Selenium analysis by an integrated microwave digestion-needle trap device with hydride sorption on carbon nanotubes and electrothermal atomic absorption spectrometry determination

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

“…The results of an analysis of the above samples (Table 6) compare favorably with those from the ETAAS method. 20 The performance of the proposed sensor was assessed using the t-value (for accuracy) and F-test (for precision) compared with the ETAAS method. 20 The mean values were obtained by a Student's t-test and F-test at 95% condence limits for ve degrees of freedom.…”

“…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.…”

“…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. [40][41][42] Polyvinyl chlorides are the most oen utilized polymers in optical sensors.…”

Determination of selenite and selenomethionine in kefir grains by reversed‐phase high‐performance liquid chromatography–inductively coupled plasma‐optical emission spectrometry

“…The daily intake of selenium for adults has been recommended as 55 µg and another limit concentration for selenium has been suggested as 40 µg/L by the World Health Organization [5]. Selenium plays a key role in thyroid hormone metabolism, reproductive system, antioxidant defense [6], growth‐development process, reduction of cancer risk [7], redox control of intracellular reactions [2], and enhancement of immune system [8]. On the other hand, its excess amounts cause to several problems such as nail deformation, nausea, hair loss, and fatigue [8].…”

“…In literature, various instrumental methods such as inductively coupled plasma mass spectrometry (ICP‐MS) [37,38], inductively coupled plasma optic emission spectrometry (ICP‐OES) [39,40], electrothermal atomic absorption spectrometry (ETAAS) [6,41], and hydride generation‐flame atomic absorption spectrometry (HG‐FAAS) [42,43] have been used for the determination of selenium in different sample matrices. The determination of different chemical forms of elements at various concentrations is carried out in order to explain their toxicity, bioavailability, actual distribution, and bioaccumulation [44].…”