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All Journal VALENSI International Journal of Renewable Energy Development Jurnal Riset Kimia Jurnal Keramik dan Gelas Indonesia Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry PENDIPA Journal of Science Education Molekul: Jurnal Ilmiah Kimia Jurnal Keramik dan Gelas Indonesia Journal of Advanced Technology and Multidiscipline (JATM)
Yeni Wahyuni Hartati
Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Padjadjaran
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics

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Journal : Al-Kimia

 1 
Penentuan Unsur Tanah Jarang Kelompok Sedang secara Voltammetri Pindai Linier Menggunakan Elektrode Grafit Pensil Yeni Wahyuni Hartati; Elsa Nur Utami; Diana Hendrati; Titin Sofyatin
Al-Kimia Vol 4 No 1 (2016): June
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (461.409 KB) | DOI: 10.24252/al-kimia.v4i1.1452

Abstract

Rare earth elements play an important role in a variety of applications, mostly for high-tech industries. But their presence in mineral jointly separation makes it difficult to determine the content of rare earths because each element has physical and chemical properties are almost identical. The purpose of this study is the use of a linear scan voltammetry method to study the electrochemical characteristics of the medium rare earth element group (Sm, Gd, Eu, Tb), as an alternative method of separation and analysis of rare earth elements. The electrode used is a graphite pencil electrodes without modification, with a variety of supporting electrolyte. The results obtained show some supporting electrolyte provides good reduction peak for gadolinium, compared to the peaks of the reduction potential of the single rare earth ions other. The potential range of the most well using pencil graphite electrode obtained at 0.50 V to -1.00 V. Analysis of single gadolinium provide linear regression equation in a concentration range of 4.0 to 10.0 mg/L by the equation Y = 0.9862 X + 0.828 with R2 = 0.9954. The limit of detection is determined from the linear regression obtained 0.72 mg / L.
Modifikasi Elektrode Glassy Carbon Dengan Nanopartikel Emas Dan Aplikasinya Untuk Mendeteksi Kromium(VI) Secara Voltammetri Pulsa Differensial Santhy Wyantuti; Mahendra Permadi; Diana Hendrati; Yeni Wahyuni Hartati
Al-Kimia Vol 5 No 1 (2017): June
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v5i1.2844

Abstract

Chromium(VI) is very toxic and has been classified as a carcinogen in humans breathing. Purpose of this experiment is to analyze chromium(VI ) in voltammetry using a glassy carbon electrode modified with gold nanoparticles. Voltammetry method is a method of measuring the current generated from a given potential to the working electrode so that the electrode can be widely modified work. The procedures were produce pencil graphite electrode that was coated by gold nanoparticles and measured chromium(VI) signal. From this study obtained a detection limit of 12.70 ppm and 99.99% precision measurement and measurement of 0.8 V deposition potential, deposition time  of 120 seconds and a scan rate of 0.01 V/s optimum.
Co-Authors Aga Adi Masyhuri Annisa Ilma Naviardianti Annisa Ilma Naviardianti Ari Hardianto Atiek Rostika Noviyanti Azhari Yusuf Azizah, Mamlikatu Ilmi Budi Adiperdana Diana Hendrati Diana Hendrati Diana Rakhmawaty Eddy Diana Rakhmawaty Eddy Diding Mandala Putra Eddy, Diana Rakhmawaty Egista Istioka Fazrin Ekawardani, Savira Elin Marlin Elsa Nur Utami Fadhilah, Riana Adisti Firdaus, Muhammad Lutfi Hesti Lina Wiraswati Husein Hernadi Bahti IMAN PERMANA MAKSUM Iman Permana Maksum Irkham, Irkham Khaerani, Wulan Lia Faridah Lubis, Rubianto A. M. Lutfi Firdaus M. Lutfi Firdaus Mahendra Permadi Masyhuri, Aga Adi Muhammad Hilman Daniswara Muhammad Yusuf Mulyani, Rahmaniar Nida Yumna Nurmalasari, Ratna Nurul Auliany Pratomo, Uji PUTRI, RAFIKA Putri, Rafika Nanda Rahmaniar Mulyani Ravenna Aristantia Riana Adisti Fadhilah Rini Surbakti Rizki Muharami Cedia Sari Rubianto A. Lubis Rukiah Rukiah Rustaman Rustaman Safri Ishmayana Salma Nur Zakiyyah Santhy Wyantuti Sari Syahruni Savira Ekawardhani Shabarni Gaffar Shabarni Gaffar Shabarni Gaffar Shabarni Gaffar Shabarni Gaffar Shabarni Gaffar Shabarni Gaffar Shabarni Gaffar -, Shabarni Gaffar Shabrinna, Hanif Shauvina, Shauvina A Solihudin Solihudin Supriyadi, Isma Yustifania Titin Sofyatin Toto Subroto Yohan Yohan Yohan Yohan Zakiyyah, Salma Nur Zalfadilah, Faizal Nur Zein, Muhammad Ihda Hamlu Liwaissunati