Modification of Screen Printed Carbon Electrode (SPCE) with Fe3O4 for the Determination of Nitrite (NO2-) in Squarewave Voltammetry

Erica Marista Rosida,Rachmat Triandi Tjahjanto,Ani Mulyasuryani

doi:10.20884/1.jm.2017.12.2.342

Erica Marista Rosida, Rachmat Triandi Tjahjanto + Show 1 more

Open Access

https://doi.org/10.20884/1.jm.2017.12.2.342

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Journal: Molekul	Publication Date: Nov 30, 2017
Citations: 3	License type: CC BY 4.0

Affiliation: University of Brawijaya

Abstract

Nitrite is one of the food preservatives that the government permits, but on the use of over limits can cause endanger health, so it is necessary to control the content of nitrite in the food. Modification of electrodes on a screen printed carbon electrode (SPCE) with Fe3O4 has been successfully done for determination of nitrite. Modification of the electrode has been done by electrodeposition with cyclic voltammetry. Electrodeposition successfully performed with an electrolyte solution of FeCl3 in ethanol. Selection of the optimum drying temperature modified electrode obtained based on the respond of the solution of nitrite in Britton Robinson buffer pH 8. The result of the modification electrode used for the determination of nitrite with squarewave voltammetry method. Reaction between Fe3+ with nitrite a basis for determining nitric indirectly measured so that the peak current is the peak current of Fe3+ of about 0,55 V vs Ag/AgCl. The results showed nitrite measurements with this method has a detection limit of 1.3 x 10-8 M.

Highlights

Nitrite is one of the food preservatives that the government permits, but on the use of over limits can cause endanger health
In 2014 the working electrode modified with Fe2O3/GO, Pt as a supporting electrode and Ag/AgCl as the reference electrode was used for the determination of nitrite in phosphate buffer with differential pulse voltammetry method (Radhakrishnan, Krishnamoorthy, Sekar, Wilson, & Kim, 2014)
In 2015, the working electrode modified with poly-Fe3O4 that is immobilized on multiwalled carbon nantubes (MWCNT) (Qu, Dong, Wang, & Xing, 2015)

Summary

INTRODUCTION

Nitrite is one of the food preservatives that the government permits, but on the use of over limits can cause endanger health. Determination of nitrite in the voltammetry method has been studied in a variety of modifications to the working electrode. In 2014 the working electrode modified with Fe2O3/GO, Pt as a supporting electrode and Ag/AgCl as the reference electrode was used for the determination of nitrite in phosphate buffer with differential pulse voltammetry method (Radhakrishnan, Krishnamoorthy, Sekar, Wilson, & Kim, 2014). In 2015, the working electrode modified with poly (diallyldimethylammonium)-Fe3O4 that is immobilized on multiwalled carbon nantubes (MWCNT) (Qu, Dong, Wang, & Xing, 2015) The result of these modifications was used for the determination of nitrites in cyclic voltammetry. A modification of electrode carried on the screen printed carbon electrode (SPCE) with Fe3O4 for the determination of nitrite. Response mechanism that occurs on the electrode surface modification of Fe3O4 is nitrite oxidized to nitrate by Fe3+ and Fe3+ itself is reduced to FeFe2+2+. Instruments The intruments used analytical balance (Mettler Toledo AL204), pH meter (Trans Instrumens Senz pH), magnetic stirrer and stirrer (IKAMAG®RH), oven (Memmert), micro pipette (Accumax pro), screen printed carbon electrode (SPCE) BI 1302 (Quasense Inc.), potentiostat / Galvanostat Uniscan PG581, FEI Inspect S50 SEM and EDAX AMETEK

Procedures Modification of SPCE

RESULTS AND DISCUSSION

CONCLUSION