Amperometric sensor for nitrite based on copper tetrasulphonated phthalocyanine immobilized with poly-L-lysine film.
In this work, an amperometric sensor for nitrite detection based on a glassy carbon electrode modified with copper tetrasulphonated phthalocyanine immobilized by polycationic poly-L-lysine film is presented. The modified electrode showed an excellent catalytic activity toward nitrite oxidation. A linear response range from 0.12 up to 12.20 micromol L(-1) was obtained with a sensitivity of 0.83 microA L micromol(-1). The detection limit for nitrite was 36 nmol L(-1). The repeatability of the proposed sensor, evaluated in terms of relative standard deviation, was 1% for 10 measurements of 10 micromol L(-1) nitrite solution. Finally, the developed sensor was applied for nitrite determination in water samples and the results were in agreement to the comparative method. The average recovery for the samples was 101 (+/-4)%.
Sousa
Aline L
AL
Center of Sciences and Technology, UFMA, Avenida dos Portugueses s/n, 65085-580 São Luís, MA, Brazil.
Santos
Wilney J R
WJ
Luz
Rita C S
RC
Damos
Flavio S
FS
Kubota
Lauro T
LT
Tanaka
Auro A
AA
Tanaka
Sônia M C N
SM