Article
Environmental Sciences
Yajie Chen, Xingang Liu, Shankui Yuan, Fengshou Dong, Jun Xu, Xiaohu Wu, Yongquan Zheng
Summary: A novel passive sampler technique using Oleic acid-embedded cellulose acetate membranes (OECAMs) was developed to evaluate the bioavailability of epoxiconazole (EPO) to earthworms. The study found a significant linear relationship between EPO concentrations in earthworms and OECAMs, with OECAMs reaching equilibrium for EPO sampling within 2 days. Additionally, EPO concentrations in soil porewater, earthworms, and OECAMs were lower in soils with higher organic matter content, showing good potential for OECAMs as a passive sampler for evaluating EPO bioavailability.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Songjing Yan, Mandar Bokare, Upal Ghosh
Summary: This research compared direct porewater extraction and passive sampling for measuring the freely dissolved concentration of hydrophobic pollutants in sediment porewater (C-pw). The results showed that the direct water extraction method accurately quantified C-pw for low to moderately hydrophobic compounds and could assess the toxicity of PAHs. However, it may have detection limit challenges for strongly hydrophobic pollutants. A new extrapolation approach was proposed to address the uncertainty of C-pw measurement for strongly hydrophobic compounds.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Songjing Yan, Mandar Bokare, Upal Ghosh
Summary: This research compared direct porewater extraction and passive sampling methods for measuring the concentration of hydrophobic pollutants in sediment. The results showed that direct water extraction provided accurate measurements for low to moderately hydrophobic compounds and could assess toxicity and bioaccumulation. However, detection limit challenges exist for strongly hydrophobic compounds.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Rudolf Aro, Pernilla Carlsson, Christian Vogelsang, Anna Karrman, Leo Wy Yeung
Summary: This study investigated the presence of unidentified organofluorine compounds (UOF) in environmental samples from lake Mjosa, river Alna, and sewage samples from Oslo. The findings revealed high concentrations of UOF in these samples, posing a potential health and environmental hazard due to their mostly unknown composition.
Review
Environmental Sciences
Florent F. Risacher, Haley Schneider, Ilektra Drygiannaki, Jason Conder, Brent G. Pautler, Andrew W. Jackson
Summary: Sediment porewater dialysis passive samplers, or peepers, are containers that capture chemicals in sediment and allow for analysis of their concentrations. Despite over 45 years of research, there are no standardized methods, hindering routine regulatory decision-making. Improvements can be made by optimizing volume and membrane geometry, addressing uncertainties related to oxygen presence, and developing pre-equilibration sampling methods. Standardization of peeper methods is crucial for measuring porewater concentrations at contaminated sediment sites.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Teng Wang, Zi-Xuan He, Jun Yang, Liang Wu, Xia-Wen Qiu, Lian -Jun Bao, Eddy Y. Zeng
Summary: Riverine transport of organic contaminants from e-waste recycling zones to surrounding areas has been found to be significant, with sediment acting as a source of some contaminants. The horizontal transport of organophosphorus flame retardants (OPFRs) was higher than that of polybrominated diphenyl ethers (PBDEs), and the flux of contaminants varied between upstream and downstream sites.
Article
Environmental Sciences
Kunpeng Zang, Gen Zhang, Xuemei Xu, Nan Zheng, Haoyu Xiong, Haixiang Hong, Kai Jiang, Miao Liang
Summary: Sediment is the main reservoir and source of methane in the ocean, but there is limited data on methane concentration in sediment in China's shelf seas. This study found that methane concentration in sediment was 2 to 3 orders of magnitude higher than that in overlying seawater columns. Surface sediment was identified as an important source of methane, while bottom seawater acted as a sink. Additionally, the study suggests that earthquakes may enhance methane release from sediment to the seawater column.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Shifra Yonis, Sanober Kahkashan, Dave Adelman, Rainer Lohmann
Summary: Hydrophobic organic contaminants (HOCs) are indicators of human activities that can negatively impact water quality. This study used polyethylene passive samplers to determine concentrations and gradients of polycyclic aromatic hydrocarbons (PAHs) and organochlorinated pesticides (OCPs) in Narragansett Bay. The results showed that PAHs deposited in the water column, while OCPs reached equilibrium.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Zilan Wu, Tian Lin, Limin Hu, Tianfeng Guo, Zhigang Guo
Summary: The study revealed that different controlling factors affect the distribution of PAHs in sediment and porewater. Higher levels of PAHs were found in shallow sediment, while in deeper sediment, PAHs were mainly present in porewater. The diffusion of PAHs in porewater was found to be closely related to the organic carbon content of the bottom sediment.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Megan L. Gillmore, Gwilym A. Price, Lisa A. Golding, Jenny L. Stauber, Merrin S. Adams, Stuart L. Simpson, Ross E. W. Smith, Dianne F. Jolley
Summary: The geographical shift of nickel mining to small island countries of the Southeast Asia and Melanesia region has increased the environmental risk associated with sediment nickel exposure to benthic estuarine/marine biota. The DGT technique can be used as a complementary tool to assess the bioavailability of nickel in estuarine/marine sediments, especially in areas where there is limited toxicity data available.
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
(2021)
Article
Environmental Sciences
Danyang Wang, Xianqiang Tang, Rui Li, Xingyi Wu
Summary: A novel device using electrokinetic geosynthetics was developed to drain porewater with nitrogen and restrain nitrogen release. The batch experiment showed that under specific electrical conditions, the nitrogen release was effectively restrained, demonstrating the potential of electrokinetic geosynthetics in controlling sediment nitrogen release in eutrophic waterbodies.
Article
Environmental Sciences
Hyo Jin Lee, Yu Lee Jang, Haejin Jeong, Da Yeong Jeong, Gi Beum Kim
Summary: The study found that the PMMA passive sampler can be used to measure the freely dissolved concentrations of PAHs in harbor sediment, reflecting the complex properties of the sediment, such as strong sorption characteristics.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Julieta Peluso, Cristina S. Perez Coll, Dante E. Rojas, Diego Cristos, Carolina M. Aronzon
Summary: This study evaluated the sediment and water quality of five sites in the lower basin of the Paraná River, Buenos Aires, Argentina. It found that site S5, with high organic matter and low dissolved oxygen levels, had the most significant toxic effects on amphibians.
Review
Polymer Science
Mvula Confidence Goci, Anny Leudjo Taka, Lynwill Martin, Michael John Klink
Summary: Mercury is a global heavy metal pollutant found in effluents and released into the atmosphere, posing significant risks to humans, animals, and plants. The development of efficient materials and techniques for remediation of mercury pollution is crucial, particularly for low concentrations. This paper reviews the use of chitosan-based polymer nanocomposites for environmental remediation, highlighting their multifunctional properties and non-toxic, environmentally friendly nature. The advances in modifying chitosan with nanomaterials and its effectiveness for mercury uptake are discussed.
Article
Environmental Sciences
Ethan A. Brown, Julien Bonnard, Claire N. Eberle, William J. Jensen, Allie M. Johnson, Jared D. Miller, Ashley J. Yamaura, Ruth M. Sofield
Summary: The experiment demonstrated that metal accumulation on SLMDs is linear, and is influenced by valency and water hardness. Factors such as oleate formation on the SLMD surface and solution chemistry were evaluated.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)