A5041044858- Electrochemical Analysis and Applications
- Analytical chemistry methods development
- Analytical Chemistry and Sensors
- Arsenic contamination and mitigation
- Electrochemical sensors and biosensors
- Mercury impact and mitigation studies
- Radioactive element chemistry and processing
- Conducting polymers and applications
- Electrocatalysts for Energy Conversion
- Molecular Sensors and Ion Detection
- Heavy metals in environment
- Marine and coastal ecosystems
- Chemical and Physical Properties in Aqueous Solutions
- Thallium and Germanium Studies
- Advanced biosensing and bioanalysis techniques
- Advanced battery technologies research
- Lanthanide and Transition Metal Complexes
- Chemical Synthesis and Characterization
- Pesticide Residue Analysis and Safety
- Heavy Metal Exposure and Toxicity
- Atmospheric chemistry and aerosols
- Effects and risks of endocrine disrupting chemicals
- Water Quality Monitoring and Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Inorganic and Organometallic Chemistry
Ferdowsi University of Mashhad
2012-2022
Islamic Azad University, Mashhad
2017-2020
University of Southampton
1979-1998
A technique for the determination of "inorganic" arsenic(III) and arsenic(V), "methylarsenic" "dimethylarsenic" species is described which based on trapping arsines selective volatilisation into a heated quartz atomiser tube situated in optical path an atomic-absorption spectrometer. Improved reproducibility obtained by use continuous flow reduction stage detection limits are approximately 0.25 ng (based twice standard deviation 10 blank measurements). For typical sample volume ml this...
A novel and extremely highly sensitive method for extraction determination of arsenic in aqueous samples by headspace liquid phase microextraction combined with graphite furnace atomic absorption spectrometry is described. The species were converted to arsine 3 mol dm−3 HCl sample solution sodium tetrahydroborate (NaBH4) a closed vial during the 7 min time at 35 °C it was reacted AgDDC dissolved 4 µl microdrop mixture 1∶3 pyridine∶benzyl alcohol suspended tip microsyringe. After equilibrium...
An automated procedure for the determination of soluble arsenic, using hydride generation atomic-absorption spectroscopy, is described and optimised operating conditions are derived. Interferences observed in presence silver(I), gold(III), iron(III), platinum(IV), antimony(III), strontium(II), fluoride sulphide but can be overcome by suitable pretreatment procedures. The detection limit (based on twice standard deviation 15 blank measurements) 0.90 ng ml–1 arsenic arsenic(III), arsenic(V)...
The silver diethyldithiocarbamate spectrophotometric procedure for the determination of arsenic has been modified to perform differential inorganic arsenic(III) and arsenic(V) species. Based on pH control reduction characteristics borohydride ion, arsine is generated at 6 from arsenic(III); following acidification, then trapped appropriate 2–40 µg each Antimony(III), bismuth(III), chromium(VI), copper(II), gold(III), nickel(II), platinum(IV), silver(I), tellurium(IV) tin(II) interfere in...
A novel, sensitive and inexpensive supramolecular dispersive liquid–liquid microextraction method based on the solidification of floating organic drops (SM-DLLME-SFO) has been proposed for speciation preconcentration trace quantities chromium as a precursor to its determination by UV-Vis spectrophotometery first time. The ions are micro-extracted with coacervates composed reverse micelles formed using decanoic acid dispersed in tetrahydrofuran–water mixtures. THF plays double role,...
The authors report arsenic phytoremediation by the common reed, Phragmites australis (P. australis). plants for this study were collected from five sampling sites in Chelpo contaminated area of Khorasan Province Northeast Iran. P. was found to be a hyper‐accumulator plant. Because potential plant used as an agent remove polluted environment, has considerable enrichment factor. Thus, accumulation model following order root>rhizome>stem>leaves, examination process indicates that species can...
A simple microextraction method based on solidification of a floating organic drop (SFOD) was developed for preconcentration lead prior to its determination by electrothermal atomic absorption spectrometry (ETAAS). Ammonium pyrolidinedithiocarbamate (APDC) used as complexing agent, and the formed complex extracted into 20 μL 1-undecanol. The diluted with ethanol injected graphite furnace. An orthogonal array design (OAD) OA16 (45) matrix employed study effects different parameters such pH,...