Article
Environmental Sciences
Pei Lei, Jinjie Zhu, Jin Zhang, Huan He, Mingying Chen, Huan Zhong
Summary: Algal organic matter (AOM) hinders the photodegradation of neurotoxic methylmercury (MeHg) in eutrophic lakes due to dynamic changes in AOM during algal decomposition. The inhibitory effect of AOM on MeHg photodegradation varies among lakes and their eutrophication states. Reactive oxygen species (ROS), including hydroxyl radical, singlet oxygen, and DOM-D-3*, play different roles in driving MeHg photodegradation throughout the algal decomposition process. This study highlights the importance of considering AOM-MeHg interactions in predicting MeHg risks and suggests integrating them into Hg biogeochemical cycling models.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Engineering, Environmental
Tantan Wang, Xu Yang, Zihao Li, Wenhao Chen, Xin Wen, Yubo He, Chi Ma, Zhongzhu Yang, Chang Zhang
Summary: This review summarizes the mechanisms by which eutrophication affects the production of methylmercury (MeHg), with a focus on the roles of algal organic matter (AOM) and iron (Fe)-sulfur (S)-phosphorus (P) dynamics. Suggestions for risk control of MeHg in eutrophic lakes are also proposed.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Stephanie M. Berg, Benjamin D. Peterson, Katherine D. McMahon, Christina K. Remucal
Summary: This study evaluates the composition of dissolved organic matter (DOM) in Lake Mendota as a function of time and depth. The researchers analyze dissolved organic carbon concentrations and optical properties of samples collected from June to November, and use Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) to investigate DOM composition at the molecular level. The results show that DOM composition varies both temporally and with depth, with photochemical reactions and redox conditions playing important roles. The findings have implications for understanding the flux of CO2 in lakes and the impact of lake eutrophication.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Environmental Sciences
Bo Shao, Zhike Li, Zhengyu Wu, Ning Yang, Xiaoyu Cui, Huiming Lin, Yiwen Liu, Wei He, Yingxin Zhao, Xuejun Wang, Yindong Tong
Summary: The bioaccumulation of MeHg in pelagic food webs is influenced by dissolved organic matter (DOM), with elevated concentrations of DOM and phytoplankton biomass affecting MeHg uptake by phytoplankton and resulting in more significant biomagnification in zooplankton.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Shuaidong Li, Jie Fang, Xinshu Zhu, Robert G. M. Spencer, Xose Anton Alvarez Salgado, Yongcui Deng, Tao Huang, Hao Yang, Changchun Huang
Summary: This study investigates the response of sediment dissolved organic matter (DOM) to eutrophication and its association with bacterial communities in Dianchi Lake, China. The results show that the composition and structure of sediment DOM are regulated by source transformation during eutrophication, and microbial communities play an important role in sediment biogeochemical processes.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geochemistry & Geophysics
Delphine Tisserand, Stephane Guedron, Eric Viollier, Didier Jezequel, Sylvain Rigaud, Sylvain Campillo, Geraldine Sarret, Laurent Charlet, Daniel Cossa
Summary: This study investigated the speciation and distribution of mercury (Hg) in Lake Pavin, France. The results showed that the cycling of Hg in the lake is controlled by biological activity, organic matter, iron, and sulfur. The study provides important insights into the understanding of Hg cycling in lakes.
APPLIED GEOCHEMISTRY
(2022)
Article
Biodiversity Conservation
Zheng Yin, Liqing Li, Chenyu Liu, Weijin Yan, Lai Wang, Meiyi Zhang, Dongsheng Wang
Summary: Understanding the source and historical variation of sedimentary organic matter and its relationship with human socio-economic activities is important for water resource management. This study collected sediment cores from different habitats in Baiyangdian Lake, China, and used Bayesian models and generalized additive models to analyze the sources and variations of sedimentary organic matter. The results showed that phytoplankton and soil organic matter were the main sources of sedimentary organic matter, and population and GDP were the main factors influencing their variations.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Xinli Xing, Weijie Liu, Peng Li, Yewang Su, Xingyu Li, Mingming Shi, Tianpeng Hu, Ya Zhang, Li Liu, Jiaquan Zhang, Shihua Qi
Summary: This study investigates the temporal patterns of polycyclic aromatic hydrocarbons (PAHs) in sediment cores and the effects of sedimentary organic matter (OM) and regional development model on PAHs. The results show that the growth of PAHs is mainly attributed to traffic emission, coal combustion, and biomass burning, and the eutrophication of lakes accelerates the burial of PAHs. The study highlights the importance of economic development models and the coupling relationship between OM burial and PAHs sedimentation.
