Fabrikasi Elektroda Besi Termodifikasi Tembaga Untuk Penentuan Ion Oksalat

Mulyawati, Mulyawati (2025) Fabrikasi Elektroda Besi Termodifikasi Tembaga Untuk Penentuan Ion Oksalat. Masters thesis, Institut Teknologi Sepuluh Nopember.

Text 6004231004_Master_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 April 2027. Download (2MB) | Request a copy

Abstract

Penelitian ini mengembangkan elektroda besi (Fe) yang dimodifikasi dengan tembaga (Cu) menggunakan metode pencelupan ke dalam larutan CuSO4 dengan variasi konsentrasi 0,1; 0,3; 0,5; 0,7; dan 1 M, serta variasi waktu pencelupan selama 1, 3, 5, 10, dan 15 menit. Kinerja optimal diperoleh pada pencelupan dalam CuSO4 0,5 M selama 10 menit. Karakterisasi material elektroda dilakukan dengan FE-SEM/EDX dan XRD. Kinerja elektroda dievaluasi menggunakan voltammetri siklik, differensial pulsa voltammetri, dan amperometri. Pengujian pengaruh pH pada variasi 1, 3, 4, 5, 7, dan 9 menunjukkan bahwa pH 9 menjadi kondisi optimal untuk analisis oksalat menggunakan amperometri karena elektroda lebih stabil. Berdasarkan uji pengaruh laju pindai, proses oksidasi asam oksalat pada elektroda Fe termodifikasi Cu dikendalikan oleh difusi, melibatkan satu elekton, dan bersifat irreversible dengan α = 0,9768 dan n = 1,044. Batas deteksi elektroda diperoleh melalui pengujian amperometri sebesar 1,95 µM. Elektroda ini memiliki selektivitas tinggi terhadap ion oksalat di tengah larutan yang mengandung asam urat, glukosa, asam askorbat, dan urea. Uji ripitabilitas dengan satu elektroda untuk 20 kali pengukuran menghasilkan nilai RSD 2,17%. Uji reprodusibilitas dengan lima elektroda berbeda menghasilkan RSD 2,25%. Uji stabilitas menunjukkan penurunan arus sebesar 7,22% setelah satu bulan penyimpanan (dari 1588,42 µA pada minggu pertama menjadi 1473,74 µA pada minggu keempat), tetap dalam batas toleransi untuk aplikasi praktis. Secara keseluruhan, elektroda Fe termodifikasi Cu yang dikembangkan ini menunjukkan potensi besar sebagai sensor elektrokimia untuk analisis ion oksalat dalam larutan dengan keunggulan pada sensitivitas, selektivitas, dan stabilitas yang memadai untuk aplikasi di bidang analisis kimia dan biomedis.
==============================================================================================================================
This study developed a copper-modified iron (Fe) electrode using an immersion method in CuSO₄ solutions with varying concentrations of 0.1, 0.3, 0.5, 0.7, and 1 M, and immersion durations of 1, 3, 5, 10, and 15 minutes. The optimal performance was achieved with an immersion in 0.5 M CuSO₄ for 10 minutes. The material characterization of the electrode was conducted using FE-SEM/EDX and XRD techniques. Electrochemical performance was evaluated using cyclic voltammetry, differential pulse voltammetry, and amperometry. The pH optimization study was performed at pH levels of 1, 3, 4, 5, 7, and 9, with pH 9 identified as the optimal condition for oxalate analysis using amperometry due to the enhanced stability of the electrode. From the scan rate study, the oxidation process of oxalic acid on the copper modified iron electrode was determined to be diffusion-controlled, involving a single electron, and exhibiting irreversible behavior with an α value of 0.9768 and n value of 1.044. The detection limit of the electrode was determined to be 1.95 µM based on amperometric measurements. The electrode demonstrated excellent selectivity for oxalate ions in solutions containing potential interferents such as uric acid, glucose, ascorbic acid, and urea. Reproducibility tests using five different electrodes yielded a relative standard deviation (RSD) of 2.25%, while repeatability tests with a single electrode across 20 measurements resulted in an RSD of 2.17%. Stability tests indicated a current decrease of 7.22% after one month of storage, from 1588.42 µA in the first week to 1473.74 µA in the fourth week, which remained within acceptable limits for practical applications. In conclusion, the developed Cu-modified Fe electrode exhibits excellent sensitivity, selectivity, and stability, making it a promising electrochemical sensor for oxalate ion analysis in solutions, with potential applications in chemical and biomedical fields.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Iron, oxatale, electrochemical sensor, copper, besi, oksalat, sensor elektrokimia, tembaga
Subjects:	Q Science > QD Chemistry > QD75.2 Chemistry, Analytic
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Mulyawati Mulyawati
Date Deposited:	01 Feb 2025 12:42
Last Modified:	01 Feb 2025 12:42
URI:	http://repository.its.ac.id/id/eprint/117423

Actions (login required)

View Item