Xiaodong Zhang, Jiawei Chen, Zhimeng Xu, Hongbin Liu
{"title":"Metabarcoding reveals high species diversity of Chaetoceros, Pseudo-nitzschia, and Thalassiosira in Hong Kong coastal waters, a typical subtropical region","authors":"Xiaodong Zhang, Jiawei Chen, Zhimeng Xu, Hongbin Liu","doi":"10.1016/j.marpolbul.2025.117549","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117549","url":null,"abstract":"<ce:italic>Chaetoceros</ce:italic>, <ce:italic>Pseudo-nitzschia</ce:italic>, and <ce:italic>Thalassiosira</ce:italic> are ecologically important genera which formed blooms frequently in Hong Kong coastal waters in past decades. However, species identification based on microscopic observation for diatoms in these genera is difficult. In this study, we investigated species diversity of <ce:italic>Chaetoceros</ce:italic>, <ce:italic>Pseudo-nitzschia</ce:italic>, and <ce:italic>Thalassiosira</ce:italic> in Hong Kong coastal waters using metabarcoding approach. Based on the analysis of SSU rRNA gene (Small subunit of ribosome), LSU rRNA gene (Large subunit of ribosome), and ITS region (Internal transcribed spacer), ITS region was the best gene marker for <ce:italic>Pseudo-nitzschia</ce:italic> while LSU rRNA gene was better to reveal the species diversity of <ce:italic>Chaetoceros</ce:italic> and <ce:italic>Thalassiosira</ce:italic> than other two gene markers. We detected seventeen, thirteen, and seventeen species of <ce:italic>Chaetoceros</ce:italic>, <ce:italic>Pseudo-nitzschia</ce:italic>, and <ce:italic>Thalassiosira</ce:italic>, respectively, in Hong Kong coastal waters. Twelve <ce:italic>Chaetoceros</ce:italic> species, six <ce:italic>Pseudo-nitzschia</ce:italic> species, and five <ce:italic>Thalassiosira</ce:italic> species were recorded for the first time in this study. Taking consideration of previous studies together, there are at least 31, 22 and 38 species of <ce:italic>Chaetoceros</ce:italic>, <ce:italic>Pseudo-nitzschia</ce:italic>, and <ce:italic>Thalassiosira</ce:italic> in Hong Kong coastal waters. In addition, according to previous studies and local records, multiple species of three genera were capable to form blooms and ten <ce:italic>Pseudo-nitzschia</ce:italic> species were potentially toxic. The bloom-forming species <ce:italic>C. tenuissimus</ce:italic>, <ce:italic>P. micropora</ce:italic>, <ce:italic>P. cuspidata</ce:italic>, and <ce:italic>T. lundiana</ce:italic> as well as non-bloom forming species <ce:italic>T. tenera</ce:italic> were the main dominant species. The remarkably high abundance of <ce:italic>Pseudo-nitzschia</ce:italic> in summer was potentially mainly contributed by the <ce:italic>P. cuspidata</ce:italic>, which is capable to produce domoic acid locally.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"74 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990401","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}
Loris Calgaro, Martina Cecchetto, Elisa Giubilato, Jukka-Pekka Jalkanen, Elisa Majamäki, Erik Ytreberg, Ida-Maja Hassellöv, Erik Fridell, Elena Semenzin, Antonio Marcomini
{"title":"The contribution of shipping to the emission of water and air pollutants in the northern Adriatic Sea - current and future scenarios","authors":"Loris Calgaro, Martina Cecchetto, Elisa Giubilato, Jukka-Pekka Jalkanen, Elisa Majamäki, Erik Ytreberg, Ida-Maja Hassellöv, Erik Fridell, Elena Semenzin, Antonio Marcomini","doi":"10.1016/j.marpolbul.2025.117573","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117573","url":null,"abstract":"Marine pollution management requires identifying all sources of contaminants, yet shipping's role in marine contamination remains unexplored. To address this gap, we investigated shipping contribution to water and air pollutant loads in the Northern Adriatic Sea in 2018 and under two future scenarios. The approach integrated (i) modelled data of shipping-related emissions, (ii) load from tributaries, and (iii) land-based emissions to the atmosphere. The results showed that shipping significantly contributes to copper, zinc (from antifouling paints), nitrogen (from sewage and food waste), phenanthrene, and naphthalene (from scrubbers and bilge water) loads. Under an increased shipping traffic scenario by 2050, scrubber use reduces atmospheric emissions but increases water pollutants, while alternative fuels reduce air contaminants emission with no significant increase in water pollution. This study sets the foundation to apply water and air quality models to identify areas of concern and assess the environmental impacts of future shipping emission control strategies.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"37 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990362","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}
