A5024835752- Toxic Organic Pollutants Impact
- Microbial bioremediation and biosurfactants
- Groundwater flow and contamination studies
- Wastewater Treatment and Nitrogen Removal
- Mercury impact and mitigation studies
- Environmental Toxicology and Ecotoxicology
- Water Treatment and Disinfection
- Isotope Analysis in Ecology
- Per- and polyfluoroalkyl substances research
- Dental materials and restorations
- Microplastics and Plastic Pollution
- Pharmaceutical and Antibiotic Environmental Impacts
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Environmental remediation with nanomaterials
- Effects and risks of endocrine disrupting chemicals
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Heavy Metal Exposure and Toxicity
- Oral microbiology and periodontitis research
- Pesticide and Herbicide Environmental Studies
- Analytical chemistry methods development
- Endodontics and Root Canal Treatments
- Constructed Wetlands for Wastewater Treatment
University of Illinois Chicago
2015-2024
U.S. National Science Foundation
2018
Missouri Department of Health and Senior Services
2012
École nationale des ponts et chaussées
2010
Illinois Department of Natural Resources
2008
University of Minnesota
2006
Rutgers, The State University of New Jersey
1998-2003
Vanderbilt University
2002-2003
University of Washington
1996-2001
This is the first study on organophosphate ester (OPEs) flame retardants and plasticizers in sediment of Great Lakes. Concentrations 14 OPEs were measured three cores 88 Ponar surface grabs collected from Lakes Ontario, Michigan, Superior North America. The sum these (Σ14OPEs) averaged 2.2, 4.7, 16.6 ng g–1 dw Superior, respectively. Multiple linear regression analyses demonstrated statistically significant associations between logarithm concentrations Σ14OPEs as well selected congeners grab...
Abstract Polycyclic aromatic hydrocarbon (PAH) contamination of the environment represents a serious threat to health humans and ecosystems. Given human effects PAHs, effective cost‐competitive remediation technologies are required. Bioremediation has shown promise as potentially low‐cost treatment option, but concerns about slow process rate bioavailability limitations have hampered more widespread use this technology. An option enhance PAHs is add surfactants directly soil in situ or ex...
ABSTRACT Pure bacterial cultures were isolated from a highly enriched denitrifying consortium previously shown to anaerobically biodegrade naphthalene. The isolates screened for the ability grow in liquid culture with naphthalene as sole source of carbon and energy presence nitrate. Three naphthalene-degrading pure obtained, designated NAP-3-1, NAP-3-2, NAP-4. Isolate NAP-3-1 tested positive denitrification using standard assay. Neither isolate NAP-3-2 nor NAP-4 produced gas assay, but both...
Sediment cores were taken in 2001 and 2002 Lake Superior at six locations away from lakeshores segmented 0.5−5 cm intervals. The year of sediment deposition was estimated for each segment four using the 210Pb dating technique. Samples Soxhlet-extracted cleaned up by silica gel fractionation, concentrations 10 polybrominated diphenyl ethers (PBDEs) 19 polychlorinated biphenyls (PCBs) measured GC-MS SIM mode. In contrast to recent declining or level-off trends PCB fluxes, sedimentary records...
Polycyclic aromatic hydrocarbon (PAH) contaminated sediments from Piles Creek (PC) and Newtown (NC) in the NY/NJ Harbor estuary were separated into size fractions further low (<1.7 g cm(-3)) high (>1.7 density fractions. The fractionated characterized for carbon content pore structure, surface area, PAH concentration. Most PAHs (50-80%) both associated with low-density fraction, which represents only 3-15% of total sediment mass, at levels greater than expected based on equilibrium...
Previously unknown halogenated compounds were detected during the analysis of flame retardants in two sediment cores collected from Lake Michigan. Gas chromatography coupled with high- or low-resolution mass spectrometry (MS) was used to determine chemical structures for a total 15 novel polyhalogenated carbazoles (PHCs) general molecular formula C12H9-x-y-zNClxBryIz. On basis spectra generated by electron impact (EI) and capture negative ionization (ECNI) MS, eight PHCs tentatively...
Polyhalogenated carbazoles (PHCZs) have been increasingly detected in the environment. Their similarities chemical structure with legacy pollutants and their potential toxicity caused increasing concern. In this work, 112 Ponar grab 28 core sediment samples were collected from Lakes Michigan, Superior, Huron, a total of 26 PHCZs analyzed along unsubstituted carbazole using gas chromatography coupled single- or triple-quadrupole mass spectrometry. Our results show that accumulation sediments...
