A5102803078- Pesticide Residue Analysis and Safety
- Analytical chemistry methods development
- Water Quality Monitoring and Analysis
- Pesticide and Herbicide Environmental Studies
- Analytical Chemistry and Chromatography
- Pharmaceutical and Antibiotic Environmental Impacts
- Electrochemical Analysis and Applications
- Molecular Sensors and Ion Detection
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Pesticide Exposure and Toxicity
- Surfactants and Colloidal Systems
- Antibiotics Pharmacokinetics and Efficacy
- Chemical and Physical Properties in Aqueous Solutions
- Analytical Methods in Pharmaceuticals
- Dye analysis and toxicity
- Insect Resistance and Genetics
- Natural product bioactivities and synthesis
- Coffee research and impacts
- Phytochemistry and Biological Activities
- Pharmacological Effects and Assays
- Environmental Chemistry and Analysis
- Morinda citrifolia extract uses
- Adsorption and biosorption for pollutant removal
- Chromium effects and bioremediation
Cheikh Anta Diop University
2015-2024
Université du littoral côte d'opale
2022-2024
Université Alioune Diop de Bambey
2024
Metal trace elements (MTE) are among the most harmful micropollutants of natural waters. Eliminating them helps improve quality and safety drinking water protect human health. In this work, we used mango kernel powder (MKP) as bioadsorbent material for removal Cr (VI) from water. Uv-visible spectroscopy was to monitor quantify during processing using Beer-Lambert formula. Some parameters such pH, powder, mass contact time were optimized determine adsorption capacity chromium rate. Adsorption...
<p>The fenvalerate pyrethroid insecticide was determined in various types of natural waters Senegal by means a newly-developed, simple, rapid and very sensitive photochemically-induced fluorescence (PIF) method. The PIF method optimized with respect to the irradiation time, solvent pH. obtained calibration curves yielded correlation coefficients close unity. limit detection (LOD) quantification (LOQ) values were low (LOD = 0.01–0.66 ng/ml LOQ 0.04–2.20 ng/ml, according solvent),...
Flumethrin and tau-fluvalinate pyrethroid insecticides were determined in natural water using photochemically induced fluorescence (PIF). As these pesticides are not naturally fluorescent, PIF ultraviolet irradiation was employed to produce highly fluorescent derivatives. This method optimized for interval, solvent pH. The calibration curves linear with limits of detection (LOD) from 0.5 73.8 ng mL−1 without matrix effects. Applications carried out aqueous solutions on tap water, seawater,...
Tau -fluvalinate and inclusion example in β-cyclodextrin.
<p>A direct spectrofluorimetric method for the quantitative analysis of benomyl in natural waters is described. Benomyl an instable, fluorescent fungicide that mainly decomposes into carbendazim and n-butyl-isocyanate organic aqueous solutions. The kinetics solvolysis reactions were investigated solvents (methanol acetonitrile) solvent systems, including β–cyclodextrin (β-CD), sodium dodecyl sulfate (SDS), dodecyltrimethylammonium chloride (DTAC), cetyltrimethylammonium (CTAC),...
A spectrofluorimetric method for the direct analysis of carbendazim [methyl 2-benzimidazole carbamate (MBC)] fungicide and its metabolite 2-aminobenzimidazole (2-AB) in natural waters is described. Very low limit detection (LOD) quantification (LOQ) values 0.002 - 0.06 ng/mL 0.006 0.2 ng/mL, respectively, were determined by with small relative standard deviation (RSD) < 1%. This was applied to determination MBC 2-AB residues waters, satisfactory recovery (88.5% 119.2%).
Abstract Diflubenzuron (DFB) and fenuron (FEN) are benzoylurea phenylurea pesticides, widely used in Senegal, that do not exhibit any natural fluorescence, but can be determined by means of photoinduced fluorescence (PIF) methods. Photodegradation DFB FEN yielded a number fluorescent non‐fluorescent photoproducts. For both at least 10 photoproducts were detected identified gas chromatography–mass spectrometry (GC/MS). To identify the formed photoproducts, their spectra compared with those...
This paper describes two prototypes of an on-site Early Warning Water Quality Monitoring System (EWWQMS) for pesticide quantification in natural waters.
Aromatic pesticides are toxic substances for the environment and humans. In this study, photodegradation kinetics, rate of leach ability in soils analytical determination diuron metalaxyl residues well water by liquid-liquid extraction procedure have been determined UV-visible absorption photochemically-induced fluorescence (PIF). We studied kinetics spectroscopy a second-order with lifetime values 6.0 0.5 hours was found diuron, respectively. Physicochemical parameters affecting sensitivity...
The photolysis of fenvalerate, a pyrethroid insecticide, was studied in acetonitrile by 1H nuclear magnetic resonance (NMR) and 13C NMR to identify the site bond cleavage gas chromatography-mass spectrometry (GC-MS) establish chemical structure fenvalerate photoproducts. Ultraviolet (UV) irradiation solutions performed for 18 h with solar light simulator, reaction obeyed first-order kinetics. Photolysis half-life time (t1/2) values ranged between 15.25 21.63 (mean photodegradation percentage...
A simple and sensitive thermochemically induced fluorescence (TIF) method was developed to determine deltamethrin, an insecticide which has toxic effects on human beings animals. After optimisation at different pH, temperature increased from 25 50°C. TIF is based the thermolysis transformation of naturally non-fluorescent pesticides into a fluorescent thermoproduct. The kinetics reaction investigated in water optimal pH 12 after 4 minutes heating 40°C made it possible obtain low mean...
• ME-TIFD signal improvement stabilized was highlighted. A Benesi-Hildebrand highly-trained version for method reliability used. Significant in analytical parameters from TIFD to methods. SPE/ME-TIFD application optimizes the MET recovery data spiked waters. sensitive micellar-enhanced thermochemically induced fluorescence derivatization (ME-TIFD) a rapid determination of metolachlor (MET) residues based on O -phthalaldehyde (OPA)-thermoproduct complex (OPA-MET) investigated. Both SDS and...
Dissociation constant, solubility, and thermodynamic data are very important physicochemical parameters for biological substances their knowledge is of fundamental importance the validation drugs. In addition to low cost accessibility, Conductometric pH-metric methods seem be particularly suitable determination these given often weak acidic or basic nature These were determined a new synthesized diisopropylammonium hydrogenmaleate (iPr2NH2-MA) crystalline molecule. used this...
The effect of adding organized supramolecular systems such as -cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) upon the photochemically-induced fluorescence (PIF) spectral properties tau-fluvalinate (TFV) in aqueous solutions were examined. influence pH, UV irradiation time photoproduct stability on cyclodextrin-enhanced intensity was also investigated. changes associated with inclusion process yielded values for formation constants TFV complexes between 450 640 M-1,...