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Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetite
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Document Title
Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetite
Author
Phouthavong V., Manakasettharn S., Viboonratanasri D., Buajarern S., Prompinit P., Sereenonchai K.
Name from Authors Collection
Affiliations
Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand; Department of Chemistry, Faculty of Natural Sciences, National University of Laos, P. O. Box 7322, Vientiane, Laos; National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Pathumthani, 12120, Thailand; Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs), Bangkok, Thailand
Type
Article
Source Title
Scientific Reports
ISSN
20452322
Year
2021
Volume
11
Issue
1
Open Access
Gold, Green
Publisher
Nature Research
DOI
10.1038/s41598-021-02516-4
Abstract
In this study, we customized magnetic sorbents by functionalizing silica coated magnetite with octadecyl(C18)silane (Fe3O4@SiO2@C18). This sorbent was intended for the determination of trace orthophosphate (o-PO43−) in unpolluted freshwater samples. The o-PO43− was transformed to phosphomolybdenum blue (PMB), a known polyoxometalate ion. Then the PMB were coupled with cetyl trimethyl ammonium bromide (CTAB), cationic surfactant, in order to hydrophobically bound with the Fe3O4@SiO2@C18 particles through dispersive magnetic solid-phase extraction (d-MSPE) as part of sample preconcentration. The PMB–CTAB–magnetic particles are simply separated from the aqueous solution by the external magnet. The acidified ethanol 0.5 mL was used as PMB-CTAB eluent to produce an intense blue solution, which the absorbance was measured using a UV–Vis spectrophotometer at 800 nm. The proposed method (employing 2 mg of Fe3O4@SiO2@C18) yielded an enhancement factor of 32 with a linear range of 1.0–30.0 µg P L−1. Precision at 6.0 µg P L−1 and 25.0 µg P L−1 were 3.70 and 2.49% (RSD, n = 6) respectively. The lower detection limit of 0.3 µg P L−1 and quantification limit of 1.0 µg P L−1 allowed trace levels analysis of o-PO43− in samples. The reliability and accuracy of the proposed method were confirmed by using a certified reference material. Our method offers highly sensitive detection of o-PO43− with simple procedures that can be operated at room temperature and short analysis time. © 2021, The Author(s).
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
Funding Sponsor
National Science and Technology Development Agency; Thammasat University; National Nanotechnology Center
License
CC BY
Rights
Author
Publication Source
Scopus
Document
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Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetiteDownload