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All Journal Program Kreativitas Mahasiswa - Penelitian Jurnal Fisika Unand Jurnal Riset Kimia Jurnal Litbang Industri Indonesian Journal of Chemistry Proceedings of the 1st UR International Conference on Educational Sciences JOPS (Journal Of Pharmacy and Science) Jurnal Hilirisasi IPTEKS (JHI) Eksakta : Berkala Ilmiah Bidang MIPA Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Hydrogen: Jurnal Kependidikan Kimia Jurnal Litbang Industri Journal of Educational Sciences Jurnal Katalisator Jurnal Kimia Unand Journal of Science and Clinical Pharmacy Research
Deswati Deswati
Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Andalas
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Journal : Jurnal Riset Kimia

 1 
STUDI OPTIMASI KROMIUM (VI) DALAM AIR LAUT SECARA VOLTAMMETRI STRIPPING ADSORPTIF -, Deswati; Suryani, Hamzar; -, Imelda; -, Yulia
Jurnal Riset Kimia Vol 3, No 1 (2009): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v3i1.45

Abstract

 ABSTRACT Study of optimation chromium (VI) in sea water by adsorptive stripping voltammetry has been done. The aim of this method to get optimum conditions for determination of Cr(VI). Adsorptive stripping voltammetry (AdSV) has been used for the ultra trace determination of chromium using 2,2’- bipyridin as ligand. Parameters were done, like accumulation time, concentration of ligand, pH, accumulation potential, electrolyte concentration and catalyst concentration. In this case, the optimum conditions were reached in accumulation time 80 second, pH 5.0, concentration of 2,2’- bipyridin 10 μM, accumulation potential -0,6 Volt and electrolyte concentration (NH4Cl) 0,1 M. In the optimum conditions, a linear calibration graph was obtained with correlation coefficient of 0.9971, the relative standard deviation was 15.06 % for eight replicates (n = 8) measurements of 10 μg/L of Cr(VI). The detection limit method was 0.1692 μg/L. The method was applied to the direct determination of Cr(VI) in sea water around Muara Padang water. Concentration Cr(VI) in sample was equal to 0.9684 μg/L with recovery of 90.23 %. Keywords : optimation, chromium, adsorptive, stripping, voltammetry
STUDI OPTIMASI PENENTUAN Cu(II) DENGAN MENGGUNAKAN KALKON SEBAGAI PENGOMPLEK SECARA VOLTAMMETRI STRIPPING ADSORPTIF (AdSV) -, Deswati; Suyani, Hamzar; Arifin, Bustanul; -, Imelda; Salamah, Yunita
Jurnal Riset Kimia Vol 4, No 2 (2011): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v4i2.131

Abstract

 ABSTRACT The research about determination of Cu(II) by adsorptive stripping voltammetry (AdSV) was conducted. AdSV method was applied to the determination of copper in ultra trace concentration. The parameters of ligand, accumulation potential, accumulation time, pH and ligand concentration was studied. Calcon was found as complexing agent that give the highest peak current. The optimum condition are accumulation potential -0,7 V, accumulation time 60 s, pH 10, and calcon concentration 0.12 mM. The relative standar deviation (n=8) at 10 µg/L standard concentration were obtained 4,27 %. This method was applied to determination of Cu(II) in sample from Batang Air Dingin, Lubuk Minturun and Muara Padang. The sample concentration were 4,778 µg/L and 5,189 µg/L for Batang Air Dingin and Muara Padang, respectively. The recovery of this method was studied for sample from Muara Padang and 98,31 % was obtained. Key words :   Adsorptive, Stripping, Voltammetry, Calcon and Copper    
STUDI OPTIMASI PENENTUAN KADMIUM(II) SECARA VOLTAMMETRI STRIPPING ADSORPTIF Deswati, Deswati; Suyani, Hamzar; Buhatika, Citra
Jurnal Riset Kimia Vol 3, No 2 (2010): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v3i2.37

