Electrochemical Determination of Nitrite Based on Gd Doped Nano Titanium Dioxide-Modified Gold Electrode
A simple and reliable method for electrochemical determination of nitrite based on Gd doped nano titanium dioxide (Gd-nano-TiO2) modified gold electrode was well developed in this paper. Using cyclic voltammetry, the modified electrode shows electrocatalytic activity for oxidation of nitrite in 0.10 mol×L-1 sulfuric acid solution (pH=0.70). The catalytic peak current was found to be linear with nitrite concentration in the range of 2.0´10-6 ~ 2.0´10-4 mol×L-1, with a detection limit of 1.1´10-6 mol×L-1 (S/N=3). Compared with spectrophotometry, the Gd-nano-TiO2 modified Au electrode could be used for the determination of nitrate in the ham sausage samples with a satisfactory recovery of 95.9 ~ 103.2%, showing its promising application in safety evaluation for food.
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
M. L. Zhang et al., "Electrochemical Determination of Nitrite Based on Gd Doped Nano Titanium Dioxide-Modified Gold Electrode", Advanced Materials Research, Vols. 239-242, pp. 2046-2049, 2011