Pauleanne B. Nacario, Philippe Anthony M. Alfafara, Nelle Andrian M. Ceniza, Eugene T. Bacolod, Maria Kristina O. Paler, Maria Ligaya S. Suico, Noel Peter B. Tan, Lorenz Inri C. Banabatac
{"title":"Uptake, growth, and oxidative stress responses of Rhizophora mucronata (Poir. in Lam.) propagules exposed to high-density polyethylene microplastics","authors":"Pauleanne B. Nacario, Philippe Anthony M. Alfafara, Nelle Andrian M. Ceniza, Eugene T. Bacolod, Maria Kristina O. Paler, Maria Ligaya S. Suico, Noel Peter B. Tan, Lorenz Inri C. Banabatac","doi":"10.1016/j.marpolbul.2025.117569","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117569","url":null,"abstract":"The plastic revolution's contribution to global pollution gives rise to microplastics (MPs), bearing a toll on the marine environment. Knowledge of mangrove exposure to MPs causing adverse effects has yet to be elucidated. Hence, the physiological responses of <ce:italic>R. mucronata</ce:italic> propagules exposed to ubiquitous High-Density Polyethylene Microplastics (HDPE-MPs) were investigated. The set-up consists of a control (0 mg/L) and an environmentally relevant treatment group (32.65 mg/L), acclimatized and exposed for three months. Scanning Electron Microscopy (SEM) shows agglomeration of HDPE-MPs on root surfaces and translocation to the shoot system of smaller MPs (< 50 μm). Attenuated Total Reflectance Fourier Transform-Infrared Spectroscopy (ATR FT-IR) confirmed uptake in the roots. Root length, count, plant height, foliar area, and oxidative stress biomarkers (carbonyl protein and total chlorophyll) all show significant differences (<ce:italic>p</ce:italic> < 0.05). Indeed, plastic pollution has detrimental effects on mangroves that may consequently affect mangrove forest diversity and productivity.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"8 1","pages":"117569"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990403","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}
Jonathan Tempesti, Joachim Langeneck, Luigi Romani, Marie Garrido, Claudio Lardicci, Ferruccio Maltagliati, Alberto Castelli
{"title":"Spatial variability and context-dependence of fouling communities in recreational marinas: A study in the Western Mediterranean with a focus on non-indigenous species (NIS)","authors":"Jonathan Tempesti, Joachim Langeneck, Luigi Romani, Marie Garrido, Claudio Lardicci, Ferruccio Maltagliati, Alberto Castelli","doi":"10.1016/j.marpolbul.2025.117558","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117558","url":null,"abstract":"Fouling communities were studied in twenty-six recreational marinas located along the continental and island coasts of Tuscany as well as Corsica (Western Mediterranean), focusing on the occurrence of non-indigenous species (NIS), in order to assess the variability of these assemblages at different spatial scales. Among the 560 taxa identified, 32 were alien or cryptogenic, with six new records for the study area. Results of this survey showed remarkable spatial variability of fouling community structure and NIS assemblage <ce:italic>i</ce:italic>) between marinas located on the mainland with respect to those on the islands (sectors), <ce:italic>ii</ce:italic>) among marinas within the same sector, and <ce:italic>iii</ce:italic>) among areas within the most of marinas. Macroalgae resulted the main drivers for the associated community, especially NIS, with variability level depending on different contexts. The high spatial variability observed suggests context-dependent fouling dynamics, where unique local conditions shape the structure of these communities and NIS occurrence.