A5066638672- Toxic Organic Pollutants Impact
- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Mercury impact and mitigation studies
- Chemical Thermodynamics and Molecular Structure
- Effects and risks of endocrine disrupting chemicals
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Indoor Air Quality and Microbial Exposure
- Analytical Chemistry and Chromatography
- Per- and polyfluoroalkyl substances research
- Air Quality Monitoring and Forecasting
- Pesticide and Herbicide Environmental Studies
- Odor and Emission Control Technologies
- Pharmaceutical and Antibiotic Environmental Impacts
- Phase Equilibria and Thermodynamics
- Cryospheric studies and observations
- Heavy Metal Exposure and Toxicity
- Adsorption, diffusion, and thermodynamic properties of materials
- Smart Materials for Construction
- Synthesis and biological activity
- Environmental Toxicology and Ecotoxicology
- Nanoplatforms for cancer theranostics
- Advanced Chemical Sensor Technologies
- Organoselenium and organotellurium chemistry
The Scarborough Hospital
2015-2025
University of Toronto
2016-2025
Institute of Earth Environment
2025
Chinese Academy of Sciences
2025
ShanghaiTech University
2020-2024
University of Electronic Science and Technology of China
2024
National University of Singapore
2024
Xian Yang Central Hospital
2024
Guangdong Polytechnic of Industry and Commerce
2024
Jingdezhen University
2024
Abstract A new coronavirus (SARS-CoV-2) has been identified as the etiologic agent for COVID-19 outbreak. Currently, effective treatment options remain very limited this disease; therefore, there is an urgent need to identify anti-COVID-19 agents. In study, we screened over 6,000 compounds that included approved drugs, drug candidates in clinical trials, and pharmacologically active leads target SARS-CoV-2 papain-like protease (PLpro). Together with main (M pro ), PLpro responsible...
Abstract Organophosphate esters (OPEs) have emerged as pervasive environmental contaminants, with concentrations often exceeding those of traditional flame retardants and plasticizers by orders magnitude. Here, we present OPEs in the atmospheric gas phase collected using passive air samplers deployed coastal regions Quebec British Columbia southern Canada. Four OPEs, i.e., tri-n-butyl phosphate (TBP), tris(2-chloroethyl) (TCEP), tris(1-chloro-2-propyl) (TCPP), tris (phenyl) (TPhP) were...
Annually averaged concentrations and enantiomeric compositions of organochlorine pesticides (OCPs) in air were determined 2000/2001 at 40 stations across North America using XAD-based passive samplers. Absolute concentration differences acrossthe continent, the skewness kurtosis distribution, relative abundance parent compound metabolites, chiral signatures can identify regional sources OCP to atmosphere. Specifically, samples collected southeastern United States had elevated...
Reported data on the temperature dependence of atmospheric concentrations semivolatile organic compounds (SOCs) are compiled and expressed as linear regressions logarithm partial pressure in air versus reciprocal temperature: ln pA = m/T + b. Two simple models introduced to explain these temperature. The first assumes equilibrium between atmosphere earth's surface. In second, established a result chemical inflow outflow advected reversible exchange with soil or water model equations...
Responding to a growing need for inexpensive and simple monitoring of persistent organic pollutants (POPs) in the atmosphere, passive air sampling technique based on sorption gaseous resin XAD-2, styrene−divinylbenzene copolymer, has been developed. A quantitative understanding uptake kinetics samplers (PAS) was obtained through combination field calibration studies, controlled wind tunnel experiments, flow simulations. Forty-two PAS were deployed varying time periods up 1 yr at three...
Accurate physical–chemical properties (aqueous solubility SW, octanol–water partition coefficient KOW, vapor pressure P, Henry’s law constant H, octanol–air KOA, octanol SO) are of fundamental importance for modeling the transport and fate organic pollutants in environment. Energies phase transfer used to describe temperature dependence these properties. When trying quantify behavior contaminant mixtures such as polychlorinated biphenyls, consistent required each individual congener. A...
Annually integrated air concentrations of α- and γ-hexachlorocyclohexane (HCH) were determined in 2000/2001 at 40 stations across North America using XAD-based passive samplers to understand atmospheric distribution processes on a continental scale. Elevated levels γ-HCH the atmosphere Canadian Prairies are consistent with ongoing use lindane as seed treatment canola confirm feasibility detecting agricultural pesticide long-term sampling. In contrast γ-HCH, α-HCH show rather uniform Canada...
Accurate physical-chemical properties are of fundamental importance for interpreting and simulating the environmental fate transport behavior polycyclic aromatic hydrocarbons (PAHs). A complete set thermodynamically consistent property data (vapor pressure, aqueous solubility, octanol octanol−water partition coefficient, octanol−air air−water coefficient) 15 PAHs [naphthalene (Nap), acenaphthylene (Acy), acenaphthene (Ace), fluorene (Fluo), phenanthrene (Phe), anthracene (Ant), fluoranthene...
