Nitrite sensor based on multilayer film of Dawson-type tungstophosphate α-K-7[H4PW18O62].18H(2)O immobilized on glassy carbon
- Ammam, Malika
- Keita, Bineta
- Nadjo, Louis
- Fransaer, Jan
DOIAbstract
A nitrite sensor based on immobilized Dawson-type tungstophosphate alpha-K-7[H4PW18O62] 18H(2)O (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 similar to 4 nA/mu M nitrite, fast response time (<6 s), low detection limit (similar to 0.1 mu M), high selectivity towards endogenous interferences such as nitrate and molecular oxygen, a linear range from 0 1 mu M 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 r...
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