ENVIRONMENTAL RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Yongdong Zhang, Huan Fu, Xiaoting Yang, Zhengwen Liu
Summary: Characterizing the input of organic matter (OM) in lake sediments and understanding its source and composition is crucial for studying the carbon cycle and burial in lake systems. This study analyzed stratigraphic variations in aliphatic hydrocarbons and OM pyrolysis parameters in Lake Chaohu sediments over the past 166 years to determine the pattern and controlling factors of OM input. The results indicate a minimal input of OM from phytoplankton and terrestrial plants before the 1950s, an increase in input from phytoplankton and terrestrial plant/fossil OM during the 1960s-1980s, and a further increase in input from phytoplankton after 1989 due to domestic and industrial discharge and lake eutrophication.
Article
Environmental Sciences
Chi Zhang, Wenjing Li, Wei Du, Bingshuai Cao, Wenlin Wang, Bo Pang, Huashan Dou, Wen Ao, Bo Liu, Shihao Yao
Summary: Dissolved organic matter (DOM) is the main carbon storage in freshwater lakes and plays a significant role in the carbon cycle. However, the sources and composition of DOM in steppe lakes are still poorly understood. This study used carbon/nitrogen ratios and 3D excitation-emission matrix (3DEEM) fluorescence spectroscopy to identify the sources and composition of DOM in Hulun Lake, a large shallow steppe lake. The results showed that terrigenous material is the major source of DOM in Lake Hulun. These findings highlight the need for more research on terrestrial inputs to steppe lakes.
Article
Engineering, Environmental
Musong Chen, Shiming Ding, Cai Li, Yazhou Tang, Xianfang Fan, Huacheng Xu, Daniel C. W. Tsang, Chaosheng Zhang
Summary: Eutrophication and metal pollution are global environmental issues. This study investigated the mobility of cadmium in sediments from Lake Taihu and found that the sudden outbreak of cadmium pollution in May and June was due to the complexation of dissolved organic matter with cadmium in sediments. The research highlights the risk of sudden cadmium pollution events in eutrophic lakes.
Article
Environmental Sciences
Jinglong Wang, Qinyi Chen, Shun Huang, Zhicong Wang, Dunhai Li
Summary: Phosphorus is a key nutrient in eutrophic lakes, and its concentrations in the water and sediments decrease with aggravated eutrophication. There is a significant negative correlation between phosphorus concentrations and eutrophication parameters. Cyanobacterial organic matter (COM) can alter sediment phosphorus release characteristics and stabilize phosphorus concentrations. Simulation experiments confirmed that COM can reduce sediment phosphorus content and promote its release, giving cyanobacteria a competitive advantage.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Yulai Wang, Wanqing Gu, Xin Liu, Hui Liu, Gui Tang, Changming Yang
Summary: This study investigated the combined impacts of algae bloom and its induced variations in heavy metals on microbial community in sediment from a eutrophic lake. The results showed that algae bloom increased the quantity of water soluble organic matter and redistributed the spatial patterns of heavy metals in sediment. The bloom also decreased the richness and diversity of sediment bacterial community, with the combined impacts of algae-induced changes explaining 66.56% of the variations in bacterial community structure.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Ecology
Xingyu Jiang, Guang Gao, Yang Hu, Keqiang Shao, Xiangming Tang, Hua Cheng, Jing Li
Summary: The study found that algal-derived POM can produce high-quality organic carbon, which is more conducive to DNRA. Moreover, the loss of macrophytes and increase in algal biomass may induce changes in autochthonous POM quality and potentially drive nitrogen recycling in eutrophic lakes.
FRESHWATER BIOLOGY
(2022)
Article
Microbiology
Vincent Tardy, David Etienne, Helene Masclaux, Valentin Essert, Laurent Millet, Valerie Verneaux, Emilie Lyautey
Summary: Bottom waters hypoxia in lakes can have severe consequences on lake trophic networks. In Lake Remoray, excess algal production was linked to nutrient runoff from the watershed. After a hypoxic event, sediment microbial communities exhibited distinct spatial patterns and variations in abundance of dominant microbial groups, providing valuable insights into areas affected by hypoxia. Additionally, the presence of methanogenic species in deep lake areas suggests significant methane production during hypoxic periods. Overall, this study offers a comprehensive understanding of microbial community distribution in relation to organic matter in a seasonally hypoxic lake.
