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Interlinked water and sediment microplastics in the Laizhou Bay of China

Journal of Oceanology and Limnology 2025年第2期43卷 446-458页

作者： Hong CHEN Fenghua JIANG Jingxi LI Wei CAO Di ZHANG Futao ZHANG Shiliang WANG Chengjun SUN College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Qingdao National Laboratory of Marine Science and Technology Laboratory of Marine Drugs and Biological ProductsQingdao 266071China

To explore the relationship of microplastic pollution in different media in marine environment,microplastics in the surface seawater and sediments of Laizhou Bay,Bohai Sea,North China,were *** samples were collected using a pre-concentrator equipped with a 20-μm mesh size sieve,and sediment samples were collected by a box *** shape,color,size,and type of microplastics were obtained by a stereomicroscope and a Fourier transform infrared spectrometer(ATR-μ-FT-IR).Results show that the abundance of microplastics in the surface seawater of Laizhou Bay was 858.3±573.2 items/m~3,and that of microplastics in sediments was 151.0±77.4 items/kg dry weight(d.w.)The microplastics in seawater and sediments were mainly ***,the microplastics in seawater were mainly transparent,and those in sediments were transparent and *** highest proportion of microplastics in seawater was rayon(77.48%),followed by polyethylene terephthalate(PET,13.17%).The highest proportion of microplastics in sediments was rayon(73.66%),followed by PET(8.90%).The size of microplastics in 1000-2000μm accounted for the largest proportion of 28.54%in seawater,while that in 500-1000μm took 27.93%in *** in seawater and sediment showed medium-level *** seawater,microplastic abundance was higher in offshore and nearshore areas of *** sediment,microplastic abundance was higher in offshore and nearshore areas of *** results of the principal component analysis(PCA)indicated that microplastics in sediment exhibited greater stability compared to those in *** microplastics in seawater and sediment show a positive correlation in terms of shape and plastic type,while exhibiting a negative correlation in terms of ***,microplastics in sediments were smaller in size,and those in seawater and sediments had consistent size distribution characteristics in space.

关键词： microplastic Laizhou Bay sediment seawater correlation

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Microplastic occurrence and hydrodynamic-sedimentary driving effects in the Bohai Strait region of China

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Science of the Total environment 2025年 958卷 177947页

作者： Zhou, Long Sun, Chengjun Li, Jingxi Zhao, Chang Ding, Jinfeng Cao, Wei Jiang, Fenghua Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao266590 China Key Laboratory of Marine Science and Numerical Modeling First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China

The ubiquity of microplastics in oceans has led to an increased interest in microplastics in society. The Bohai Strait is in a key position in the Yellow and Bohai Seas and plays a key role in the exchange of materials and environmental changes in these waters. In this study, seawater, surface sediments, and column sediments, were collected from the Bohai Strait region. Among all seawater samples, the abundance of microplastics in the Bohai Strait region ranged between 0.38 and 3.20 items/L, and that of microplastics in surface sediments was between 15.80 and 94.41 items/kg d.w. The average microplastics abundance in columnar sediments was 72.62 ± 29.86 items/kg d.w., which provided key information on the spatial distribution of microplastics and sedimentation phenomena in the Bohai Strait region. The abundance of microplastics was higher in regions where currents flowed more slowly, which suggests that ocean currents exert a crucial effect on microplastic distribution. In addition, the abundance of microplastics in sediments showed a close relation to the deposition rate, which implies that the deposition rate contribute to the deposition process of microplastics on the seafloor. The type of microplastics in seawater influences the kind of microplastics in sediments, which further emphasizes the importance of microplastics in seawater during microplastic transport and the deposition process. The results of this research contribute to the in-depth understanding of the behavior and propagation pathways of microplastics in oceans and provide a valuable reference for the reduction of microplastic pollution. © 2024

关键词： Deposition rates

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Superior peroxidase-like activities of InVO4 hollow nanocuboid assemblies for colorimetric detection of hydrogen peroxide and glucose

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Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy 2025年 338卷 126195页

作者： Chen, Juna Hu, Jingfei Chi, Jingtian Hou, Peng Zhang, Wanwan Jiang, Yishan Zhai, Xiaofan Ju, Peng Navy Submarine Academy No. 1 Jinshui Road Qingdao266199 China NICU Qingdao Women and Children's Hospital No. 6 Tongfu Road Qingdao266000 China Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation Marine Bioresource and Environment Research Center First Institute of Oceanography Ministry of Natural Resources No. 6 Xianxialing Road Qingdao266061 China Key Laboratory of Advanced Marine Materials CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of Oceanology Chinese Academy of Sciences No. 7 Nanhai Road Qingdao266071 China Institute of Marine Corrosion and Protection Guangxi Academy of Sciences No. 98 Dalin Road Nanning530007 China