Abstract Given growing concerns about global climate change, it is critical to understand both historical and current shifts in the hydroclimate, particularly regions critically entwined with circulation. The Tibetan Plateau, Earth’s largest highest plateau, a nexus for atmospheric processes, significantly influencing East Asian hydroclimate dynamics through synergy of Monsoon Westerlies. Yet, understanding recent fluctuations their wide-ranging ecological societal consequences remains...
The distribution of organochlorine pesticides (OCP; in past and current use) the mountains western Canada was determined by sampling air, soil, lichen along three elevational transects 2003−2004. Two west Continental Divide were located Mount Revelstoke Yoho National Park, while Observation Peak transect Banff Park is east divide. XAD-based passive air samplers, yielding annually averaged concentrations, deployed, soils collected at all 22 sites, whereas only sampled Revelstoke. Back...
Liquid-phase vapor pressures (PL) and octanol−air partition coefficients (KOA) for N-ethyl perfluorooctane sulfonamide, N-methyl perfluorooctanesulfonamidoethanol, four fluorotelomer alcohols (CF3(CF2)nCH2CH2OH, n = 3, 5, 7, 9) were estimated as a function of temperature using technique based on measuring gas chromatographic retention times relative to those hexachlorobenzene. The method was calibrated volatility data fluorinated aromatic substances, chlorinated benzenes, pesticides. telomer...
A survey of the contamination physical environment Costa Rica with banned organochlorine pesticides (OCPs) relied on sampling air and soil at 23 stations across country in 2004. Average annual concentrations, determined XAD-based passive samplers, surface concentrations were generally low when compared to values reported for North Central America, which is consistent relatively historical domestic use little atmospheric inflow from neighboring countries. Statistical analysis concentration...
In Central America, chemical-intensive tropical agriculture takes place in close proximity to highly valued and biologically diverse ecosystems, yet the potential for atmospheric transport of pesticides from plantations national parks other reserves is poorly characterized. The specific meteorological conditions mountain ranges can lead contaminant convergence at high altitudes, raising particular concern montane forest ecosystems downwind pesticide use areas. Here we show, based on a...
Passive air samplers (PASs) provide an opportunity to improve the spatial range and resolution of gaseous mercury (Hg) measurements. Here, we propose a sampler design that combines sulfur-impregnated activated carbon sorbent, Radiello diffusive barrier, protective shield for outdoor deployments. The amount Hg taken up by increased linearly with time both 11-week indoor (r2 = 0.990) 12-month 0.996) deployment, yielding sampling rates 0.158 ± 0.008 m3 day–1 indoors 0.121 0.005 outdoors. These...
Abstract. Passive air samplers (PASs) for gaseous mercury (Hg) were deployed time periods between 1 month and year at 20 sites across the globe with continuous atmospheric Hg monitoring using active Tekran instruments. The purpose was to evaluate accuracy of PAS vis-à-vis industry standard instruments determine a sampling rate (SR; volume stripped per unit time) that is applicable wide range conditions. spanned latitudes, altitudes, meteorological conditions, concentrations. Precision, based...
Abstract The Minamata Convention on Mercury (Hg) requires improved atmospheric Hg monitoring and characterization of sources. Here we demonstrate how a network passive air samplers (PASs) can be used cost effectively to determine the spatial distribution gaseous estimate emissions at contaminated sites. Gaseous concentrations were mapped around former mine in Monte Amiata district Italy using simultaneous deployments PASs across local regional scale grids. concentration maps help visualize...
Equilibrium partition coefficients or ratios are a fundamental concept in physical chemistry, with wide applications environmental chemistry. While comprehensive data compilations for the octanol–water ratio and Henry’s law constant have existed many years, no comparable effort octanol–air (KOA) exists. Considering increasing use of KOA understanding chemical’s partitioning between variety organic phases (organic atmospheric particles, plant foliage, polymeric sorbents, soil matter, animal...
The use of passive air samplers (PAS) for semi-volatile organic compounds (SVOCs) continues to expand. To advance quantitative understanding uptake kinetics, we calibrated the XAD-PAS, using a styrene–divinylbenzene sorbent, through year-long side-by-side deployment with an active sampler. Twelve XAD-PASs, deployed in June 2020, were retrieved at 4-week intervals, while gas phase SVOCs quantified 48 consecutive week-long samples taken from 2020 May 2021. Consistent XAD's high capacity, even...
Abstract Material production and construction activities are key contributors to global carbon footprints, necessitating sustainable alternatives. This study aims investigate the potential of integrating recycled materials as Supplementary Cementitious Materials (SCMs) in concrete mitigate substantial emissions Singapore’s building sector. The research focuses on Ground Granulated Blast-furnace Slag (GGBFS), waste glass powder, calcined marine clay alternative SCMs, aiming reduce...