FEMS MICROBIOLOGY ECOLOGY
(2021)
Article
Engineering, Environmental
Xue Cao, Zhao-Xuan Yu, Minwei Xie, Ke Pan, Qiao-Guo Tan
Summary: This study found that particulate metals in coastal waters play a significant role, but current water quality criteria focus mainly on dissolved metals and underestimate the contribution of particulate metals. A method was developed to assess the toxicity risk of particulate metals and calculate modifying factors for site-specific criteria in turbid waters. The study also revealed the important influence of particulate copper on bioaccumulation and toxicity. The application of modifying factors based on a toxicokinetic-toxicodynamic model allows for an accurate assessment of the toxicity risk of particulate copper.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Environmental Sciences
Pei Lei, Ri-Qing Yu, Yaqi Kong, Stefan Bertilsson, Martin Tsz-Ki Tsui, Tao Jiang, Jiating Zhao, Yu-Rong Liu, Rinklebe Joerg, Huan Zhong
Summary: Distinguishing the contributions of different microbes to methylmercury production is crucial for predicting bioaccumulation and exposure risk. However, there are several factors that can impact the interpretation of inhibition assays, including the addition of inappropriate amounts of inhibitors, overlooking microbial syntrophy, and the absence of comprehensive proxy systems. To improve the accuracy of inhibition assays, environmental properties and concentrations of inhibitors should be considered, and comprehensive indicators should be used to assess changes in methylmercury production.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Yanfei Zhou, Gang He, Hao Jiang, Ke Pan, Wenzhi Liu
Summary: The study found that nanoplastics have toxic effects on soil fauna (earthworms), including decreased antioxidant enzyme activity, accumulation of reactive oxygen species, reduced growth rate, and pathological abnormalities. These adverse effects are enhanced by positively charged nanoplastics. Moreover, the nanoplastics can enter earthworm cells and accumulate in lysosomes, leading to cellular death. These findings have important implications for assessing the ecological risk of nanoplastics.
ENVIRONMENT INTERNATIONAL
(2023)
Article
Engineering, Environmental
Wen-Bo Guo, Chao Wu, Ke Pan, Liuyan Yang, Ai-Jun Miao
Summary: This study investigated the effects of pre-exposure of Tetrahymena thermophila to Fe2O3 or TiO2 NPs on the subsequent uptake of 55Fe2O3 NPs. The results showed that pre-exposure to NPs inhibited the protozoan's uptake of 55Fe2O3 NPs by altering endocytosis-related organelles, inducing oxidative stress, and lowering the intracellular energy supply.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Fengyuan Chen, Jie Ma, Zihan Zhong, Hongbin Liu, Aijun Miao, Xiaoshan Zhu, Ke Pan
Summary: Marine diatoms are facing increasing threats from microplastic pollution, especially under disturbed nutrient stoichiometry in seawater. This study focuses on the effects of silicon limitation on the interactions between diatoms and pristine polystyrene microplastics. The results showed that Si-starved cells were less tolerant to microplastic toxicity due to changes in cell configuration and composition. These changes facilitated adsorption and aggregation between diatoms and microplastics, compromising diatoms' resistance. This study provides new insights into the effects of microplastics in dynamic nutrient conditions in the marine environment.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Wenjing Guo, Dong Zhang, Wenshi Zhang, Shen Li, Ke Pan, Hao Jiang, Quanfa Zhang
Summary: Urban rivers often have high nitrate (NO3-) loadings, which can cause water quality and ecological damages. The drivers of these high loadings have remained unclear. This study used natural-abundance isotopes and N-15-pairing techniques to reveal the anthropogenic impacts on NO3- pollution in an urban river for the first time. The study showed that soil sources and wastewater treatment plants were significant contributors to the high NO3- loadings.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Siqi Zhang, Yongguang Yin, Peijie Yang, Cong Yao, Shanyi Tian, Pei Lei, Tao Jiang, Dingyong Wang
Summary: This study investigated the impact of changes in DOM characteristics driven by end-member mixing on DOM biogeochemical reactivities. The results showed that the variations of DOM characteristics significantly affected its biogeochemical reactivities, but not all parameters and reactivities followed the conservative mixing behavior. Therefore, the effect of end-member mixing should be evaluated in the given reactivity instead of generalization.
