A5091826855- Mercury impact and mitigation studies
- Heavy metals in environment
- Environmental Toxicology and Ecotoxicology
- Toxic Organic Pollutants Impact
- Isotope Analysis in Ecology
- Heavy Metal Exposure and Toxicity
- Marine animal studies overview
- Water Treatment and Disinfection
- Microplastics and Plastic Pollution
- Coastal wetland ecosystem dynamics
- Pesticide and Herbicide Environmental Studies
- Air Quality and Health Impacts
- Pharmaceutical and Antibiotic Environmental Impacts
- Fire effects on ecosystems
- biodegradable polymer synthesis and properties
- Fish Ecology and Management Studies
- Nanoparticles: synthesis and applications
- Phosphorus and nutrient management
- Water Quality and Pollution Assessment
- Urban Stormwater Management Solutions
- Constructed Wetlands for Wastewater Treatment
- Recycling and Waste Management Techniques
- Adsorption and biosorption for pollutant removal
- Aluminum toxicity and tolerance in plants and animals
- Effects and risks of endocrine disrupting chemicals
Chinese University of Hong Kong
2003-2025
University of North Carolina at Greensboro
2015-2024
City University of Hong Kong
2023-2024
Hong Kong Baptist University
2006-2021
University of Minnesota
2011
University of Hong Kong
2003-2007
Hong Kong University of Science and Technology
2003-2007
Mercury (Hg) is an important environmental pollutant due to its highly toxic nature and widespread occurrence in aquatic systems. The biokinetics of Hg zooplankton have been largely ignored previous studies. This study examines the assimilation, dissolved uptake, efflux inorganic mercury [Hg(II)] methylmercury (MeHg) a freshwater cladoceran, Daphnia magna, models exposure pathways Hg(II) MeHg daphnids. assimilation efficiencies (AEs) both species decreased significantly with increasing algal...
Stable isotope compositions of mercury (Hg) were measured in the outlet stream and soil cores at different landscape positions a 9.7-ha boreal upland-peatland catchment. An acidic permanganate/persulfate digestion procedure was validated for water samples with high dissolved organic matter (DOM) concentrations through Hg spike addition analysis. We report relatively large variation mass-dependent fractionation (δ202Hg; from −2.12 to −1.32‰) smaller, but significant, mass-independent (Δ199Hg;...
Methylmercury (MeHg), a highly neurotoxic substance, accumulates in aquatic food webs, and is enriched odd isotopes (i.e., 199Hg 201Hg), purportedly as result of abiotic photodegradation surface waters. Here, we highlight the potential role phytoplankton mass independent fractionation (MIF) MeHg marine food-webs by providing evidence (1) degradation intracellular reduction inorganic mercury (Hg(II)) microalga, Isochrysis galbana; (2) large, positive MIF (Δ199Hgreactant – Δ199Hgproduct ∼...
Between 1932 and 1968, industrial wastewater containing methylmercury (MeHg) other mercury (Hg) compounds was discharged directly into Minamata Bay, Japan, seriously contaminating the fishery. Thousands of people who consumed tainted fish shellfish developed a neurological disorder now known as disease. Concentrations total (THg) in recent sediment samples from Bay remain higher than those Japanese coastal waters, elevated concentrations THg sediments greater Yatsushiro Sea suggest that Hg...
The photochemical reduction of Hg(II) is an important pathway in the environmental Hg cycle because it competes with methylation and potentially limits formation bioaccumulative methylmercury. stable isotope systematics have proven to be effective tool for investigating transport, transformation, bioaccumulation Hg. dominant cause mass independent fractionation (MIF) nature various species Hg(II). However, difficult fully interpret signatures due lack mechanistic information about which...
Runoff from a destroyed town following large wildland-urban interface wildfire transported metals into adjacent watersheds.
Mercury (Hg) is widely distributed in the environment, and its organic form, methylmercury (MeHg), can extensively bioaccumulate biomagnify aquatic terrestrial food webs. Concentrations of MeHg organisms are highly variable, sources natural webs often not well understood. This study examined stable isotope ratios (mass-dependent fractionation, as δ(202)HgMeHg; mass-independent Δ(199)HgMeHg) benthic invertebrates, juvenile steelhead trout (Oncorhynchus mykiss), water striders (Gerris remigis)...
We measured total mercury (THg) and monomethyl (MMHg) concentrations (Hg) isotopic compositions in sediment aquatic organisms from the Yuba River (California, USA) to identify Hg sources biogeochemical transformations downstream of a historical gold mining region. Sediment THg δ202Hg decreased upper Fan lower Feather River. These results are consistent with release during followed by mixing dilution. The composition (δ202Hg = −0.38 ± 0.17‰ Δ199Hg 0.04 0.03‰; mean 1 SD, n 7) provides...