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"6 1","pages":"117558"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990410","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":"Introducing PES porous membrane to establish bionic autocrine channels: A lubricating, anti-wear antifouling coating","authors":"Rui Zhao, Jine Wang, Zhe Cheng, Lianglong Zou, Meihua Jin, Jiujun Xu","doi":"10.1016/j.marpolbul.2025.117556","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117556","url":null,"abstract":"As a global challenge, marine biofouling is causing serious economic losses and adverse ecological impacts. In recent years, a variety of promising and environmentally friendly anti-fouling strategies have emerged, among which the excellent anti-fouling performance of bionic autocrine coatings has been recognized. However, bionic autocrine coatings still suffer from uncontrollable secretion behavior, poor mechanical stability, and poor abrasion resistance. Inspired from dolphin skin, this study establishes an antifouling system i-PDMS/PES coating with lubrication based on secretion channels and resistance to abrasion properties by coupling a polyethersulfone (PES) porous membrane to the surface of secretion substance- silicone oil-infused polydimethylsiloxane (PDMS) pre-polymer coating. The secretion behavior of the secreted substances on the coating surface, the tribological properties of the coating surface, and the adhesion properties of marine bacteria and benthic diatoms were explored. The results showed that the secreted substances were rapidly secreted on the surface of the i-PDMS/PES coating to form a continuous lubricating film, and at the same time had an efficient self-replenishing ability, thus that not only effectively reduces the friction coefficient of the coating, but also mitigates the mechanical damage of the coating surface during friction. In additional, the continuous lubrication film formed by autocrine secretion improves the antifouling performance of the coating. Considering the actual application environment of antifouling coatings in the ocean, this study proposes a new solution to the problem of the long-term effectiveness of antifouling coatings.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"8 1","pages":"117556"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990445","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}
A. Da Fonseca Ferreira, A. Lehmann, T. Grard, R. Roquigny, C. Le Bris
{"title":"Genetic diversity and virulence gene profiling of Vibrio harveyi in a vibriosis-affected European seabass (Dicentrarchus labrax) aquaculture tank","authors":"A. Da Fonseca Ferreira, A. Lehmann, T. Grard, R. Roquigny, C. Le Bris","doi":"10.1016/j.marpolbul.2025.117553","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117553","url":null,"abstract":"Aquaculture is crucial for meeting global seafood demand; however, intensification often leads to the development of bacterial diseases that threaten productivity. <ce:italic>Dicentrarchus labrax</ce:italic>, a key species in European aquaculture, is highly vulnerable to vibriosis, primarily caused by <ce:italic>Vibrio harveyi</ce:italic>. This study investigates genetic diversity of <ce:italic>V. harveyi</ce:italic> isolates collected from a seabass tank affected by vibriosis. Sampling from biofilm and water environments yielded 946 bacterial isolates, of which 56 were identified as <ce:italic>V. harveyi</ce:italic> using MALDI-TOF MS. ERIC-PCR genotyping revealed four distinct profiles. Despite observing variability in the presence of the 80 virulence genes tested, the overall genetic variation among these profiles was not pronounced. The aim of this study was to determine if the presence of any <ce:italic>V. harveyi</ce:italic> environmental genotype profile could be used as an early predictor of vibriosis outbreak. Notably, no single environmental genotypic profile was linked to this latter. These findings suggest that the presence of virulence genes alone may not predict disease outbreaks, thus underscoring the need for future research on environmental and transcriptional factors that influences the virulence and pathogenicity to improve disease control in aquaculture systems.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"23 1","pages":"117553"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990446","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}
Zhe Zhang, Chenyi Liu, Lixin Yi, Hongwei Ren, Shucheng Li, Nan Liu, Lu Ren, Jian Liu, Ruotong Li, Yingchun Dong
