A5101590934- Mercury impact and mitigation studies
- Air Quality and Health Impacts
- Toxic Organic Pollutants Impact
- Heavy Metal Exposure and Toxicity
- Heavy metals in environment
- Atmospheric chemistry and aerosols
- Chromium effects and bioremediation
- Building materials and conservation
- Fluoride Effects and Removal
- Hygrothermal properties of building materials
- Carbon and Quantum Dots Applications
- Coastal wetland ecosystem dynamics
- Marine animal studies overview
- Water Treatment and Disinfection
- Recycling and utilization of industrial and municipal waste in materials production
- Geology and Paleoclimatology Research
Hunan University
2022-2023
Centre National de la Recherche Scientifique
2018-2022
Université de Toulouse
2018-2022
Géosciences Environnement Toulouse
2018-2022
Institut de Recherche pour le Développement
2018-2021
Affiliated Hospital of Guizhou Medical University
2020
Observatoire Midi-Pyrénées
2018-2019
Chongqing University of Technology
2018
Institute of Geochemistry
2016-2017
Chinese Academy of Sciences
2016-2017
Abstract Anthropogenic mercury (Hg(0)) emissions oxidize to gaseous Hg(II) compounds, before deposition Earth surface ecosystems. Atmospheric reduction of competes with deposition, thereby modifying the magnitude and pattern Hg deposition. Global models have postulated that in atmosphere occurs through aqueous-phase photoreduction may take place clouds. Here we report experimental rainfall rates are much slower than modelled rates. We compute absorption cross sections compounds show fast...
Abstract. The atmospheric deposition of mercury (Hg) occurs via several mechanisms, including dry and wet scavenging by precipitation events. In an effort to understand the cycling seasonal depositional characteristics Hg, samples were collected for approximately 5 years at 17 selected GMOS monitoring sites located in Northern Southern hemispheres framework Global Mercury Observation System (GMOS) project. Total (THg) exhibited annual patterns Hg samples. Interannual differences total are...
Abstract. There exists observational evidence that gaseous elemental mercury (GEM) can be readily removed from the atmosphere via chemical oxidation followed by deposition in polar and sub-polar regions, free troposphere, lower stratosphere, marine boundary layer under specific environmental conditions. Here we report GEM depletions a temperate mixed forest at Mt. Changbai, Northeast China. The strong occurred predominantly night during leaf-growing season absence of oxidized (GOM)...
Mass-independent fractionation (MIF) of stable even mass number mercury (Hg) isotopes is observed in rainfall and gaseous elemental Hg0 globally used to quantify atmospheric Hg deposition pathways. The chemical reaction underlying even-Hg MIF mechanism are unknown however speculated be caused by photo-oxidation on aerosols at the tropopause. Here, we investigate isotope composition free tropospheric oxidized HgII forms high-altitude Pic du Midi Observatory. We find that has positive Δ199Hg,...
Abstract. Long-term continuous measurements of total gaseous mercury (TGM = elemental (GEM) + reactive (RGM)) were conducted simultaneously along with meteorological variables and a suite trace gases at an urban site in Nanjing, China from 18 January to 31 December 2011. Measurements using high resolution vapor analyzer (Tekran 2537B) 5-min time resolution. The average concentration TGM was 7.9 ± 7.0 ng m−3 range 0.8–180 over the study period. concentrations followed typical lognormal...
Abstract Characterizing the speciation and isotope signatures of atmospheric mercury (Hg) downwind mainland China is critical to understanding outflow Hg emission contributing sources. In this study, we measured concentrations gaseous elemental (GEM), particulate bound mercury, oxidized GEM isotopic composition in marine boundary layer East Sea from October 2013 January 2014. Mean (±1σ) GEM, were 2.25 ± 1.03 ng/m 3 , 26 38 pg/m 8 10 respectively. Most events elevated are associated with...
