A5074809866- Analytical Chemistry and Chromatography
- Advanced Chemical Sensor Technologies
- Effects and risks of endocrine disrupting chemicals
- Toxic Organic Pollutants Impact
- Microplastics and Plastic Pollution
- Computational Drug Discovery Methods
- Oil Spill Detection and Mitigation
- Recycling and Waste Management Techniques
- Metabolomics and Mass Spectrometry Studies
- Atmospheric and Environmental Gas Dynamics
- Water Treatment and Disinfection
- Insect Pheromone Research and Control
- Heavy metals in environment
- Adsorption and biosorption for pollutant removal
- Spectroscopy and Chemometric Analyses
- Heavy Metal Exposure and Toxicity
- Contact Dermatitis and Allergies
- Analytical chemistry methods development
- Water Quality Monitoring and Analysis
- Pharmaceutical and Antibiotic Environmental Impacts
- Arsenic contamination and mitigation
- Nanoparticles: synthesis and applications
- Antibiotic Use and Resistance
- Healthcare and Environmental Waste Management
- Petroleum Processing and Analysis
GEOMAR Helmholtz Centre for Ocean Research Kiel
2023-2025
National University of Sciences and Technology
2009-2024
Khalifa University of Science and Technology
2024
University of the Sciences
2022-2023
Bigelow Laboratory for Ocean Sciences
2017-2021
Jumeira University
2020
École Polytechnique Fédérale de Lausanne
2012-2017
Masdar Institute of Science and Technology
2015
Swiss Federal Institute of Aquatic Science and Technology
2012-2014
National University of Medical Sciences
2009
Photodegradation of plastic consumer products is known to accelerate weathering and facilitate the release chemicals particles into aquatic environment. However, these processes are complex. In our presented pilot study, eight were leached in distilled water under strong ultraviolet (UV) light simulating months Central European climate compared their respective dark controls (DCs). The leachates formed exploratorily characterized using a range chemical analytical tools describe degradation...
During the first hours after release of petroleum at sea, crude oil hydrocarbons partition rapidly into air and water. However, limited information is available about very early evaporation dissolution processes. We report on composition slick during day a permitted, unrestrained 4.3 m(3) conducted North Sea. Rapid mass transfers volatile soluble were observed, with >50% ≤C17 disappearing within 25 h from this <10 km(2) area μm thickness. For sheen, losses ≤C16 observed 1 h. developed...
About half of the surface oil floating on Gulf Mexico in aftermath 2010 Deepwater Horizon spill was transformed into oxygenated hydrocarbons (OxHC) within days to weeks. These OxHC persist for years oil/sand aggregates nearshore and beach environments, there is concern that these might represent a long-term source toxic compounds. However, because this fraction continuum transformation products are not well chemically characterized, it included current fate effect models. This challenges an...
Comprehensive two-dimensional gas chromatography (GC × GC) is effective for separating and quantifying nonpolar organic chemicals in complex mixtures. Here we present a model to estimate 11 environmental partitioning properties analytes based on GC chromatogram retention time information. The considered span several phases including pure liquid, air, water, octanol, hexadecane, particle natural matter, dissolved organism lipids. training set test sets are literature compilation of 648...
Comprehensive two-dimensional gas chromatography (GC × GC) chromatograms typically exhibit run-to-run retention time variability. Chromatogram alignment is often a desirable step prior to further analysis of the data, for example, in studies environmental forensics or weathering complex mixtures. We present new algorithm aligning whole GC chromatograms. This technique based on points that have locations indicated by user both target chromatogram and reference chromatogram. applied two sets...
The chemical parameters needed to explain and predict bioavailability, biodynamics, baseline toxicity are not readily available for most nonpolar chemicals detected in the environment. Here, we demonstrate that comprehensive two-dimensional gas chromatography (GC × GC) retention times can be used 26 relevant properties chemicals, specifically: partition coefficients diverse biotic media passive sampler phases; aquatic toxicity; diffusion coefficients. considered phases include membrane...