{"title":"Hydrochemical fingerprints and health risk assessment of groundwater contamination in the Bohai Sea region, China","authors":"Zhe Zhang, Chenyi Liu, Lixin Yi, Hongwei Ren, Shucheng Li, Nan Liu, Lu Ren, Jian Liu, Ruotong Li, Yingchun Dong","doi":"10.1016/j.marpolbul.2025.117559","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117559","url":null,"abstract":"Seawater intrusion and human activities have significantly impacted coastal groundwater quality in many regions worldwide. This study systematically assessed groundwater chemistry, its suitability for drinking and irrigation (sample size, n = 3034), and exposure risks (n = 2863) across three key sub-regions of the Bohai Sea area: Bohai Bay, Liaodong Bay, and Laizhou Bay. Significant seasonal variations observed in groundwater chemistry at different depths in Bohai Bay region, with severe contamination from salinity-alkalinity and nitrogen-fluoride. SO₄-Cl-Na type groundwater predominates in Bohai Bay and Laizhou Bay areas, primarily influenced by evaporation dissolution and seawater mixing, while carbonate weathering and reverse ion exchange play secondary roles. In the Liaodong Bay region, SO₄-Cl-Ca-Mg water is dominant, driven primarily by carbonate weathering and reverse ion exchange. Groundwater evolution over time follows a complex sequence: Bohai Bay (mainly freshening) < Liaodong Bay (freshening > intrusion) < Laizhou Bay (freshening ≈ intrusion). Groundwater in the Bohai Sea region exhibits high sodium percentage, sodium adsorption ratio, total hardness, corrosion ratio, and residual sodium carbonate, with exceedance levels ranked as Bohai Bay > Laizhou Bay > Liaodong Bay, while irrigation efficiency follows the opposite trend. Fluoride, nitrogen, and bromine contamination pose significant health risks, particularly to children, and are likely linked to both anthropogenic interventions (such as industrial layout) and natural (geological) factors. Diseases types and incidence rates among residents closely correlate with groundwater pollutant levels, emphasizing the need for targeted pollution reduction and dynamic management strategies.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"31 1","pages":"117559"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990409","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}
Fanny Rioual, Jonathan Flye-Sainte-Marie, David Point, François Colas, Tomasa Cuellar-Martinez, Jorge Tam, Kevin Diaz, Wilson Carhuapoma, Michelle Graco, Fred Jean, Arturo Aguirre-Velarde
{"title":"Sulfides as environmental stressors in Paracas Bay, Peru","authors":"Fanny Rioual, Jonathan Flye-Sainte-Marie, David Point, François Colas, Tomasa Cuellar-Martinez, Jorge Tam, Kevin Diaz, Wilson Carhuapoma, Michelle Graco, Fred Jean, Arturo Aguirre-Velarde","doi":"10.1016/j.marpolbul.2025.117550","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117550","url":null,"abstract":"Paracas Bay, located in the Humboldt Current system, is a highly variable coastal environment where hypoxia (dissolved oxygen concentrations <2 mg L<ce:sup loc=\"post\">−1</ce:sup>) has been reported as a persistent feature of bottom conditions. In addition to hypoxia, milky water events have been reported in the bay, most likely associated with the presence of sulfides (<ce:italic>i.e.</ce:italic> sulfidic events), including toxic hydrogen sulfide (H<ce:inf loc=\"post\">2</ce:inf>S). This study is the first report of sulfide concentrations in the water column of Paracas Bay, with concentrations up to 6.79 μmol L<ce:sup loc=\"post\">−1</ce:sup> measured in the bottom water layer using Diffusive Gradient in Thin film (DGT) passive samplers. Sulfides showed a marked seasonal pattern, while ENSO phases did not seem to affect their occurrence. The presence of sulfides in the water column is closely linked to hypoxic conditions. Indeed, the analysis of the relationship between the duration of severe bottom hypoxia (dissolved oxygen ≤0.15 mg L<ce:sup loc=\"post\">−1</ce:sup>) and sulfides concentrations revealed a threshold of 18 h for sulfides accumulation in the overlying waters. Also, a gradient in sulfides concentration was observed from the sediment to the upper water layer. This gradient coupled with the variability of environmental variables (temperature, dissolved oxygen and currents velocity) highlights the complexity of this system, and suggests that a combination of advective and local physical and biogeochemical processes are responsible for the sulfidic events to occur in Paracas Bay. This study provides a baseline for assessing the potential toxicity of sulfides to cultured Peruvian scallops in upwelling bays.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"67 1","pages":"117550"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990444","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}
