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All Journal ALCHEMY Jurnal Penelitian Kimia CHEDS: Journal of Chemistry, Education, and Science
Ria Sri Rahayu
Institut Teknologi Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology

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Analisis Logam Cr(III) Hasil Reduksi Cr(VI) dengan Teknik Voltammetri Lucutan Menggunakan Elektroda Pasta Karbon Termodifikasi EDTA: Studi Pendahuluan Annisa Anggitami; Dian Ayu Setyorini; Muhammad Yudhistira Azis; Ria Sri Rahayu
ALCHEMY Jurnal Penelitian Kimia Vol 17, No 2 (2021): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.17.2.47875.185-191

Abstract

Pada penelitian ini dikembangkan suatu metode pengukuran Cr(III) menggunakan elektroda pasta karbon (EPK) yang termodifikasi EDTA yang dapat diaplikasikan dalam penentuan efektivitas reduksi limbah Cr(VI) serta penentuan Cr(VI) dalam suatu sampel secara tidak langsung. Metode analisis voltammetri yang dilakukan menggunakan teknik voltammetri siklik, differential pulse voltammetry dan square wave voltammetry. EDTA merupakan ligan polidentat yang dapat mengkelat beberapa logam. Untuk logam kromium, EDTA hanya bisa mengkelat Cr(III). Oleh karena itu, dalam proses pengukurannya dilakukan reduksi Cr(VI) menjadi Cr(III) yang kemudian dapat dianalisis menggunakan EPK yang termodifikasi EDTA. Teknik voltammetri dipilih karena memiliki sensitivitas yang tinggi, limit deteksi yang rendah, dan memiliki daerah linier yang lebar. Hasil penelitian memperoleh bahwa Cr(III) dapat dianalisis dengan EPK termodifikasi EDTA menggunakan teknik voltammetri lucutan. Kondisi optimum pengukuran yang diperoleh adalah menggunakan elektroda dengan komposisi grafit: EDTA 25% berat (w/w), larutan elektrolit NaCl 0,1 M, waktu deposisi 5 detik, dan potensial deposisi 300 mV. Carbon Paste Electrode Modified by EDTA for Determination of Cr(III) Reduced from Cr(VI) by Using Stripping Voltammetry Method: A Preliminary Study. This study presented a method of measuring Cr(III) using carbon paste electrodes (CPE) modified by EDTA, which could be applied in determining Cr(VI) waste indirectly. EDTA is a polydentate ligand that can chelate several metals. For chromium metal, EDTA can only chelate Cr(III). Therefore, a reduction of Cr(VI) to Cr(III) was carried out in the measurement process and then analyzed using an EDTA-modified carbon paste electrode. The technique was chosen because it has a high sensitivity, low detection limit, and has a wide linear area. The results showed that Cr(III) could be analyzed using EDTA-modified CPE using stripping voltammetry. The optimum measurement conditions obtained were using an electrode with a composition of 25% weight (w/w) EDTA, 0.1 M NaCl as supporting electrolyte, 5 seconds for deposition time, and 300 mV for deposition potential.
ELEKTRODA PASTA KARBON YANG DIMODIFIKASI OLEH AMPAS TEBU TERAKTIVASI UNTUK ANALISIS ION CR(VI) SECARA VOLTAMMETRI Annisa Anggitami; Ria Sri Rahayu; Muhammad Yudhistira Azis
CHEDS: Journal of Chemistry, Education, and Science Vol 7, No 1 (2023)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v7i1.7349

Abstract

Heavy metal pollution, particularly chromium (Cr) contamination, poses a significant threat to the environment due to improper waste processing in industries such as electroplating. This study focuses on the development of a sensitive analysis method using voltammetry to detect low concentrations of toxic Cr(VI) ions in environmental samples. The use of activated bagasse as an efficient, cost-effective, and environmentally friendly sensor is explored. The surface area of the carbon paste electrode is increased by modifying it with activated bagasse, which enhances the measurement sensitivity. Optimization of the measurement techniques and sample analysis is carried out, including the activation of bagasse and the composition of the activated graphite:bagasse (BG) electrode. The optimal condition for measurement is achieved with a 5% (w/w) composition of activated graphite:BG electrode. The modified electrode exhibits good repeatability, with a linear range of 1-1000 μM and a detection limit of 0.5373 μM. The %RSD values obtained using Differential Pulse Voltammetry (DPV) and Square Wave Voltammetry (SWV) are 4.794% and 3.593%, respectively. Analysis of the scan rate suggests that the electron transfer process is controlled by adsorption. The activated electrode is successfully applied to analyze artificial samples, and the results are comparable to those obtained using the Atomic Absorption Spectroscopy (AAS) method. 
Co-Authors Annisa Anggitami Annisa Anggitami Dian Ayu Setyorini Muhammad Yudhistira Azis, Muhammad Yudhistira