A5045975035- Analytical chemistry methods development
- Electrochemical Analysis and Applications
- Mercury impact and mitigation studies
- Pesticide Residue Analysis and Safety
- Advanced Chemical Sensor Technologies
- Radioactive element chemistry and processing
- Heavy metals in environment
- Water Quality and Pollution Assessment
- Radioactive contamination and transfer
- Mass Spectrometry Techniques and Applications
- Ion-surface interactions and analysis
- Nuclear Physics and Applications
- Radioactivity and Radon Measurements
- Selenium in Biological Systems
- Carbon Nanotubes in Composites
- Water Quality Monitoring and Analysis
- Cultural Heritage Materials Analysis
- Chemical Analysis and Environmental Impact
- Catalytic Processes in Materials Science
- Adsorption and biosorption for pollutant removal
- Graphite, nuclear technology, radiation studies
- Toxic Organic Pollutants Impact
- Radical Photochemical Reactions
- Oxidative Organic Chemistry Reactions
- Mycotoxins in Agriculture and Food
National Research Council Canada
2011-2023
VF Calibration Laboratory (Czechia)
2021
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2021
National Metrology Centre
2020
National Academies of Sciences, Engineering, and Medicine
2003-2015
Pontifical Catholic University of Rio de Janeiro
2001-2007
Possible mechanisms are advanced to account for a number of observations/phenomena associated with the production volatile metal species arising from photochemical vapor generation in acetic and formic acid media. These systems include mercury, iodine, selenium, iron nickel as test cases which generate cold vapor, hydrides, methylated carbonylated species. A model, based on free radicals involving ligand charge transfer reductions oxidations, is consistent majority experimental data,...
This work explores the possibilities of solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry for direct analysis carbon nanotubes. In particular, simultaneous determination Co, Fe, Ni and Pb is intended, as these elements are typically found in samples impurities. The results demonstrate that it possible to find spectral (monitoring region between 283.168 283.481 nm), (2500 °C atomization; use 100 ng Pd a chemical modifier) detector (use side pixels...
Main text KRISS and NMIJ jointly coordinated the CCQM-K158 comparison on elements inorganic As in polished rice flour. The study comprised two parts, Part A B. Successful participation formal international comparisons is essential for documenting calibration measurement capability claims (CMCs) by national metrology institutes (NMIs) designated (DIs). specifically supports CMCs within food category, corresponding to sample matrix labeled "High organic content" new CC table broad claims....
An effective approach to the digestion of fluoropolymers for determination Ag, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, and Ni impurities has been developed using microwave-induced combustion (MIC) in closed quartz vessels pressurized with oxygen. Samples that were examined included following: polytetrafluorethylene (PTFE); polytetrafluoroethylene an additional modifier, perfluoropropylvinylether (PTFE-TFM); fluorinated ethylene propylene (FEP). A device was used as a sample holder, influence...
An optimized photochemical vapor generation (PVG) approach for efficient synthesis of volatile cobalt species is described.
A systematic evaluation of UV-photochemical generation volatile iodine species for detection by ICP-MS is described. Several UV-based systems were studied, the most advantageous design being a modified cyclonic spray chamber fitted with 6 W mercury pen lamp supplying 1 ml min−1 sample to glass concentric nebulizer. Optimal conditions utilized 5% v/v solution acetic acid as medium. The presence UV field enhanced signal intensity approximately 40-fold, providing (blank limited) limit 0.7 pg...
Generation of volatile cobalt carbonyl was accomplished by exposing a solution inorganic cobalt, containing low molecular weight organic acids, to UV irradiation. The gaseous products were removed from the liquid phase in gas–liquid separator and transported Pyrex U-tube cryogenic trap. Following cryocondensation using dry ice–acetone bath, placed hot water bath (35–40 °C) trapped species introduced an ICP-MS for estimation efficiency generation. Alternatively, gas Co sampled with gastight...
Photochemical generation of a volatile molecular Cd species from an acetic acid medium was accomplished using thin film generator comprising 20 W low pressure UV source. Argon gas used to sweep the product vapor quartz tube atomizer heated 900 °C. No signal generated below about 770 °C and optimum atomization conditions required addition 10% hydrogen Ar transfer gas, indicative thermochemical process similar that undergone for metal hydrides. efficiency exceeded 90% but analyte detector...
Photochemical vapor generation of inorganic Hg is proposed for its determination in high-salinity production water obtained from offshore petroleum exploration.
Photochemical vapor generation of Os. OsO 4 oxidative product from photolysis 5% HNO 3 medium; reductive 1% acetic acid/50 mg L −1 Fe 3/2+ an uncharacterized organometallic Os compound [Os w (CO) x (CH ) y H z ] detected by ICP-MS.
Several derivatizing agents were evaluated for use in speciating mercury biological samples using solid phase microextraction conjunction with tandem gas chromatography-furnace atomization plasma emission spectrometry (SPME-GC-FAPES). Following digestion methanolic potassium hydroxide, the pH of was adjusted and NaCl added when necessary. The species then derivatized sodium tetraphenylborate or tetrapropylborate extracted by SPME a 100 µm PDMS coated fiber. separated GC detected FAPES. All...
Quantitative photochemical destruction of nitrate in an alkaline hydrazine medium followed by removal nitrite with sulfamic acid acidic permits interference-free vapor generation dimethylselenide from dilute acetic acid.
Environmental context Arsenic can be found in all environmental compartments a large number of chemical forms varying toxicity. We performed an inter-laboratory comparison study focusing on quantitation some the most toxic arsenic seven different biological materials and very good agreement among submitted results. Certification studied will provide suitable quality control samples for environmentally relevant concentrations food products biota.Rationale (As) speciation analysis matrices has...