A5078571018- Mercury impact and mitigation studies
- Analytical chemistry methods development
- Analytical Chemistry and Chromatography
- Essential Oils and Antimicrobial Activity
- Phase Equilibria and Thermodynamics
- Toxic Organic Pollutants Impact
- Atmospheric chemistry and aerosols
- Mass Spectrometry Techniques and Applications
- Melamine detection and toxicity
- Pharmacological Effects of Natural Compounds
- Electrochemical Analysis and Applications
- Chromatography in Natural Products
- Synthesis and bioactivity of alkaloids
- Conducting polymers and applications
- Dental Health and Care Utilization
- Oral microbiology and periodontitis research
- Cancer Treatment and Pharmacology
- Mesoporous Materials and Catalysis
- Advancements in Transdermal Drug Delivery
- Bee Products Chemical Analysis
- Berberine and alkaloids research
- Computational Drug Discovery Methods
- Nanoparticle-Based Drug Delivery
- Dental Anxiety and Anesthesia Techniques
- Silymarin and Mushroom Poisoning
Shahid Beheshti University
2015-2024
ORCID
2021
McGill University
2003-2015
Faculty (United Kingdom)
2015
Université du Québec à Montréal
2007
Université de Montréal
2007
Institut National de la Recherche Scientifique
2007
University of Guilan
2006
Mercury is a persistent, toxic and bio-accumulative pollutant of global interest. Its main mass in the troposphere form elemental gas-phase mercury. Rapid, near-complete depletion mercury has been observed during spring atmospheric boundary layer frozen marine areas Arctic, sub-Arctic Antarctic locations. It strongly correlated with ozone depletion. To date, evidence indicated that chemistry involving halogen gases from surface sea-salt mechanism this destruction. Precisely which are players...
A B S T R C Mercury is a persistent, toxic and bio-accumulative pollutant of global interest.Its main mass in the troposphere form elemental gas-phase mercury.Rapid, near-complete depletion mercury has been observed during spring atmospheric boundary layer frozen marine areas Arctic, sub-Arctic Antarctic locations.It strongly correlated with ozone depletion.To date, evidence indicated that chemistry involving halogen gases from surface sea-salt mechanism this destruction.Precisely which are...
Mercury is a key toxic environmental pollutant, and its speciation affects bioavailability. BrO radicals have been identified as oxidants during mercury depletion events observed in Arctic sub-Arctic regions. We report the first experimental product study of BrO-initiated oxidation elemental at atmospheric pressure ca. 0.987 bar T = 296 ± 2 K. used chemical ionization electron impact mass spectrometry, gas chromatography coupled to spectrometer, MALDI-TOF cold vapor atomic fluorescence...
It is well-established that atmospheric deposition transports Hg to Arctic regions, but the postdepositional dynamics of can alter its impact on food chains are less understood. Through a series in situ experiments, we investigated redox transformations coastal and inland aquatic systems. During spring summer, reduction streams pond waters decreased across 4-fold increase salinity. This alteration due chloride was counterbalanced by presence particles, which favored conversion oxidized...
A SBA-15/polyaniline para-toluenesulfonic acid nanocomposite supported micro-solid-phase extraction procedure has been developed for the of parabens (methylparaben, ethylparaben, and propylparaben) from wastewater cosmetic products. The variables interest in process were pH sample, sample eluent volumes, sorbent amount, salting-out effect, desorption time, stirring rate. Plackett-Burman design was performed screening order to determine significant affecting efficiency. Then, factors...
Measurement of oxidized mercury, Hg(II), in the atmosphere poses a significant analytical challenge as Hg(II) is present at ultra-trace concentrations (picograms per cubic meter air). Current technologies are sufficiently sensitive to measure total Hg but cannot determine chemical speciation Hg(II). We detail here development soft ionization mass spectrometric technique coupled with preconcentration onto nano- or microparticle-based traps prior analysis for measurement mercury halides air....
This paper deals with a new application of polyaniline synthesized chemically, coated on sawdust via cast method in the form emeraldine base (EB) from formic acid as solvent, and used an effective adsorbent for removal mercuric ion or other heavy metals aqueous solution. Among different parameters investigated, effect pH was found to be most prominent. It that metal uptake is occurred under neutral slightly alkaline conditions, while relatively strong acidic media, sorption investigated ions...
Ozone is assumed to be the predominant tropospheric oxidant of gaseous elemental mercury (Hg0(g)), defining global atmospheric lifetime. In this study we have examined effects two atmospherically relevant polar compounds, H2O(g) and CO(g), on absolute rate coefficient O3-initiated oxidation Hg0(g), at 296 ± 2 K using gas chromatography coupled mass spectrometry (GC-MS). CO-added experiments, observed a significant increase in reaction that could explained by pure gas-phase chemistry....
In the present study, fatty acids and essential oils of flower borage (Borago officinalis L.) were obtained by supercritical carbon dioxide fluid extraction under different conditions. The extracts compared to oil isolated hydrodistillation. analyzed gas chromatography mass spectrometry. compounds identified according their retention indices spectra. experimental parameters (SFE) optimized using a central composite design after full factorial design. Extraction yields based on SFE varied in...
A simple speciation method using selective electrodeposition with a mercury coated electrode in hydrochloric acid medium was developed for the and determination of trace amounts Te (IV) (VI) water samples by electrothermal atomic absorption spectroscopy (ETAAS). Bottled drinking water, river sea were spiked solutions subjected to an process prior ETAAS. The is based on reduction tellurium at uncontrolled applied potential (2.0 V) electrode. In acidic media (1.0 M HCl solution) only can be...
Background: Orange peel essential oils were obtained using supercritical fluid extraction. This method is an important high scaling extraction used for the of plant and animal extracts.
 Objectives: The aim this study was optimization orange oil.
 Methods: experimental parameters Supercritical Fluid Extraction (SFE) such as temperature, pressure, time, modifier volume optimized a central composite design after 24-1 fractional factorial design. peels collected from ripe washed, air...