A5080993079- Indoor Air Quality and Microbial Exposure
- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Toxic Organic Pollutants Impact
- Odor and Emission Control Technologies
- Analytical Chemistry and Chromatography
- Advanced Chemical Sensor Technologies
- Effects and risks of endocrine disrupting chemicals
- Vehicle emissions and performance
- Analytical chemistry methods development
- Air Quality Monitoring and Forecasting
- Mass Spectrometry Techniques and Applications
- Chemical Reactions and Isotopes
- Occupational Health and Performance
- Pesticide and Herbicide Environmental Studies
- Metabolomics and Mass Spectrometry Studies
- Biosimilars and Bioanalytical Methods
- Water Quality Monitoring and Analysis
- Adsorption, diffusion, and thermodynamic properties of materials
- Nanomaterials for catalytic reactions
- Pesticide Exposure and Toxicity
- Asymmetric Hydrogenation and Catalysis
- Process Optimization and Integration
- Environmental Toxicology and Ecotoxicology
- Atmospheric aerosols and clouds
California Department of Public Health
2012-2019
Environmental Health
2015
Kowloon Hospital
2013
Association of Public Health Laboratories
2012
University of Hong Kong
2007-2011
Hong Kong University of Science and Technology
2007-2011
University of Ottawa
1986
The Henry's law constants of glyoxal, glycolic acid and glyoxylic in pure water were determined over the range 278 308 K for first time by a bubble column technique. These compounds chosen because their perceived involvement formation secondary organic aerosol through in‐cloud processing pathways. experimentally are: H = 4.19 × 10 5 exp[(62.2 3 /R) (1/T − 1/298)]; acid, 2.83 4 exp[(33.5 1.09 exp[(40.0 1/298)]. glyoxal presence sodium chloride sulfate also at 298 K. While is enhanced less...
Commuters who spend long hours on roads are exposed to high levels of traffic related air pollutants (TRAPs). Despite some well-known multiple adverse effects TRAPs human health, limited studies have focused mitigation strategies reduce these effects. In this study, we measured fine particulate matter (PM2.5) and ultrafine particle (UFP) concentrations inside outside 17 taxis simultaneously while they were driven roadways. The drivers’ urinary monohydroxylated polycyclic aromatic...
[1] Ethylene is one of the most abundant anthropogenic volatile organic compounds (VOCs) in urban atmospheres. The potential forming secondary aerosol (SOA) by this smallest alkene environments has not previously been considered because general lack attention to SOA formation through in-cloud processing soluble oxidation products. Ethylene reacts with OH radicals form glycolaldehyde as its major Glycolaldehyde partitions into cloud water where it oxidized glyoxylic acid and oxalic thereby...
Risk assessment for indoor formaldehyde and other carbonyls was investigated at an university in Xi'an, Shaanxi, China. Eight representative locations, including six workplaces two residential units of staff apartments a student dormitory, were chosen. The pollution origins identified according to the variability molar composition correlation analysis target species. Environmental tobacco smoke (ETS), cooking activities, office technologies such as printers copiers can produce different...
A pilot hazardous airborne carbonyls study was carried out in Hong Kong and the Mainland of China. Workplace air samples 14 factories various types manufacturing industrial operations were collected analyzed for a panel 21 carbonyl compounds. The can be classified into five general categories, including food processing, electroplating, textile dyeing, chemical manufacturer, petroleum refinery. Formaldehyde invariably most abundant compound among all workplace samples, accounting 22.0–44.0%...
This paper examines the collection efficiencies of acetone and methyl ethyl ketone under different relative humidities, flow rates, sample durations, for ambient sampling laboratory experiments.
A comprehensive assessment of indoor carbonyl compounds for the academic staff, workers, and students was conducted on a university campus in Xiamen, China. total 15 representative environment categories, including 12 workplaces three residential units, were selected. The potential pollution sources identified based variability molar compositions correlation analyses target carbonyls. Furnishing materials, cooking emissions, electronic equipment, such as photocopiers, can generate various...
2,4-Dinitrophenylhydrazine (DNPH) is a typical derivatizing agent coated on sorbent cartridges for detection of carbonyl compounds at ambient levels. However, airborne oxidant ozone (O3) can react with DNPH to form side products that interfere the accurate carbonyls. It most critical interferer degrading carbonyl-DNP-hydrazone formed cartridge during sampling, resulting in underestimation concentrations; this strong be removed by installing denuder or scrubber filled potassium iodide (KI)...
A systematic study of reductions unsymmetrically substituted maleic anhydrides by a variety metal hydride reagents indicates that the high regioselectivity observed in these reactions is controlled chiefly electronic factors.
Urinary dialkyl phosphate metabolites (DAPs) are used as biomarkers to evaluate human exposure organophosphate pesticides. The objective was potential artifacts in urinary DAPs analysis during sample preparation and method calibration. Diluted urine pools were commonly prepare calibration standards minimize the effects due complexity of matrix. Matrix on measurements evaluated by spiking known amount into distilled water, synthetic diluted pool. Different matrices resulted similar...
Background: the dry blood spot (DBS) sampling technique has been extensively used not only in clinical and disease studies but also human biomonitoring for environmental chemicals. DBS requires a few drops of collection, shipping storage samples are easy. Aims: Develop quantitative method that small volume (50 µL) or single determination polybrominated diphenyl ethers (PBDEs) polychlorinated biphenyls (PCBs). Method: The target analytes include five dioxin-like PCBs (dl-PCBs, 77, 105, 118,...