In this work, InVO4 hollow nanocuboid assemblies (IVHNs) with larger specific surface area were synthesized by a facile one-pot hydrothermal method, which were utilized as artificial biomimetic catalysts. In the presence of hydrogen peroxide (H2O2), the IVHNs nanozyme enchantingly displayed an extraordinary peroxidase-like performance, inducing the oxidation of the chromogenic compound 3,3′,5,5′-tetramethylbenzidine (TMB) to generate a blue oxide. Kinetics analysis unequivocally demonstrated that the catalytic behavior of IVHNs conformed to the Michaelis-Menten mechanism, and ·O2− radicals played a vital role in the catalytic process according to the active species capture experiments. Given the exceptional catalytic performance of IVHNs, a colorimetric sensing platform was successfully established for rapid and accurate detection of H2O2 and glucose. The concentrations of H2O2 and glucose were positively correlated with the absorbance of TMB oxide in the linear ranges of 1–25 μM and 10–100 μM with the detection limit of 0.092 μM and 0.96 μM, respectively. Enriched by its exquisite stability, selectivity, and anti-interference ability, the colorimetric sensing system bestowed its success upon qualitative detection of H2O2 and glucose in real samples. This study not only unveils a novel nanozyme boasting remarkably efficient catalytic prowess, but also pioneers a rapid and straightforward approach for environmental analysis and clinical diagnosis. © 2025 Elsevier B.V.

关键词： Hydrogen peroxide

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Identification and preparation of debromination products of DBDPE photodegradation by HPLC-APPI-MS coupled to semi-preparative liquid chromatography

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Journal of environmental Sciences 2025年

作者： Dongjuan Zeng Wenrui Zhang Yongchao Lei Yanlong Wang Peng Liang Xuelong Lv Biao Kong Junhui Chen Zhenghao Xin College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao Shandong 266590 China College of Chemical and Biological Engineering Shandong University of Science and Technology Qingdao Shandong 266590 China Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation First Institute of Oceanography Ministry of Natural Resources Qingdao 266061 China

Decabromodiphenyl ethane (DBDPE) is widely used as an additive flame retardant and has led to global pollution. Its has a large molecular mass and is prone to debromination and degradation under photothermal conditions, resulting in smaller homologous compounds. Due to the lack of standard substances for debromination products, the in-depth study of DBDPE environmental geochemical behavior through debromination conversion has been hindered. Therefore, based on DBDPE photodegradation experiment, this study first analyzed and identified the brominated products of DBDPE using high-performance liquid chromatography-atmospheric pressure photoionization-time of flight mass spectrometry (HPLC-APPI-TOF/MS). Four debromination products-nonabromodiphenyl ethane (nona-BDPE), octabromodiphenyl ethane (octa-BDPE), heptabromodiphenyl ethane (hepta-BDPE) and hexabromodiphenyl ethane (hexa-BDPE) are identified based on the characteristic ion peak of [M-Br+O] - in negative ion mode. Subsequently, using methanol as the mobile phase, four debromination products of DBDPE were separated and purified with a semi-preparative high-performance liquid chromatography (SP-HPLC) system equipped with an Agilent Zorbax Eclipse PAH column (4.6 × 250 mm, 5 μm). The first-time acquisition of hexa-BDPE (60.00 μg), octa-BDPE (19.40 μg), hepta-BDPE (31.20 μg) and octa-BDPE (isomer, 45.20 μg) with purity exceeding 90 % has been achieved. Among them, the purity of one hepta-BDPE monomer is as high as 98.91 %. This study indicates that based on photodegradation experiments, the combination of HPLC-APPI-TOF/MS and SP-HPLC techniques can rapidly identify and prepare DBDPE debrominated products. This approach meets the requirements for preliminary research on the pollution characteristics of DBDPE debrominated compounds and offers a feasible solution for the preparation of standard reference materials for emerging pollutants.

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Occurrence,Spatial Distribution,Sources and Risk Assessment of Per-and Polyfluoroalkyl Substances in Surface Sediments of the Yellow River Delta Wetland

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Journal of Ocean University of China 2024年第5期23卷 1263-1274页

作者： SUN Yu SHEN Nan ZHANG Dahai CHEN Junhui HE Xiuping JI Yinli WANG Haiyang LI Xianguo Key Laboratory of Marine Chemistry Theory and Technology(Ocean University of China) Ministry of EducationQingdao 266100China Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation Qingdao 266061China The Yellow River Delta Sustainable Development Institute of Shandong Province Dongying 257100China

