A modified ZnO/CNTs nanocomposite ionic liquid carbon paste electrode as a sensor for nitrite determination

The presence of nitrite in groundwater and atmosphere is an essential precursor in the formation of nitrosamines, many of which have been proven to be powerful carcino- gens [1, 2]. Theincrease in nitrite concentration in the blood causes a decrease in oxygen transport by the blood causing methemoglobinemia, better known as the blue baby syndrome reaction of nitrite with Fe (II) forming hemoglobin to methemoglobin, HbFe (III) [3]. For these reasons, determination of nitrite has received consider-able attention. A fast and simple voltammetric method based on the use of ZnO/CNTs nanocomposite/ionicliquids carbon paste electrode is proposed for the determination of nitrite. In the first step, we describe synthesis and characterization of ZnO/CNTs nanocomposite with different methodssuch as transmission electron microscopy (TEM) (Fig. 1). In the second step, application of the synthesis ZnO/CNTs nanocomposite describes for the preparation of carbon paste electrode modified with ionic liquids as a binder for voltammetric determination of nitrite in food samples.The peaks current of square wave voltammograms (SWV) of nitrite increased linearly with theirconcentration in the ranges of 0.1–900 μM. The detection limits for nitrite was 0.07. The modified electrode has been successfully applied for the assay of nitrite in food samples. The obtained data was check with F and t tests.

A modified ZnO/CNTs nanocomposite ionic liquid carbon paste electrode as a sensor for nitrite determination Keywords:

Nitrite , ZnO/CNTs nanocomposite , Ionic liquids , Voltammetric analysis