Redox-Based Electrochemical Affinity Sensor for Detection of Aqueous Pertechnetate Anion.
ACS Sens
; 5(3): 674-685, 2020 03 27.
Article
em En
| MEDLINE
| ID: mdl-32028765
ABSTRACT
Rapid, selective, and in situ detection of pertechnetate (TcO4-) in multicomponent matrices consisting of interfering anions such as the ubiquitous NO3- and Cl- or the isostructural CrO42- is challenging. Present sensors lack the selectivities to exclude these interferences or the sensitivities to meet detection limits that are lower than the drinking water standards across the globe. This work presents an affinity-based electrochemical sensor for TcO4- detection that relies on selective reductive precipitation of aqueous TcO4- induced by a 1,4-benzenedimethanethiol capture probe immobilized on an electrode platform. This results in a direct decrease in the electron transfer current, the magnitude of the decrease being proportional to the amount of TcO4- added. Using this approach, a detection limit of 1 × 10-10 M was achieved, which is lower than the drinking water standard of 5.2 × 10-10 M set by United States Environmental Protection Agency. The proposed approach shows selectivity to the TcO4- anion, allowing detection of TcO4- from a multicomponent groundwater sample obtained from a well at the Hanford site in Washington (well 299-W19-36) that also contained NO3-, Cl-, and CrO42-, without discernably affecting the detection limits.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
/
Pertecnetato Tc 99m de Sódio
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
ACS Sens
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Estados Unidos