Article
Chemistry, Analytical
Hangqian Li, Shulu Zheng, Qiao-Guo Tan, Liyang Zhan, Todd R. Martz, Jian Ma
Summary: This study presents a smartphone-based environmental analyzer (vSEA) for rapid measurement of seawater pH. By using a 3D-printed light-proof shell, the quality of captured images is guaranteed. The vSEA-pH system was successfully applied for on-site pH measurements in coastal seawater and coral systems, and its performance was validated against a benchtop spectrophotometer. The vSEA-pH system is compatible with different smartphone devices and can be widely used for citizen science-based data collection.
ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
Guogan Peng, Zhengshijian Pu, Fengyuan Chen, Huo Xu, Xue Cao, Ciara Chun Chen, Jingzhen Wang, Yongyan Liao, Xiaoshan Zhu, Ke Pan
Summary: A comprehensive survey was conducted to measure the metal concentrations in commonly used plastics and evaluate the effects of environmental factors and the physiochemical properties of the plastics on their metal leaching. Results showed that temperature, ultraviolet radiation, and salinity played significant roles in metal leaching from plastics. The leaching rate was primarily determined by the crystallinity of the plastics, and biofilm development hindered metal loss in the field.
ENVIRONMENT INTERNATIONAL
(2023)
Article
Engineering, Environmental
Yanfei Zhou, Chao Wu, Yanping Li, Hao Jiang, Aijun Miao, Yongyan Liao, Ke Pan
Summary: Nanoplastics are widely present in marine environments, with accumulation in bivalves having detrimental effects on the ecosystem. This study determined the accumulation of palladium-doped polystyrene nanoplastics in Ruditapes philippinarum and investigated its toxic effects using physiological damage assessments, a toxicokinetic model, and 16S rRNA sequencing. Significant nanoplastic accumulation was observed, leading to oxidative stress, apoptosis, and pathological damage. The study also found alterations in the intestinal microbial community structure. Overall, this work enhances our understanding of the toxic effects and environmental risks associated with nanoplastic accumulation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Zhenghua Tao, Jian Hu, Qingjun Guo, Rongfei Wei, Linlin Jiao, Yanping Li, Fengyuan Chen, Bailing Fan, Wenlu Lan, Ke Pan
Summary: This study investigated the levels of lead contamination in mangrove sediments from the Maowei Sea in China using lead isotopes and partial extraction methods. The results showed that the lead in the sediments was primarily from anthropogenic and natural sources, and that the 204Pb isotope analysis revealed overlooked differences between these sources. The study also found differences in the contribution of different sources between the eastern and western parts of the Maowei Sea.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Jie Ma, Fengyuan Chen, Ciara Chun Chen, Zhen Zhang, Zihan Zhong, Hao Jiang, Junbao Pu, Yanping Li, Ke Pan
Summary: Improper disposal of discarded facemasks leads to contamination in the marine environment. Compared to other plastic waste, surgical masks are more colonized by microorganisms and have higher activity of eukaryotic enzymes associated with plastic degradation in seawater.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Neng Yan, Yuhuai Wang, Tin Yan Wong, Yubing Hu, Huo Xu, Parodi Alessandro, Ke Pan, Jingjing Liu, Henry Lam, Ben Zhong Tang, Jianbo Shi
Summary: This study prepared aggregation-induced emission fluorogen-incorporated nanoparticles (AIE-NPs) with different surface roughness by exposing the nanoparticles to the human digestive system (HDS) for different durations. The study found that the surface roughness affected the interaction between the nanoparticles and the liver. Additionally, the rougher nanoparticles facilitated cellular internalization and induced lysosomal alkalization, ROS production, and cell apoptosis.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Engineering, Environmental
Zhen Zhang, Jie Ma, Fengyuan Chen, Yingya Chen, Ke Pan, Hongbin Liu
Summary: This study investigates the response mechanism of the diatom Phaeodactylum tricornutum to Cd toxicity under ocean acidification conditions. The findings reveal that diatoms grown in acidified seawater display higher surface potential and plasma membrane depolarization, leading to a blunted response to Cd.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
