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17. Liquid Phase Microextraction of Chloridazon from Environmental Water and Soil Samples by Supramolecular Solvent-Impregnated TiO.sub.2 Coated Polypropylene Hollow Fibers

Author

Shahrezaei, Fatemeh, Gholivand, Mohammad Bagher, and Shamsipur, Mojtaba

Subjects
Polypropylene, Infrared spectroscopy, Herbicides, Water, Underground, Chemistry
Abstract

Human populace is always exposed to various hazardous species in nature. Herbicides, due to their broad use in agriculture, are widely found in surface and ground waters. The purpose of this study was to evaluate the application of TiO.sub.2 modified polypropylene hollow fibers for liquid phase microextraction of chloridazon by supramolecular solvent. Scanning electron microscopy and Fourier transform infrared spectroscopy survey proved the incorporation of TiO.sub.2 nanoparticles into the hollow fibers. The impact of extraction time, stirring speed, ionic strength, pH and volume on the extraction of chloridazon was evaluated. Under optimal conditions, chloridazon present in 10 mL of the aqueous solution was extracted in 5 [micro]L of the acceptor phase with recovery up to 90% and detection limits of 0.4 [mu]g/L. Applicability of the method was tested by chloridazon extraction and monitoring in real samples with relative recovery exceeding 92%. This novel approach is simple, cost-effective and applicable for detecting herbicides in the environment., Author(s): Fatemeh Shahrezaei [sup.1] [sup.2], Mohammad Bagher Gholivand [sup.1], Mojtaba Shamsipur [sup.1] Author Affiliations: (1) grid.412668.f, 0000 0000 9149 8553, Department of Analytical Chemistry, Faculty of Chemistry, Razi University, , [...]

Published
2021
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27. A Selective Fluorescent Optode for Lead(II) Based on the Dansylamidopropyl Pendant Arm Derivative of 1,4-Dioxa-7,13-dithia-10-azacyclopentadecane ([15]aneNS 2 O 2).

Author

Shamsipur, Mojtaba, Mohammadi, Moslem, Arca, Massimiliano, Garau, Alessandra, Lippolis, Vito, and Barati, Ali

Subjects
STABILITY constants, TUNA, TUNA fishing, DETECTION limit, FLUORESCENCE spectroscopy, POLYVINYL chloride, FLUOROPOLYMERS
Abstract

In this study, a novel highly sensitive and selective fluorescent optode membrane aimed at the determination of Pb(II) ion is proposed by incorporating N-(3-(1,4-dioxa-7,13-dithia-10-azacyclopentadecan-10-yl)propyl)-5-(dimethylamino)naphthalene-1-sulfonamide (L) as fluoroionophore in polyvinyl chloride (PVC) containing 2-nitrophenyl octylether (NPOE) as a plasticizer. In addition to high stability and reproducibility, the proposed optosensor showed a unique selectivity toward Pb(II) ion, with a wide linear range of molar concentrations (1.0 × 10−9–1.0 × 10−3 M) and a low detection limit of 7.5 × 10−10 M in solution at pH 5.0. The formation constants of the Pb(II) complexes with the fluoroionophore were evaluated by fitting the fluorescence data with a nonlinear least-squares curve-fitting program, and further information about the structures of the complexes were evaluated based on hybrid-DFT calculations. The optosensor exhibited a fast response time of less than three min, being easily regenerated by exposure to a solution of dithiothreitol. The sensor was applied to the determination of Pb(II) in real samples (canned tuna fish), and it provided satisfactory results comparable to those obtained via atomic absorption spectrometry (AAS). [ABSTRACT FROM AUTHOR]

Published
2023
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33. Fabrication of a highly sensitive and selective electrochemical sensor based on chitosan-coated [Fe.sub.3][O.sub.4] magnetic nanoparticle for determination of antibiotic ciprofloxacin and its application in biological samples

Author

Dehdashtian, Sara, Bagher Gholivand, Mohammad, Shamsipur, Mojtaba, Azadbakht, Azadeh, and Karimi, Ziba

Subjects
Electrochemical analysis -- Equipment and supplies, Nanoparticles -- Usage -- Magnetic properties, Chitin -- Usage, Iron oxides -- Usage, Chemical detectors -- Production processes, Ciprofloxacin -- Chemical properties, Chemistry
Abstract

Abstract: A simple and sensitive sensor has been developed for the electrochemical determination of ciprofloxacin (CF). The proposed sensor was designed by chitosan-coated [Fe.sub.3][O.sub.4] magnetic nanoparticle incorporated in the carbon [...]

Published
2016
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