Highly sensitive, selective and naked-eye detection of bromide and bromate using distance-based paper analytical device.
Talanta
; 221: 121590, 2021 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-33076125
ABSTRACT
Bromine (Br) can usually be found as a bromide (Brâ¾) form contained in drinking water. Bromate (BrO3â¾) formation often occurred during the ozonation process in the presence of Brâ¾. BrO3â¾ is classified as a potential human carcinogen, so both the Brâ¾ and BrO3â¾ concentrations must be strictly controlled before and after an ozone-based treatment procedure, respectively. This work reports on distance-based paper analytical devices (dPADs) that have been modified with silver hexagonal nanoprisms (AgNPrs) for highly sensitive and selective determination of both Brâ¾ and BrO3â¾. The measurement of BrO3â¾ is based upon its conversion to bromine vapor (Br2) when gauged with a paper-based headspace extractor (PAD-HS) that is coupled with dPADs (PAD-HS-dPADs). For Brâ¾ analysis, O2 plays an important role in the change from Brâ¾ to Br2 within an acid media. Br2 changes rapidly in water to give us HBrO which is a strong oxidizing agent of AgNPrs. Then, the oxidative reaction of the AgNPrs (pink color) within the presence of Brâ¾ and BrO3â¾ establishes both silver bromide (AgBr) and the silver nanosphere (AgNPs, yellow color), which can then be easily observed as a change of a pink color band to a yellow color band by the naked eye. Quantification of Brâ¾ and BrO3â¾ is then achieved by measuring the length of the yellow color band. Under the optimal conditions, the calibration curve will be linear in the range of 25 µg L-1 to 2 mg L-1, and from 0.5 to 50 µg L-1 for Brâ¾ and BrO3â¾, respectively. The naked-eye detection limits were found to be 10 and 0.5 µg L-1 for Brâ¾ and BrO3â¾, respectively. The proposed dPADs for the Brâ¾ and BrO3â¾ detection exhibited an exceptional sensor performance combined with a low detection limit. They also have the benefits of ease of use, an instrument-free convenience, coupled with portability and a low-cost efficiency. Consequently, our sensing device should be applied to the low-level detection of Brâ¾ and BrO3â¾ in real samples, including drinking water, rice, and flour.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article