Results 41 to 50 of about 23,617 (221)
Advances in Sample Preparation, 2023 In recent years, electromembrane microextraction techniques have been used widely for the analysis of chromium species (trivalent and hexavalent chromium) in different environmental matrices.
Waleed Alahmad +2 more
doaj +1 more source
Molecules, 2014 Solvent extraction remains one of the fundamental sample preparation techniques in the analysis of environmental solid samples, but organic solvents are toxic and environmentally harmful, therefore one of the possible greening directions is its ...
Helena Prosen
doaj +1 more source
New sorbents for extraction and microextraction techniques
Journal of Chromatography A, 2010 This review outlines recent progress in the research on some new classes of sorbents for extraction and microextraction techniques. Carbon nanotubes are allotropes of carbon with cylindrical structure. They are very stable systems having considerable chemical inertness due to the strong covalent bonds of the carbon atoms on the nanotube surface.
Fabio, Augusto +5 more
openaire +2 more sources
Microextraction Techniques in Illicit Drug Testing: Present and Future [PDF]
Bioanalysis, 2016 Sample preparation is of utmost importance in both qualitative and quantitative analysis of illicit drugs because complex matrices, such as biological specimens, are involved in the assay. In forensic toxicology, the analysis is typically performed on biological fluids such as urine, serum and plasma.
Montesano, Camilla, Sergi, Manuel
openaire +2 more sources
Analysis &Sensing, EarlyView.The U‐shaped electromembrane extraction with liquid chromatography‐mass spectrometry enables rapid multiclass pesticide screening in soil. The 15 min, low‐solvent workflow achieves high recoveries and robust linearity, while AGREEprep and GAPI assessments highlight a greener profile compared to literature reports, which represents a smart strategy for ...
Rafael O. Martins +9 more
wiley +1 more source
Experimental methods in chemical engineering: Atomic absorption spectrometry—AAS
The Canadian Journal of Chemical Engineering, EarlyView.Abstract Elements absorb electromagnetic radiation (light) of a specific wavelength in proportion to the number of atoms in its path. As the atoms absorb this light energy, electrons rise from the ground state to an excited state. In atomic absorption spectrometry (AAS), high temperatures produce clouds of atoms from the sample (atomization) and ...
Emily Cintia Tossi de A. Costa +4 more
wiley +1 more source
Headspace analysis of natural yoghurt using headspace solid phase microextraction : a thesis presented in partial fulfilment of the requirements for the degree of Master of Philosophy in Food Technology at Massey University (Turitea Campus), Palmerston North, New Zealand [PDF]
, 2001 The Solid Phase Microextraction (SPME) method was originally developed to extract volatile and semivolatile compounds from wastewater samples but has since been applied to flavour compounds in foods and beverages.
Sivalingam-Reid, Geedha
core
Tungsten coil atomic emission spectrometry combined with dispersive liquid–liquid microextraction: A synergistic association for chromium determination in water samples [PDF]
, 2016 A novel and environment friendly analytical method is reported for total chromium determination and chromium speciation in water samples, whereby tungsten coil atomic emission spectrometry (WCAES) is combined with in situ ionic liquid formation ...
Canals, Antonio +3 more
core +2 more sources
Microextraction techniques combined with capillary electrophoresis in bioanalysis [PDF]
Analytical and Bioanalytical Chemistry, 2012 Over the past two decades, many environmentally sustainable sample-preparation techniques have been proposed, with the objective of reducing the use of toxic organic solvents or substituting these with environmentally friendly alternatives. Microextraction techniques (MEs), in which only a small amount of organic solvent is used, have several ...
Kohler, Isabelle +2 more
openaire +4 more sources
ELECTROPHORESIS, EarlyView.A rapid and reliable SALLE–CZE–UV method was developed for the determination of phenolic preservatives in insulin formulations and human plasma. The approach provides efficient extraction, fast separation (< 6 min), and excellent sensitivity, precision, and recovery, meeting regulatory requirements for accurate quantification.
Meriem Dadouch +2 more
wiley +1 more source