A5041893991- Mercury impact and mitigation studies
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Toxic Organic Pollutants Impact
- Geology and Paleoclimatology Research
- Heavy metals in environment
- Marine animal studies overview
- Heavy Metal Exposure and Toxicity
- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Geological and Geochemical Analysis
- Water Treatment and Disinfection
- Analytical chemistry methods development
- Geoscience and Mining Technology
- Air Quality and Health Impacts
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Radioactive contamination and transfer
- Coal Properties and Utilization
- Hydraulic Fracturing and Reservoir Analysis
- Drilling and Well Engineering
- Geochemistry and Geologic Mapping
- Shoulder Injury and Treatment
- Trace Elements in Health
Tianjin University
2018-2025
Capital Medical University
2023-2024
Arizona State University
2016-2024
China University of Petroleum, Beijing
2022-2024
Army Medical University
2024
Chongqing Medical University
2024
Second Affiliated Hospital of Chongqing Medical University
2024
Xiangya Hospital Central South University
2024
Central South University
2024
Ocean University of China
2023-2024
The formation of methylmercury (MeHg), which is biomagnified in aquatic food chains and poses a risk to human health, effected by some iron- sulfate-reducing bacteria (FeRB SRB) anaerobic environments. However, very little known regarding the mechanism uptake inorganic Hg these organisms, part because inherent difficulty measuring intracellular concentration. By using FeRB Geobacter sulfurreducens SRB Desulfovibrio desulfuricans ND132 as model we demonstrate that Hg(II) occurs active...
Abstract Forest biomass and soils represent some of the largest reservoirs actively cycling mercury (Hg) on Earth, but many uncertainties exist regarding source fate Hg in forest ecosystems. We systematically characterized stable isotope compositions foliage, litter, mineral soil horizons across 10 sites contiguous United States. The mass‐independent signatures all depth profiles are more consistent with those atmospheric Hg(0) than Hg(II), indicating that is larger to Within litter...
We investigated the abiotic reduction of inorganic Hg(II) by dissolved organic matter (DOM) and stannous(II) chloride (SnCl2) in absence light quantified fractionation Hg isotopes during these processes. The kinetics DOM was characterized using multiple parallel pseudo-first-order reactions, implying different reactive species resulting from Hg−DOM complexation. Significant mass independent isotopic anomalies were observed both reducing reagents. Isotopes with odd atomic masses (199Hg 201Hg)...
Photochemical reduction of Hg(II) by various low-molecular-weight organic compounds (LMWOC) was investigated to evaluate the effect specific functional groups that are typically encountered in natural dissolved matters (DOM) on photoreactivity and isotope fractionation Hg. LMWOC with reduced sulfur (e.g., cysteine, glutathione) resulted slower photochemical than those without serine, oxalic acid). Reduction rate constants were specifically determined for two contrasting LMWOC: dl-serine...
The objective of this work was to determine the magnitude mercury isotope fractionation during volatilization Hg(0) dissolved in aqueous solution gas phase and develop a method for precise determination ratios gaseous by multi-collector ICP-MS. generated situ reducing Hg(II) using SnCl2 subsequently purged into trapping solution. A 316 μM KMnO4 solution, acidified 0.9 M sulfuric acid, recovered 96.1 ± 4.0% Hg (2 SD, n = 20). observed δ202Hg −0.049 0.065‰ 17) relative initial standard not...
Natural organic matter (NOM)-mediated redox cycling of elemental mercury Hg(0) and mercuric Hg(II) is critically important in affecting inorganic transformation bioavailability. However, these processes are not well understood, particularly anoxic water sediments where NOM can be reduced toxic methylmercury formed. We show that under dark conditions (NOM(re)) simultaneously reduces oxidizes Hg via different reaction mechanisms. Reduction primarily caused by quinones. oxidation controlled...
Thallium (Tl) has been widely used as an internal standard for mass bias correction during high precision mercury (Hg) isotope ratio measurements using multi-collector inductively coupled plasma spectrometry (MC-ICP-MS).
Felsic volcanism in South China with Cu, Hg, and S released exacerbated environmental changes that drove the end-Permian extinction.
Mercury (Hg) stable isotope fractionation has been widely used to trace Hg sources and transformations in the environment, although many important processes remain unknown. Here, we describe during abiotic dark oxidation of dissolved elemental Hg(0) presence thiol compounds natural humic acid. We observe equilibrium mass-dependent (MDF) with enrichment heavier isotopes oxidized Hg(II) a small negative mass-independent (MIF) owing nuclear volume effects. The measured factors for MDF MIF...
Abstract Monomethylmercury (MMHg) is a potent toxin that bioaccumulates and magnifies in marine food webs. Recent studies show abundant methylated Hg deep oceans (>1000 m), yet its origin remains uncertain. Here we measured isotope compositions fauna surface sediments from the Mariana Trench. The trench at 7000–11000 m depth all have substantially positive mass-independent fractionation of odd isotopes (odd-MIF), which can be generated only photic zone via MMHg photo-degradation. Given...
Both reduction and surface adsorption of mercuric mercury [Hg(II)] are found to occur simultaneously on G. sulfurreducens PCA cells under dark, anaerobic conditions. Reduction Hg(II) elemental Hg(0) initially follows a pseudo-first order kinetics with half-life <2 h in the presence 50 nM 1011 L–1 phosphate buffer (pH 7.4). Multiple gene deletions outer membrane cytochromes this organism resulted decrease rate from ∼0.3 0.05 h–1, was nearly absent heat-killed or cell filtrate. Adsorption by...
Mercuric ion, Hg2+, forms strong complexes with thiolate compounds that commonly dominate Hg(II) speciation in natural freshwater. However, reactions between dissolved aqueous elemental mercury (Hg(0)aq) and organic ligands general, thiol particular, are not well studied although these likely affect Hg cycling the environment. In this study, we compared reaction rates Hg(0)aq a number of selected varying molecular structures sulfur (S) oxidation states dark, anoxic conditions to assess role...
Significance The occurrence of toxic H 2 S-rich water in the photic zone ocean, a phenomenon called euxinia (PZE), had profound negative impacts on ancient biological evolution and modern marine ecosystems. We explore possibility using mercury (Hg) stable isotopes as new proxy for PZE. found that Hg-isotope compositions sedimentary rocks deposited under oxic versus conditions are distinguishable. difference Hg is most likely caused by contrasting chemical behavior response to changes surface...
Non-quantitative Hg cold-vapor generation can compromise the accuracy of isotope analysis, and it should be monitored optimized by performing matrix separation, adopting design gas–liquid separators, tuning sample uptake rate.
Abstract The long-term effects of the Central Atlantic Magmatic Province, a large igneous province connected to end-Triassic mass-extinction (201.5 Ma), remain largely elusive. Here, we document persistence volcanic-induced mercury (Hg) pollution and its on biosphere for ~1.3 million years after extinction event. In sediments recovered in Germany (Schandelah-1 core), record not only high abundances malformed fern spores at Triassic-Jurassic boundary, but also during lower Jurassic...