A5008081391- Analytical Chemistry and Chromatography
- Toxic Organic Pollutants Impact
- Environmental Toxicology and Ecotoxicology
- Pharmaceutical and Antibiotic Environmental Impacts
- Mass Spectrometry Techniques and Applications
- Microplastics and Plastic Pollution
- Microfluidic and Capillary Electrophoresis Applications
- Pesticide and Herbicide Environmental Studies
- Recycling and Waste Management Techniques
- Microwave-Assisted Synthesis and Applications
- Analytical chemistry methods development
- Pesticide Residue Analysis and Safety
- Effects and risks of endocrine disrupting chemicals
- Analytical Chemistry and Sensors
- Environmental Chemistry and Analysis
- Synthesis and biological activity
- Chromatography in Natural Products
- Insect and Pesticide Research
- Advanced Chemical Sensor Technologies
- Analytical Methods in Pharmaceuticals
- Cancer therapeutics and mechanisms
- Per- and polyfluoroalkyl substances research
- Synthesis of Organic Compounds
- Water Quality and Resources Studies
- Marine and coastal ecosystems
Southern California Coastal Water Research Project
2015-2025
Middle East Studies Association of North America
2017
University of California, Riverside
2006-2013
Chinese Academy of Sciences
1999-2012
Mississippi State University
2007
Lanzhou Institute of Chemical Physics
1999-2000
Abstract Eight pyrethroids and fipronil its three major degradates were analyzed in urban estuarine sediments that exhibited a range of toxic effects to an amphipod test species. Sediments from Ballona Creek, estuary Southern California (USA), collected during dry season events by gas chromatography with electron capture negative chemical ionization mass spectrometric detection (GC‐ECD GC‐NCI‐MS). The two methods agreement for intermediate levels pyrethroid contamination (10–50 ng/g wt) but...
Passive samplers were deployed to the seafloor at a marine Superfund site on Palos Verdes Shelf, California, USA, and used determine water concentrations of persistent organic pollutants (POPs) in surface sediments near-bottom water. A model Fickian diffusion across thin boundary layer sediment-water interface was calculate flux contaminants due molecular diffusion. Concentrations four stations DDE, DDD, DDMU, selected PCB congeners from column. Three passive sampling materials compared: PE...
Passive sampling was used to deduce water concentrations of persistent organic pollutants (POPs) in the vicinity a marine Superfund site on Palos Verdes Shelf, California, USA. Precalibrated solid phase microextraction (SPME) fibers and polyethylene (PE) strips that were preloaded with performance reference compounds (PRCs) codeployed for 32 d along an 11-station gradient at bottom, surface, midwater depths. Retrieved samplers analyzed DDT congeners their breakdown products (DDE, DDD, DDMU,...
This work presents the results of an international interlaboratory comparison on ex situ passive sampling in sediments. The main objectives were to map state science passively sediments, identify sources variability, provide recommendations and practical guidance for standardized sampling, advance use regulatory decision making by increasing confidence technique. study was performed a consortium 11 laboratories included experiments with 14 formats 3 sediments 25 target chemicals (PAHs PCBs)....
Abstract The present study investigated cross‐media transport between both the sediment and water column atmosphere, to understand role of each compartment as a source or sink polycyclic aromatic hydrocarbons (PAH) in southern California, USA, coastal waters. Concentrations PAH were measured column, at four water‐quality‐impaired sites California: Ballona Creek Estuary, Los Angeles Harbor, Upper Newport Bay, San Diego Bay. These concentrations used calculate site‐specific sediment–water...
Little is known about pyrethroid fate and effects in estuarine marine environments. In the present study, extent magnitude of pyrethroids coastal embayments Southern California Bight (SCB), USA, were assessed. Using a stratified probabilistic design, 155 sediment samples collected from four embayment habitats (estuaries, marinas, open bays, ports) analyzed for eight common-use pyrethroids. Total concentrations ranged less than 0.5 to 230 µg/kg dry weight (area-weighted mean concentration=5.1...
Passive samplers for moderately hydrophobic organic compounds (MHOCs) (i.e., log Kow ranging from 2 to 5) are under-developed compared those that target polar or strongly compounds. The goal of this study was identify a suitable polymer and develop robust sensitive film-based passive sampler MHOCs in aquatic systems. Poly(methyl methacrylate) (PMMA) exhibited the highest affinity fipronil its three metabolites fipronils) (log 2.4-4.8) as model with polyethylene nylon films. In addition,...
Abstract Environmental enantioselectivity information is important to fate assessment of chiral contaminants. Warfarin, a rodenticide and prescription medicine, chemical but used in racemic form. Little known about its enantioselective behavior the environment. In this study, degradation warfarin turfgrass groundcover soils was examined aerobic ambient temperature conditions. An analytical method established using novel triproline stationary phase high performance liquid chromatography....