Abstract. Mercury (Hg) concentrations and deposition fluxes in precipitation litterfall were measured at multiple sites (six rural an urban site) across a broad geographic area China. The annual of Hg site 2.0 to 7.2 12.6 ± 6.5 µg m−2 yr−1, respectively. Wet showed clear regional difference with elevated the subtropical zone, followed by temporal zone arid/semi-arid zone. Precipitation depth is primary influencing factor causing variation wet deposition. through ranged from 22.8 62.8 higher...
Abstract. A comprehensive measurement study of mercury wet deposition and size-fractionated particulate (HgP) concurrent with meteorological variables was conducted from June 2011 to February 2012 evaluate the characteristics in urban Nanjing, China. The volume-weighted mean (VWM) concentration rainwater 52.9 ng L−1 a range 46.3–63.6 L−1. per unit area averaged 56.5 μg m−2 over 9 months, which lower than that most Chinese cities, but much higher annual North America Japan. flux exhibited...
China is one of the countries most seriously affected by soil salinization, while impact salt-controlled irrigation on relationship between dissolved organic matter (DOM) and microbial in farmland salinization remains largely unexplored. We conducted a comprehensive survey DOM Ordos’s salinized before after irrigation. Our findings reveal reduction 18.4 mg/L surface (0–10 cm) DOC following irrigation, whereas subsurface (20–40 increased 20.7 mg/L. Moreover, led to an increase aromaticity...
Abstract. Global models of atmospheric mercury generally assume that OH and ozone are the main oxidants converting Hg0 to HgII thus driving deposition ecosystems. However, thermodynamic considerations argue against importance these reactions. We demonstrate here viability atomic bromine (Br) as an alternative oxidant. conduct a global 3-D simulation with GEOS-Chem model assuming Br be sole oxidant (Hg + model) compare previous version OH/O3 model). specify concentration fields based on our...
Methylmercury is a neurotoxic compound that can enter rice fields through rainfall or irrigation with contaminated wastewater, and then contaminate the human food chain consumption of rice. Flooded paddy soil has porous structure facilitates air exchange atmosphere, but presence trace amounts oxygen in flooded field its impact on microbial-mediated formation methylmercury still unclear. We compared microbial communities their functions oxygen-depleted oxygen-limited soil. discovered had...
Biochar can effectively reduce the phytoavailability of mercury (Hg) in soil, but mechanisms are not fully understood. In this study, dynamic changes Hg content adsorbed by biochar (BC-Hg), soil (P-Hg), and dissolved organic matter (DOM) characteristics were determined over a 60-day treatment period. obtained at 300 °C, 500 °C 700 reduced P-Hg concentration assessed MgCl2 extraction 9.4%, 23.5% 32.7%, respectively. However, showed very limited adsorption on Hg, with maximum BC-Hg only...
Abstract. Long-term continuous measurements of total gaseous mercury (TGM = elemental (GEM) + reactive mercury, RGM) were conducted simultaneously along with meteorological variables and a suite trace gases at an urban site in Nanjing, China from 18 January to 31 December 2011. Measurements using high resolution vapor analyzer (Tekran 2537B) 5-min time resolution. The average concentration TGM was 7.9 ± 7.0 ng m−3 range 0.8–180 over the study period. concentrations followed typical lognormal...
Abstract. A comprehensive measurement study of mercury wet deposition and size-fractioned particulate (HgP) concurrent with meteorological variables was conducted from June 2011 to February 2012 evaluate the characteristics in urban Nanjing, China. The volume weighted mean (VWM) concentration rainwater 52.9 ng L−1 a range 46.3–63.6 L−1. per unit area averaged 56.5 μg m−2 over 9 months, which lower than that most Chinese cities, but much higher annual America Japan. flux exhibited obvious...
Hg methylation traditionally occurs in an oxygen-depleted environment but was recently reported oxygen-limited habitats such as settling particles or sediments surface. Flooding paddy soil is a standard and hotspot of MeHg production. However, little known about how oxygen dissolution shapes formation. Here, we conducted microcosm experiment that compared the limited exposure flooding with strict anaerobic under natural conditions three bacterial modification amendments covering low redox...