Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1243033 | Talanta | 2010 | 9 Pages |
Abstract
A nitrite sensor based on immobilized Dawson-type tungstophosphate α-K7[H4PW18O62]·18H2O (PW18) in multilayers of charged polyelectrolyte poly(allylamine hydrochloride) (PAH) on a glassy carbon electrode is described. A nitrite sensor manufactured with 10 layers has a sensitivity of ∼4 nA/μM nitrite, fast response time (<6 s), low detection limit (∼0.1 μM), high selectivity towards endogenous interferences such as nitrate and molecular oxygen, a linear range from 0.1 μM to at least 20 mM nitrite and was stable for at least 2 months. In addition, such nitrite sensors can operate in a pH range from 1 to 9, and the sensitivity can be increased by increasing the number of layers at the expense of increasing the response time.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Malika Ammam, Bineta Keita, Louis Nadjo, Jan Fransaer,