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All Journal VALENSI CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) INDONESIAN JOURNAL OF LEGAL AND FORENSIC SCIENCES Jurnal Kimia (Journal of Chemistry) Jurnal Riset Kimia Jurnal Kimia Riset Chemistry Indonesian Journal of Chemical Research Aceh International Journal of Science and Technology
Emmy Sahara
Program Studi Kimia FMIPA Universitas Udayana, Bukit Jimbaran, Bali
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology

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Journal : Aceh International Journal of Science and Technology

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Activated Bentonite Modified-Carbon Paste Electrode for Determination The Level of Copper Ion (Cu2+) in Tomato Irdhawati Irdhawati; Ekki Inur Ingtyas Mawarni; Ayu Jyostosya Yotirani Arya Wijana; Feby Silvia Sitio; Ni Putu Gita Widi Saraswati; Emmy Sahara
Aceh International Journal of Science and Technology Vol 9, No 3 (2020): December 2020
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (540.077 KB) | DOI: 10.13170/aijst.9.3.17856

Abstract

Voltammetry is an electroanalytical method measure current as a function of applied potential. The working electrode in the voltammetry method dramatically affects the result of the electrochemical analysis. Modification of the working electrode can improve measurement performance. In this research, the carbon paste electrode (CPE) was modified with Bentonite (CPEB) to determine copper's level using differential pulse voltammetry technique. CPE and CPEB were used as working electrodes, handmade Ag/AgCl as a reference electrode, and Pt wire as the counter electrode. The measurement parameters were optimized, including the composition of bentonite in carbon paste and scan rates. Furthermore, the measurement conditions were validated, involved linear concentration range, detection limit (LoD), the limit of quantization (LoQ), repeatability, and recovery. The results showed that bentonite's optimum composition was 40% of the total weight of graphite and activated bentonite.  The scan rate optimum for Cu2+ measurement was obtained at 20 mV/s with CPE and became faster to be 25 mV/s with CPEB. The linearity of the standard solution measurement of Cu2+ using CPE was in the range of 5 to 100 μg/L and changed to 5 to 500 μg/L using CPEB. LoD and LoQ values of standard solution Cu2+ measurement with CPEB were slower than CPE. The Horwitz ratio calculation was smaller than two for both CPE and CPEB. The recovery of Cu2+ standard measure in sample solution as the matrix was obtained 93,49 ± 6,39%. According to the Decree of the Ministry of Health Number, the level of Cu2+ in the tomato sample was found 6.019 ± 0.69 mg/kg, which is over than threshold value of Cu2+ (5 mg/kg) 03725/B/SK/VII/89. 
Co-Authors A. A. I. A. M. Laksimawti Anak Agung Istri Agung Mayun Laksmiwati Arik Agustina Ayu Jyostosya Yotirani Arya Wijana D. E. Permatasaari Ekki Inur Ingtyas Mawarni Feby Silvia Feby Silvia Sitio Gde Agus Surya Cahyadi Gusti Agung Putu Merta Dharmayoga I Gede Darma Putra I Gusti Agung Gede Bawa I Gusti Ayu Kunti Sri Panca Dewi I Gusti Ngurah Raka Aryawan I K. Y. Resyana I Made Agus Gelgel Wirasuta I Made Siaka I Made Sutha Negara I Putu Adi Surya Mahardika I Wayan Hermawan I Wayan Suarsa I Wayan Sudiarta I. A. Gede Widihati Ida Bagus Putra Manuaba Irdhawati Irdhawati Iryanti Eka Suprihatin James Sibarani Kristina Indra Yanthy T Kusuma Hidayatullah Manuntun Manurung Ni Kadak Nevi Titasia Ni Kadek Dahliani Ni Luh Eka Lusiana Dewi Ni Nyoman Triyunita Sinthadevi Ni Putu Diana Febriyanti Ni Putu Gita Widi Saraswati Ni Putu Widyana Kartini Nur Alisyah Gani Oka Ratnayani P. S. Sihombing Putu Sri Gayatri Putu Suarya Roedy Aris Tavip Rosanti Suryani Tince Mbatu Titasia, Ni Kadak Nevi Vivi Eka Indrayani Wahyu Dwijani Sulihingtyas Wahyu Irwansyah Yulius Leo Adeputra