Micro- and nanoplastic particles fibers are ubiquitous in the environment have been detected various human organs systems, including kidney, blood, lower respiratory tract, stool. This study aimed to identify quantify synthetic microplastics urine using optical microscopy, Fourier transform infrared spectroscopy, micro-Raman scanning electron microscopy-energy dispersive spectroscopy. The analysis of nine samples revealed presence 43% plastic fragments 57% microfibers, with mean...
Over the past 3 decades, low-density polyethylene (PE) passive sampling devices have been widely used to scout organic chemicals in air, water, sediments, and biotic phases. Experimental partition coefficient data, required calculate concentrations environmental compartments, are not available. In this study, we developed rigorously evaluated linear free energy relationships (LFERs) predict between PE water phase (log Kpe–w). Poly-parameter (pp) LFERs based on Abraham solute parameters...
Abstract The experimental values of skin permeability coefficients, required for dermal exposure assessment, are not readily available many chemicals. existing estimation approaches either less accurate or require parameters that available. Furthermore, current methods easy to apply complex environmental mixtures. We present two models estimate the coefficients neutral organic first model, referred here as 2-parameter partitioning model (PPM), exploits a linear free energy relationship...
We quantified the concentrations of two little-studied brominated pollutants, 1,3,5-tribromobenzene (TBB) and 4-bromobiphenyl (4BBP), in deep water column sediments Lake Geneva. found aqueous 625 ± 68 pg L–1 for TBB 668 86 4BBP over a depth range 70–191.5 m (near-bottom depth), based on duplicate measurements taken at five depths during three separate 1 month sampling periods our site near Vidy Bay. These levels were or 2 orders magnitude higher than components pentabrominated biphenyl ether...
The extensive utilization of pharmaceuticals in developing nations, notably antibiotics, has resulted the occurrence these substances water and wastewater, widely accepted as emerging pollutants. focus this study was to devise a strategy that can efficiently concurrently eliminate multiple antibiotics from an aqueous medium. A silicone-based polymer–polydimethylsiloxane (PDMS) adsorbent prepared remove solution. Characterization PDMS carried out using different techniques, adsorption...
Abstract Partition coefficients for storage lipid-water (logK lw ) and phospholipid-water pw phases are key parameters to understand the bioaccumulation toxicity of organic contaminants. However, published experimental databases these properties dwarfs current estimation approaches cumbersome. Here, we present partition models that exploit correlations logK , with linear combinations octanol-water coefficient ow dimensionless Henry’s law constant (air–water coefficient, aw ). The calibrated...
Risk assessment of chemical mixtures isRisk is challenging because information about the structure, concentration, properties, and toxicity, down to individual compounds, generally not readily accessible. To cope with this challenge, we think Mixture Touch- a web platform that offers one-window solution, for free, risk complex are analyzed comprehensive two-dimensional gas chromatography (GC × GC). GC powerful analytical technique target nontarget analysis mixtures. Our allows users...
The air-blood partition coefficient (Kab) is extensively employed in human health risk assessment for chemical exposure. However, current Kab estimation approaches either require an extensive number of parameters or lack precision. In this study, we present two novel and parsimonious models to accurately estimate values individual neutral organic compounds, as well their complex mixtures. first model, termed the GC×GC was developed based on retention times nonpolar analytes comprehensive...
Disinfection during tertiary municipal wastewater treatment is a necessary step to control the spread of pathogens; unfortunately, it also gives rise numerous disinfection byproducts (DBPs), only few which are regulated because analytical challenges associated with vast number potential DBPs. This study utilized polydimethylsiloxane (PDMS) passive samplers, comprehensive two-dimensional gas chromatography (GC×GC) coupled time-of-flight mass spectrometry (TOFMS), and non-negative matrix...
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We developed a Target Plastic Model (TPM) to estimate the critical plastic burden of organic toxicants in five types plastics, namely, polydimethylsiloxane (PDMS), polyoxymethylene (POM), polyacrylate (PA), low-density polyethylene (LDPE), and polyurethane ester (PU), following Lipid (TLM) framework. By substituting lipid–water partition coefficient TLM with plastic–water coefficients create TPM, we demonstrated that biomimetic nature these phases allows for calculation burdens toxicants,...