Per-and polyfluoroalkyl substances(PFASs)are emerging persistent organic pollutants(POPs).In this study,47 surface sediment samples were collected from the Yellow River Delta wetland(YRDW)to investigate the occurrence,spatial distribution,potential sources,and ecological risks of ***-three out of 26 targeted PFASs were detected in surface sediment samples from the YRDW,with totalΣ23PFASs concentrations ranging from 0.23 to 16.30 ng g^(-1) dw and a median value of 2.27 ng g^(-1) *** acid(PFOA),perfluorobutanoic acid(PFBA)and perfluorooctanesulfonic acid(PFOS)were the main *** detection frequency and concentration of perfluoroalkyl carboxylic acids(PFCAs)were higher than those of perfluoroal-kanesulfonic acids(PFSAs),while those of long-chain PFASs were higher than those of short-chain *** emerging PFASs substitutes were dominated by 6:2 chlorinated polyfluoroalkyl ether sulfonic acid(6:2 Cl-PFESA).The distribution of PFASs is significantly influenced by the total organic carbon content in the *** concentration of PFASs seems to be related to human activities,with high concentration levels of PFASs near locations such as beaches and *** using a positive matrix factorization model,the potential sources of PFASs in the region were identified as metal plating mist inhibitor and fluoropolymer manufacturing sources,metal plating industry and firefighting foam and textile treatment sources,and food packaging material *** risk assessment indicated that PFASs in YRDW sediments do not pose a significant ecological risk to benthic organisms in the region overall,but PFOA and PFOS exert a low to moderate risk at individual stations.

关键词： per-and polyfluoroalkyl substances Yellow River Delta wetland sediment source identification risk assessment

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Occurrence and phase distribution of lipophilic marine algal toxins in the bottom boundary layer and sediment-porewater system of two mariculture sites

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Chemosphere 2023年 341卷 140109页

作者： Sheng, Cancan He, Xiuping Shen, Nan Han, Tongzhu Chen, Junhui Liu, Chenguang Li, Xianguo Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao266100 China Key Laboratory of Marine Eco-Environmental Science and Technology The First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation Qingdao266061 China

To date, understanding the fate of lipophilic marine algal toxins (LMATs) in benthic environments on which cultivated shellfish depend is still limited. In this work, the occurrence, concentration levels, and phase distributions of LMATs in the benthic environments of two mariculture sites (Sishili and Rongcheng Bays) in China were investigated for the first time. Five LMATs: okadaic acid (OA), pectenotoxin-2 (PTX2), gymnodimine, 13-desmethyl spirolide C, and azaspiracid-2 (AZA2) and three derivatives: dinophysistoxin-1 isomer (DTX1-iso), pectenotoxin-2 seco acid, and 7-epi- pectenotoxin-2 seco acid were detected in different environmental samples. OA and PTX2 were the dominant LMATs in the bottom boundary layer (BBL) and sediment, whereas AZA2 was present in the sediment only. Notably, DTX1-iso was found for the first time to be widely distributed in the benthic environments of the bays. In BBL, the average proportion of LMATs in the dissolved phase (99.20%) was much higher than in the particulate phase (0.80%). Partition of LMATs was more balanced between sediment porewater (57.80% average proportion) and sediment (42.20%). The concentrations of ∑LMATs in the BBL seawater ranged from 19.09 ng/L to 41.57 ng/L (mean of 32.67 ng/L), and the spatial distribution trend was higher in offshore than nearshore. ∑LMATs concentrations in the sediment and porewater of the two bays ranged from 17.04 ng/kg to 150.13 ng/kg (mean of 53.58 ng/kg) and from 8.29 ng/L to 120.58 ng/L (mean of 46.63 ng/L), respectively. Their spatial distributions differed from those in BBL, showing a trend of high concentrations in areas with heavy land-based inputs. ∑LMATs concentrations in porewater were significantly higher than those in BBL seawaters, suggesting that the potential hazards of LMATs to benthic organisms may be underestimated. © 2023 Elsevier Ltd

关键词： Boundary layers

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Prevalence of Neurotoxin Domoic Acid in Aquatic environment of Bohai and Northern Yellow Seas in China

SSRN

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SSRN 2022年

作者： Chen, Junhui Yang, Jianbo He, Xiuping Wang, Jiuming Pan, Lei Xin, Ming Chen, Farong Liang, Shengkang Wang, Baodong Marine Bioresource and Environment Research Center Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China Qingdao266071 China Qingdao Key Laboratory of Analytical Technology Development and Standardization of Chinese Medicines Qingdao266590 China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao266100 China Tianjin University of Traditional Chinese Medicine China

Domoic acid (DA) is a natural marine phytotoxin produced by toxigenic algae, and has a latent harm to fishery organisms and the health of seafood eaters. In this study, the whole-sea area investigation of DA in seawater, suspended particulate matter and phytoplankton of the Bohai and Northern Yellow seas was performed, to clarify the occurrence, phase partitioning, spatial distribution, potential sources, and environmental influencing factors of DA in aquatic environment. DA in dissolved phase (DP) and particulate phase were confirmedly identified and determined by liquid chromatography-high resolution mass spectrometry and liquid chromatography-tandem mass spectrometry, and DA are predominantly partitioned into DP (99.84%) in seawater. Dissolved DA (dDA) was widely detected in nearshore and offshore areas of the Bohai, Northern Yellow seas, and Laizhou Bay, and their concentrations ranged from © 2022, The Authors. All rights reserved.

关键词： Phytoplankton

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