Although many polycyclic aromatic hydrocarbons (PAHs) are known to be biodegraded under aerobic conditions, most contaminated sediments anaerobic. With recent results demonstrating that some bicyclics and PAHs can degraded without oxygen, information on specific biodegradation rates electron acceptor stoichiometry is lacking. A fluidized bed reactor (FBR) enrichment approach was used enrich for bacteria from creosote-contaminated marine with nitrate or sulfate as the sole potential terminal...
Sediment cores were taken in 2002 Lakes Michigan and Huron at six locations. A total of 75 samples characterized, dated using 210Pb, analyzed for 10 congeners polybromodiphenyl ether (PBDE) including BDE209, as well 39 polychlorinated biphenyls (PCBs). The concentrations nine tri- through hepta-BDE (∑9PBDE) the surficial sediments range from 1.7 to 4 ng g-1 Lake 1.0 1.9 Huron, on basis dry sediment weight. ∑9PBDEs fluxes around year are 36 109 pg cm-2 yr-1 30 73 with spatial variations both...
Sediment cores were taken in 2002 Lakes Ontario and Erie at four locations. A total of 48 sediment samples characterized, dated using 210Pb, analyzed for 10 congeners polybrominated diphenyl ethers (PBDEs) including BDE209 as well 39 polychlorinated biphenyls (PCBs). The surficial concentrations nine tri- through hepta-BDE (Σ9PBDE) are 4.85 6.33 ng g-1, sampling sites ON40 ON30 Lake Ontario, 1.83 1.95 g-1 ER37 ER09 Erie, respectively, based on dry weight. 242 211 50 55 ER09. Σ9PBDEs fluxes...
While previous studies have found that unknown natural and synthetic organo-bromine compounds (NSOBCs) contributed more than 99% of the total organic bromine (Br) in environment, there was no efficient method for untargeted screening to identify NSOBCs environmental matrixes. A novel identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with Q Exactive instrument developed. This included a data-independent precursor isolation characteristic fragment (DIPIC-Frag)...
As for lineages of known methanogens, several uncultured archaea were recurrently retrieved in freshwater sediments. However, knowledge is missing about how these might be affected and structured according to depth. In the present study, vertical changes archaeal communities characterized deep sediment meromictic Lake Pavin. For that purpose, an integrated molecular approach was performed gain information on structure, composition, abundance stratification thriving anoxic sediments along a...
This study considers desorption kinetics for 12 field-aged polycyclic aromatic hydrocarbons (PAHs) desorbing from size- and density-fractionated sediments collected two locations in the New York/New Jersey Harbor Estuary. Desorption PAHs with a log octanol−water partition coefficient greater than 6 were well-described by one-domain diffusion model that assumes are initially uniformly distributed throughout spherical sediment aggregates. PAH hydrophobicity specific surface area parameters...
Surface grab and core sediment samples were collected from Lakes Michigan, Superior, Huron 2010 to 2012, concentrations of herbicides atrazine, simazine, alachlor, as well desethylatrazine (DEA), determined. Concentrations atrazine in surface grabs ranged 0.01 1.7 ng/g dry weight are significantly higher the southern basin Lake Michigan (latitude <44°) than other parts three lakes. The highest concentration alachlor was found sediments Saginaw Bay Huron. inventory net fluxes these decline...
Previously unreported natural and synthetic organo-bromine compounds (NSOBCs) have been found to contribute more than 99% of total organic bromine (TOB) in environmental matrices. We recently developed a novel untargeted method (data-independent precursor isolation characteristic fragment, DIPIC-Frag) identified ∼2000 NSOBCs two sediments from Lake Michigan. In this study, was used investigate the distributions these 23 surficial samples 24 segments sediment core were detected all exhibited...
A total of 199 sediment samples were collected from 16 locations in the five Laurentian Great Lakes, and each was analyzed for 10 congeners polybrominated diphenyl ethers (PBDEs) as well selected polychlorinated biphenyls (PCBs). This paper presents a comprehensive analysis on previously published results individual lakes. The accumulation nine tri- to hepta-PBDE (∑9BDEs) sediments all Lakes estimated be approximately 5.2 ± 1.1 tonnes, that decabromodiphenyl ether (BDE209) 92 13 around year...
South-central Arkansas (AR) is home to major manufacturing facilities for brominated flame retardant chemicals (BFRs) in the U.S. Unintended release during production may have caused accumulation of BFRs local environment. In this work, sediment cores were collected from six water bodies AR, including three located close BFR El Dorado and Magnolia, investigate past recent deposition histories. A total 49 polybromodiphenyl ethers (PBDEs) decabromodiphenyl ethane (DBDPE) detected, with...