Deteksi Ion Nitrit Secara Elektrokimia Menggunakan Elektroda Emas Termodifikasi Nanopartikel Fe3O4 Dan Nafion

Putra, Ruzain Rafie Sukma (2026) Deteksi Ion Nitrit Secara Elektrokimia Menggunakan Elektroda Emas Termodifikasi Nanopartikel Fe3O4 Dan Nafion. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ion nitrit (NO₂⁻) telah menjadi perhatian karena dampaknya terhadap lingkungan dan kesehatan. Oleh karena itu, perlu dilakukan pemantauan kadar ion nitrit. Pada penelitian ini, elektroda emas termodifikasi dengan pasta nanopartikel Fe3O4 dan Nafion (Fe3O4/Nafion) difabrikasi untuk mendeteksi kadar ion nitrit dalam air. Hasil sintesis nanopartikel melalui metode elektrolisis telah dikonfirmasi dengan X-Ray Diffraction (XRD) sebagai Fe3O4. Hasil analisis Field Emission Scanning Electron Microscope (FE-SEM) menunjukkan ukuran partikel sebesar 51,4 nm. Evaluasi elektroda termodifikasi untuk deteksi ion nitrit melalui teknik siklik voltametri (CV) menunjukkan peningkatan puncak arus pada pH 7. Analisis luas permukaan aktif menunjukkan bahwa modifikasi dengan Fe3O4/Nafion dapat meningkatkan luas permukaan elektroda secara signifikan. Hasil CV menunjukkan respons oksidasi nitrit pada elektroda termodifikasi seiring dengan peningkatan kadar ion nitrit. Analisis sensitivitas elektroda dilakukan dengan metode amperometri, menghasilkan nilai limit deteksi (LOD), limit kuantitasi (LOQ), dan sensitivitas elektroda sebesar 0,0003 mg/L; 0,001 mg/L; dan 3,065 μA (mg/ L)⁻¹ cm-2 . Analisis interferensi dengan keberadaan NO₃⁻, SO₄²⁻, NH₄⁺, Cl⁻, Zn²⁺, Pb²⁺, Ca²⁺, K⁺, PO₄³⁻, Fe²⁺, dan urea tidak menunjukkan gangguan pada sinyal. Analisis repeatability dan reproducibility menghasilkan nilai persentase standar deviasi relatif (%RSD) yang cukup rendah. Elektroda termodifikasi telah terbukti dapat memberikan hasil yang sama seperti metode spektrofotometri.
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Nitrite ions (NO₂⁻) have been a concern for both environmental and health issues. It is crucial to monitor the nitrite ion level. In this work, gold modified with Fe3O4 nanoparticles and Nafion paste (Fe3O4/Nafion) have been fabricated to monitor nitrite ion levels in water. The synthesized nanoparticles were prepared via electrolysis methods and were confirmed as Fe3O4 by X-ray diffraction (XRD), while the Field Emission Scanning Electron Microscope (FE-SEM) analysis revealed an average particle size of 51,4 nm. The electrochemical performance of the modified electrode towards nitrite detection was evaluated using cyclic voltammetry (CV). The result demonstrated an enhanced oxidation peak current towards nitrite under the optimum condition of pH 7. Electrochemically active surface are analysis indicated that Fe3O4/Nafion modification can significantly increase the active surface area of the electrode. The sensitivity of the modified electrode was evaluated via amperometric methods, resulting in a limit of detection (LOD) and limt of quantification (LOQ) of 0,0003 mg/L and 0,001 mg/L with a sensitivity of 3,065 μA (mg/ L)⁻¹ cm-2 . The interference studies demonstrated that the presence of NO₃⁻, SO₄²⁻, NH₄⁺, Cl⁻, Zn²⁺, Pb²⁺, Ca²⁺, K⁺, PO₄³⁻, Fe²⁺, and urea did not alter the current produced by nitrite ion. The repeatability and reproducibility analysis showed a low relative standard deviation (%RSD). The modified electrode was evaluated to monitor nitrite ion in a water sample, giving the same result as produced by spectrophotometry methods, demonstrating an alternative method to detect nitrite ion.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Elektroda emas, Elektrokimia, Ion nitrit, Nafion, Nanopartikel Fe3O4, Electrochemistry, Fe3O4 Nanoparticles, Gold Electrode, Nafion, Nitrite Ion
Subjects:	Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis Q Science > QD Chemistry > QD75.2 Chemistry, Analytic
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Ruzain Rafie Sukma Putra
Date Deposited:	05 Aug 2026 01:44
Last Modified:	05 Aug 2026 01:44
URI:	http://repository.its.ac.id/id/eprint/143832

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