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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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Analisis Logam Fe dengan Teknik Voltammetri Pelucutan Anodik Pulsa Diferensial dalam Tanaman Pakcoy dari Perkebunan Sayur Bedugul Bali Irdhawati Irdhawati; Rosanti Suryani Tince Mbatu; Emmy Sahara
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (982.25 KB) | DOI: 10.15408/jkv.v4i2.7588

Abstract

Pakcoy is one of the most popular vegetable. The use of synthetic fertilizers and pesticides contain heavy metals can contaminate pakcoy vegetable. This research aims to determine the validity of measurements and concentration of Fe in pakcoy using differential pulse anodic stripping voltammetry technique.The working, reference, and counter electrodes were platinum disk, Ag/AgCl, and Pt wire, respectively. The optimum measurement results of the standard solutions of Fe(III) obtained the optimum deposition time was 70 seconds, the optimum scan rate was 10 mV/s, and the optimum deposition potential at -0.47 V. A linear concentration of standard solution of Fe(III) observed at the range of 50 ppb~500 ppb, with correlation coefficient 0.9954. Limit of detection was 50.18 ppb. The repetition of 10 times measurements had a Horwitz ratio of less than 2. Percent recovery was 100.26% ± 0.27%. The average of Fe(III) concentration in the samples from 5 (five) locations of the pakcoy sampling contains 3.82±0.29 ppm, less than SNI treshold line of 5.0 ppm.  
Differential Pulse Voltammetry Technique Using Ferrocene-Modified Carbon Paste Electrodes for Determination of Pb(II) In Kepok Banana Irdhawati Irdhawati; Feby Silvia; Emmy Sahara; Nur Alisyah Gani
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 2, November 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i2.16610

Abstract

The voltammetry method is a field of electrochemistry that measures electric current at a certain potential, which can be used to determine the concentration of inorganic and organic compounds that can be oxidized or reduced. In this research, the differential pulse voltammetry (DPV) technique has been used to determine the content of Pb(II). The carbon paste electrode (CPE) and ferrocene-modified carbon paste electrode (CPE-Fc) were used as working electrodes. This study aims to improve the sensitivity of Pb(II) measurement. Two parameters were optimized were ferrocene composition and scan rate. The validation parameters involved the linear concentration range, detection limit, quantization limit, precision and accuracy. The optimum ferrocene composition was found at 6%, and scan rate was 15 mV/s using CPE, increase to 20 mV/s using CPE-Fc. The validation results showed  the linearity using CPE-Fc  wider than CPE at the peak potential of 0.515 V. The detection and quantization limit values using CPE were 0.1551 µg/L and 0.1556 µg/L, and down to 0.1089 µg/L and 0.1090 µg/L using CPE-Fc. The precision determination for both of CPE and CPE-Fc had good results, indicated by the Horwitz ratio less than two. Percentage of recovery using CPE-Fc of 85.59  8.18%. CPE-Fc at the optimum measurement conditions was used to determine the levels of Pb(II) in kepok banana, and the result was obtained 4.4306  0.0009 mg/kg. The level of Pb content was found to exceed the established threshold based on Standard National Indonesia (ISN) No. 7387:2009  which is 0.5 mg/kg.
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