73 / 2016-05-01 01:18:44

Electrocatalytic Reduction of Nitrite in the Aqueous Solutions Using Nano Zeolite Modified Carbon Paste Electrode

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Nitrite ion is a critical precursor in the formation of nitrosamines, many of which have been shown to be carcinogens and harmful on our environment. Nitrites are used as food preservatives against food poisoning microorganisms such as clostridium botulinum [1] and their salts are known to occur in high quantity in soil. For these reasons, determination of nitrite has received substantial attention. Various methods have been developed to determination nitrite, which are laborious to perform or require chemical reagents [2], but the electrochemical approaches are favorable owing to the rapid response and simple operation. The direction electroreduction of nitrite ion on the most electrode surfaces take place at extremely negative potential and it is difficult to detect nitrite directly using its reduction behavior. Then, chemically modified electrodes have been studied for the determination of nitrite. Zeolite-supported electrocatalysts can be subjected to improve the performance of the electrocatalytic responses with reduced overpotentials and increased voltammetric signals allowing low detection limits and high sensitivities [3,4]. In this research synthesized nano ZSM-5 modified carbon paste electrode (NZMCPE)was used for electrocatalytic determination of nitrite by voltametric technique.

Appropriate amount of Nano ZSM-5 zeolite dopped with Ni 2+ ions and graphite powder and some drop of paraffin were mixed. The resulting paste was inserted in the bottom of a glass tube. The electrical connection was implemented by a copper wire lead fitted into the glass tube. The effective parameters such as pH, nitrite concenteration and scan rate of potential were investigated.

Obtained results shown that the NZCPE can be used for nitrite determination in aqueous synthetic and real solution. The LOD and LDR for determination of nitrite using cyclic voltametry techniques were obtained 5.3*10-5 M and 6*10-5 – 1*10-3 M respectively.
[1] Yetim, H.; Kayacier, A.; Kesmen, Z.; Sagdic, O. Meat Sci. 2006, 72, 206.
[2] Zhang, M.; Yuan, D. X.; Chen, G. H.; Li, Q.L.; Zhang, Z.; Liang, Y. Microchim. Acta. 2008, 160, 461.
[3] Ojani, R ; Raoof, J. B.; Zarei, E.; Azizi, S. N.; Abrishamkar, M. Monatshefte für Chemie .2012 , 143, 7.
[4] Abrishamkar, M.; Azizi, S. N.; Raoof, J. B. Monatshefte für Chemie. 2012, 143, 409.