Disposal to a Deep Coastal Ocean Environment","authors":"Mong Sin Christine Wu, , , Jacob T. Schmidt, , , Hailie E. Kittner, , , , and , David L. Valentine*, ","doi":"10.1021/acs.est.5c03851","DOIUrl":"10.1021/acs.est.5c03851","url":null,"abstract":"<p >Historical ocean disposal of industrial DDT (dichloro-diphenyl-trichloroethane) waste off Southern California is implicated in extensive ecological impacts extending well beyond this region, but details around disposal, transport, and fate are poorly characterized for deep ocean settings such as this. Here, we present results from an 814 km<sup>2</sup> survey of a primary disposal area, San Pedro Basin, by mapping the spatial distribution and depositional history of DDT and its immediate daughter products DDD (dichloro-diphenyl-dichloroethane) and DDE (dichloro-diphenyl-dichloroethylene). We find highly elevated concentrations for all three compounds throughout the study area, with “hotspots” from primary deposition and secondary migration processes. The majority of DDT and DDD is buried within a thin sediment layer consistent with peak deposition in the 1950s, whereas substantial amounts of DDE still linger in overlying sediments with an apparent contribution from the Palos Verdes Shelf. We characterize intense spatial variability across distance scales and develop an approach to address the resulting uncertainty toward estimating a total modern burden of ∼30–36 tonnes (DDT, DDD and DDE) in this area. These results are foundational for informing DDT’s deep-sea transport and transformation processes and for defining the linkage of offshore disposal to current ecological problems in this region and beyond.</p><p >This work informs transport and fate of chlorinated petrochemical waste in the deep-sea environment with implications for ecosystem health.</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20578–20587"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acs.est.5c03851","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
环境科学与技术Pub Date : 2025-09-18DOI: 10.1021/acs.est.5c02019
Linia Tashmim*, , , William C. Porter*, , , Timothy H. Bertram, , , Delaney B. Kilgour, , and , Andrew Rollins,
{"title":"Global Impacts of Marine Methanethiol Emissions and Chemistry in the Atmosphere","authors":"Linia Tashmim*, , , William C. Porter*, , , Timothy H. Bertram, , , Delaney B. Kilgour, , and , Andrew Rollins, ","doi":"10.1021/acs.est.5c02019","DOIUrl":"10.1021/acs.est.5c02019","url":null,"abstract":"<p >Oceanic emissions of dimethyl sulfide (DMS) have long been known to influence aerosol particle composition, cloud condensation nuclei (CCN) concentration, and Earth’s radiative budget. However, the impact of oceanic emissions of methanethiol (MeSH), a sulfur compound produced by the same oceanic precursor as DMS, has been relatively less explored. The gas-phase oxidation of MeSH has a higher effective yield of SO<sub>2</sub> and a shorter oxidative lifetime compared to DMS, highlighting the relevance of this pathway for the modeled representation of particle formation, growth, and CCN abundance in the marine atmosphere. Here, we use the global chemical transport model GEOS-Chem to explore possible scenarios representative of specific environmental conditions and MeSH emission schemes based on previous experimental studies. We further implement and test previously reported chemical mechanisms for MeSH oxidation, along with additional improvements, highlighting key uncertainties and sensitivities for regional and global sulfur budgets. We place our results in the context of recent modeling updates to DMS chemistry and cloud processing, which further impact SO<sub>2</sub> production in the marine atmosphere in parallel with MeSH oxidation. Within the overall marine sulfur budget, our findings highlight that MeSH plays a significant role in SO<sub>2</sub> production in the marine atmosphere, contributing to regional surface layer concentration increases of up to 40–60%. These results point to the importance of MeSH for efforts aimed at improving the modeled representation of sulfur spatiotemporal patterns relevant to air quality predictions and climate impact assessments.</p><p >We emphasize the importance of MeSH emission and oxidation in global models to gain a more detailed understanding of marine sulfur chemistry and to reduce existing biases in key sulfur species, such as sulfur dioxide (SO<sub>2</sub>).</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20421–20428"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acs.est.5c02019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Oxygen Vacancies Engineering of Co3O4 to Modulate the Adjacent Environment: Boosted Singlet Oxygen Generation in Peroxymonosulfate-Mediated 2-Chlorophenol Degradation","authors":"Feng Wang, , , Yilong Zhou, , , Xiaole Weng, , , Li Wang, , , Shan Gao, , , Yemin Zhao, , , Wangcheng Zhan*, , , Yanglong Guo, , and , Qiguang Dai*, ","doi":"10.1021/acs.est.5c05705","DOIUrl":"10.1021/acs.est.5c05705","url":null,"abstract":"<p >Peroxymonosulfate-based advanced oxidation processes are promising for removing organic pollutants but precisely generating singlet oxygen (<sup>1</sup>O<sub>2</sub>) as nonradical reactive oxygen species is difficult. Herein, a porous Co<sub>3</sub>O<sub>4</sub> nanosheet was synthesized and further tailored by the bulk doping of Mn and the surface loading of Ru. The abundant oxygen vacancies (O<sub>v</sub>) could be created by the Mn doping and then facilitated the precise anchoring of Ru, which in turn contributed to the construction of the adjacent heteronuclear diatomic adsorbed sites (Co–O<sub>v</sub>–Ru). In the base MnCoO<sub><i>x</i></sub>/peroxymonosulfate (PMS) system, the electron transfer occurred between the ≡Co(III)–(O)OSO<sub>3</sub><sup>–</sup> complex and free HSO<sub>5</sub><sup>–</sup> to produce the O<sub>2</sub><sup>•–</sup> and subsequently the adjacent O<sub>2</sub><sup>•–</sup> trapped on the O<sub>v</sub> disproportionates into <sup>1</sup>O<sub>2</sub>, whereas the anchoring of Ru occupied the O<sub>v</sub> and high-selectively boosted the self-combined generation of <sup>1</sup>O<sub>2</sub> through the heteronuclear diatomic-adsorbed PMS (SO<sub>5</sub><sup>•–</sup>–Co–O<sub>v</sub>–Ru–SO<sub>5</sub><sup>•–</sup>). The optimized Ru/MnCoO<sub><i>x</i></sub> demonstrated wide pH adaptability, high efficiency, and salinity tolerance for the degradation of 2-chlorophenol, and it removes over 99% of contaminants in complex water matrices even after 36 h in fixed-bed operation. This work provided a new protocol for PMS activation through a distinctively structured and easily scaled Co<sub>3</sub>O<sub>4</sub>-based catalyst and contributed to understand the tuning generation of singlet oxygen and guide the design of metal oxide catalysts.</p>","PeriodicalId":36,"journal":{"name":"环境科学与技术","volume":"59 38","pages":"20792–20804"},"PeriodicalIF":11.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145084364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}