Electrochemical determination of nitrite in water samples using a glassy carbon electrode modified with didodecyldimethylammonium bromide

The oxidative electrochemistry of nitrite was investigated using a glassy carbon electrode modified with surfactants such as didodecyldimethylammonium bromide (DDAB), Tween-80, and sodium dodecylbenzenesulfonate, respectively. Nitrite oxidation proceeds best in the presence of DDAB. The electrode exhibited good sensitivity and fast response, with a linear dynamic range between 1.0 and 80 mu M of nitrite, and a sensitivity of 0.04 A mu A center dot A mu M-1. The electrode was successfully applied to the determination of nitrite in spiked real water samples.