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- Title
Colorimetric and electrochemical arsenate assays by exploiting the peroxidase-like activity of FeOOH nanorods.
- Authors
Zhong, Xiao-Li; Wen, Shao-Hua; Wang, Yi; Luo, Yu-Xi; Li, Zhi-Mei; Liang, Ru-Ping; Zhang, Li; Qiu, Jian-Ding
- Abstract
The authors describe an electrochemical and an optical method for the determination of As(V) by using iron oxyhydroxide (FeOOH) nanorods that display peroxidase-mimicking activity. The nanorods catalyze the oxidation of substrate ABTS by H2O2 to form a green product with an absorption maximum at 418 nm. If, however, As(V) is electrostatically adsorbed on the nanorods, the oxidation is gradually inhibited. A colorimetric assay was worked out based on these findings. Response is linear in the 0 to 8 ppb and 8 to 200 ppb As(V) concentration range, and the detection limit is 0.1 ppb. Even higher sensitivity is achieved in an electrochemical method which is based on the excellent electrical conductivity of FeOOH nanorods. Electrochemical analysis of As(V) was achieved by first adsorbing As(V) on the nanorods. This inhibits the ABTS reduction current signal, best measured at a potential of 150 mV (vs. Ag/AgCl). The linear range extends from 0.04 to 200 ppb, and the detection limit is as low as 12 ppt.
- Subjects
PEROXIDASE; ELECTROCHEMICAL analysis; ARSENATES; DETECTION limit; GREEN products; ELECTRIC conductivity
- Publication
Microchimica Acta, 2019, Vol 186, Issue 11, pN.PAG
- ISSN
0026-3672
- Publication type
Article
- DOI
10.1007/s00604-019-3863-1