Mark June S. Consigna, Li-Chun Tseng, Chi Chou, Ching-Wen Huang, Yi-Ta Shao, Jiang-Shiou Hwang
{"title":"Pathological and biochemical effects of polyethylene microplastic exposure in hydrothermal vent crab, Xenograpsus testudinatus","authors":"Mark June S. Consigna, Li-Chun Tseng, Chi Chou, Ching-Wen Huang, Yi-Ta Shao, Jiang-Shiou Hwang","doi":"10.1016/j.marpolbul.2025.117546","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117546","url":null,"abstract":"Microplastic pollution significantly threatens marine ecosystems, including those with unique adaptations. This study evaluates the implications of polyethylene microplastics (PE-MPs) on the hydrothermal vent crab, <ce:italic>Xenograpsus testudinatus</ce:italic>. Crabs were exposed to varying fluorescent green polyethylene microspheres (FGPE) concentrations for 7 days. Histological analysis revealed severe damage to the hepatopancreas and gills at higher FGPE concentrations. Antioxidant enzyme activities (SOD, CAT, GR, GST, GPx, LPO) and gene expression (<ce:italic>sod</ce:italic>, <ce:italic>cat</ce:italic>) were assessed to evaluate oxidative stress responses. Results indicated significant upregulation of SOD and CAT activities at lower FGPE concentrations, suggesting an initial antioxidant response. However, GR and GST activities were inhibited at higher concentrations, and oxidative stress markers increased. These findings proved that PE-MPs induce molecular oxidative damage and lead to possible oxidative responses. Despite their resilience to extreme environments, HV crabs are vulnerable to pollutant-induced stressors, which pose ecological risks to species interactions and population dynamics within vent ecosystems.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"31 1","pages":"117546"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990402","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":"An online segmented continuous flow analysis system for rapid determining chemical oxygen demand in seawater to assess organic pollution levels","authors":"Chengying Jiang, Rongfang Zhao, Lehui Song, Wenhai Wang, Longwen Fu, Chen Zhang, Xiyan Sun, Lingxin Chen","doi":"10.1016/j.marpolbul.2025.117547","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2025.117547","url":null,"abstract":"By integrating ultraviolet (UV) photocatalytic oxidation digestion with segmented continuous flow analysis technology, an online measurement method and analysis system for the alkaline chemical oxygen demand (COD<ce:inf loc=\"post\">Mn</ce:inf>) in seawater, based on the color-change reaction of potassium permanganate, has been established. This represents the first application of UV photocatalytic oxidation technology in the measurement of COD<ce:inf loc=\"post\">Mn</ce:inf> in seawater. The system effectively overcomes the limitations of high-temperature and high-pressure digestion methods employed in traditional COD<ce:inf loc=\"post\">Mn</ce:inf> analysis. The detection limit was 0.13 mg/L, the linear range was 0.00 mg/L ~ 4.60 mg/L, with a relative standard deviation of 2.30 % (<ce:italic>n</ce:italic> = 11), and recovery rates of 95.33 % ~ 109.50 %. Additionally, the system minimized interference from salinity, making it suitable for COD<ce:inf loc=\"post\">Mn</ce:inf> determination in seawater. Compared to the national standard method, the maximum average relative error was 0.042, lower than the conventional standard of 0.10, indicating high accuracy. The analysis of seawater samples from the Yangma Island area further confirmed the reliability of the system in practical testing and regional organic pollution assessment. The system demonstrated excellent anti-interference capabilities, rapid detection speed, and ease of operation, providing significant application potential in seawater COD<ce:inf loc=\"post\">Mn</ce:inf> measurement.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"31 1","pages":"117547"},"PeriodicalIF":5.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990450","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}