A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)
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- CARVALHIDO Joana A. E.
- REQUIMTE, Dep. Química-Física Fac. Farmácia U. P.
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- ALMEIDA Agostinho A.
- REQUIMTE, Dep. Química-Física Fac. Farmácia U. P.
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- ARAÚJO Alberto N.
- REQUIMTE, Dep. Química-Física Fac. Farmácia U. P.
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- MONTENEGRO Maria C. B. S. M.
- REQUIMTE, Dep. Química-Física Fac. Farmácia U. P.
Bibliographic Information
- Other Title
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- A reflectance flow-through thionine sol-gel sensor for the determination of Se(4)
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Description
In this work, a reversible sensor to assess the total Se(IV) content in samples is described. Pre-activated glass slides were spin-coated with 100 μL of a 20-h aged sol-gel mixture of 1 mL of tetramethoxysilane, 305 μL of 50 mmol L−1 HCl and 2.0 mg of thonine. The flow-cell consisted of one of those slides as a window, and was filled with beads of a polystyrene anionic exchange resin to retain Se(IV) in the form of selenite ions. A reflectance transduction scheme at a wavelength of 596 nm was adopted. The cell was coupled to a multicommutation flow system where a programmed volume of a sample solution and 373 μL of 0.4 mmol L−1 iodide in a 1.6 mol L−1 HCl solution were sequentially inserted into the cell. The iodine produced from the reaction of retained Se(IV) with iodide bleached the blue color of thionine. Considering a sample volume of 2.30 mL, with which the preconcentration step was minimized, a linear dynamic working range between 1.5 to 20 μg mL−1 and a detection limit of 0.29 μg mL−1 were obtained. The sensor enabled us to perform approximately 200 assays, and provided results similar to those of electrothermal atomic absorption spectrometry.
Journal
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- Analytical Sciences
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Analytical Sciences 26 (6), 665-669, 2010
The Japan Society for Analytical Chemistry
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Details 詳細情報について
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- CRID
- 1390001204256612736
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- NII Article ID
- 10026784018
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- NII Book ID
- AA10500785
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- ISSN
- 13482246
- 09106340
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- NDL BIB ID
- 10703977
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed