Development of on-line spectrofluorimetric methodology for selenium monitoring in foods and biological fluids using Chrome azurol S quenching

A modified selective optical sensor for selenium determination based on incorporating xylenol orange in a poly(vinyl chloride) membrane

“…The low concentration of each species to be identied and the intricacy of the matrix are factors in many selenium speciation analysis issues. 12,13 Various instrumental analytical techniques such as atomic absorption spectroscopy (AAS), [14][15][16][17] atomic uorescence spectroscopy (AFS), 18 hydride generation atomic uorescence spectrometry (HGAFS), 19 electrothermal atomic absorption spectrometry (ETAAS), 20 inductively coupled plasma optical emission spectrometry (ICP-OES), 21 hydride generation system and atomic uorescence spectrometer (HG-AFS), 22 hydride generation atomic uorescence spectrometer (HG-AFS), 23 integrated coupled plasma mass spectroscopy, 24 inductively coupled plasma mass spectrometry (ICP-MS), 25,26 spectro-uorimetry, 27,28 and stripping voltammetry 29 were used for the determination of selenium in different water, food, and environmental samples. A comprehensive evaluation of these advanced instrumental approaches includes disadvantages related to these techniques, such as expensive investment costs, signicant electricity consumption during continuous analysis, the requirement for frequent maintenance of these instruments, and laborious analytical methodology.…”

“…38 Furthermore, they are not impacted by electrical noise and do not require internal or external reference devices and extended preconditioning times. 39 The advantages of optical sensor methodology have attracted the attention of the scientic community, as they allow the development of low-cost or costcompetitive systems with faster response times and a wider nano-concentration range and low detection and quantication limits compared with conventional technologies, [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][36][37][38][39] in addition to the ability to detect specic oxidation states compared to the AAS and ICP-MS methods. [14][15][16][17][18][19][20][21][22][23][24][25][26] The membrane optode matrix is chosen based on analyte permeability, good mechanical properties, plasticizability, affordability, ease of miniaturization and remote sensing, suitability for immobilizing the chromophore and extractant, and minimal sample manipulation.…”

“…38 Furthermore, they are not impacted by electrical noise and do not require internal or external reference devices and extended preconditioning times. 39 The advantages of optical sensor methodology have attracted the attention of the scientific community, as they allow the development of low-cost or cost-competitive systems with faster response times and a wider nano-concentration range and low detection and quantification limits compared with conventional technologies, 14–29,36–39 in addition to the ability to detect specific oxidation states compared to the AAS and ICP-MS methods. 14–26…”

Spectrophotometric Determination of Copper(II) using 2,2[O-Tolidine-4,4-bis azo]bis[4,5-diphenyl imidazole](MBBAI)

“…Copper (II) is a heavy metal which can pollute the environments widely when released from industry and agriculture for this reason, there has been an interest by the researcher in studying quantitative estimation methods of copper(II) (1).Spectroscopic methods are one of the most famous methods to determined trace amount of metal in their complexes. It is cheap, simple and has an excellent sensitivity (2). Copper is a fundamental follow supplement to plant and life of the creatures.…”

Ultrasonic assisted deep eutectic solvent liquid–liquid microextraction using azadipyrromethene dye as complexing agent for assessment of chromium species in environmental samples by electrothermal atomic absorption spectrometry

“…Now a days there is an enhancing interest to found a simple, reliable and accurate procedure for the chromium ions speciation in water samples . In order to determine the species of chromium ion in water and other samples, extraction techniques and/or sample preparation methods are necessary for inductively coupled plasma optical emission spectrometry (ICP‐OES), flame atomic absorption spectrometry (FAAS), graphite furnace atomic absorption spectrometry (GFAAS), high pressure liquid chromatography (HPLC), ultraviolet visible spectrophotometry (Uv–vis), spectrofluorometry and gas chromatography (GC) . These methods suffer from a number of pitfalls.…”