Abstract

  ABSTRACT Study of optimation cadmium(II) by adsorptive stripping voltammetry has been done. The aim of this study to get optimum conditions for determination of Cd(II). Parameters were done : potential accumulation, time accumulation, pH, supporting electrolite concentration and optimum of complex concentration. In this case, the optimum conditions were reached in potential accumulation -0.7 V, time accumulation 60 second, pH 7.0, NH4Cl 0.12 M, calcon concentration 0.12 mM. In the optimum condition was obtained with the relative standard deviation was 4.61% for eight replicates, measurements of 0.01 ppm. The method was applied to the direct determination of Cd(II) in water around Batang Air Dingin Lubuk Minturun and Muara Padang. Concentration Cd(II) in sample was equal to 7.359 μg/L and 3.659 μg/L with recovery of 99.04%. Keywords: cadmiun, adsorptive, stripping, voltammetry
THE OPTIMATION SIMULTANEUOS DETERMINATION OF LEAD(II) AND CADMIUM(II) BY ADSORPTIVE STRIPPING VOLTAMMETRY (ADSV) -, Deswati; Suyani, Hamzar; Loekman, Umiati; Sari, Nilam
Jurnal Riset Kimia Vol 5, No 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.198

Abstract

A selective and sensitive adsorptive stripping voltammetric (AdSV) method for simultaneous determination of lead(II) and cadmium(II) were proposed. The aim of this study was to get the optimum condition for simultaneuos determination of lead(II) and cadmium(II). The parameters were studied such as: variation of accumulation potential, accumulation time, pH, and variation ofcalcon concentration. In this case, the optimum conditions were reached at accumulation potential –0.7 V, accumulation time 80 s, concentration of 0.12 mM calcon, and pH 7.0. At the optimumconditions the relative standard deviation were 2.90% and 1.46% for Pb(II) and Cd(II) respectively for eight replicates (n = 8) measurements. The method was applied for the direct determination of Pb(II) and Cd(II) in sea water around Bungus, Padang City. Concentration Pb(II) and Cd(II) insample were 9.918 μg/L – 27.320 μg/L for Pb(II) and 7.997 μg/L - 32.521 μg/L for Cd(II), with recovery of 99.48%, and 103.28 for Pb(II), and Cd(II) respectively.
STUDI OPTIMASI PENENTUAN KADMIUM(II) SECARA VOLTAMMETRI STRIPPING ADSORPTIF Deswati Deswati; Hamzar Suyani; Citra Buhatika
Jurnal Riset Kimia Vol. 3 No. 2 (2010): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v3i2.37

Abstract

  ABSTRACT Study of optimation cadmium(II) by adsorptive stripping voltammetry has been done. The aim of this study to get optimum conditions for determination of Cd(II). Parameters were done : potential accumulation, time accumulation, pH, supporting electrolite concentration and optimum of complex concentration. In this case, the optimum conditions were reached in potential accumulation -0.7 V, time accumulation 60 second, pH 7.0, NH4Cl 0.12 M, calcon concentration 0.12 mM. In the optimum condition was obtained with the relative standard deviation was 4.61% for eight replicates, measurements of 0.01 ppm. The method was applied to the direct determination of Cd(II) in water around Batang Air Dingin Lubuk Minturun and Muara Padang. Concentration Cd(II) in sample was equal to 7.359 μg/L and 3.659 μg/L with recovery of 99.04%. Keywords: cadmiun, adsorptive, stripping, voltammetry
THE OPTIMATION SIMULTANEUOS DETERMINATION OF LEAD(II) AND CADMIUM(II) BY ADSORPTIVE STRIPPING VOLTAMMETRY (ADSV) Deswati -; Hamzar Suyani; Umiati Loekman; Nilam Sari
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.198

Abstract

A selective and sensitive adsorptive stripping voltammetric (AdSV) method for simultaneous determination of lead(II) and cadmium(II) were proposed. The aim of this study was to get the optimum condition for simultaneuos determination of lead(II) and cadmium(II). The parameters were studied such as: variation of accumulation potential, accumulation time, pH, and variation ofcalcon concentration. In this case, the optimum conditions were reached at accumulation potential –0.7 V, accumulation time 80 s, concentration of 0.12 mM calcon, and pH 7.0. At the optimumconditions the relative standard deviation were 2.90% and 1.46% for Pb(II) and Cd(II) respectively for eight replicates (n = 8) measurements. The method was applied for the direct determination of Pb(II) and Cd(II) in sea water around Bungus, Padang City. Concentration Pb(II) and Cd(II) insample were 9.918 μg/L – 27.320 μg/L for Pb(II) and 7.997 μg/L - 32.521 μg/L for Cd(II), with recovery of 99.48%, and 103.28 for Pb(II), and Cd(II) respectively.
Co-Authors A.A. Ketut Agung Cahyawan W Adewirli Putra Adlis Santoni Agustiva Agustiva Anthoni Agustien Arnentis Arnentis, Arnentis Aura, Selfi Monica Azimatur Rahmi BUSTANUL ARIFIN Bustanul Arifin Bustanul Arifin Buty Kurnia Hamzani Chairul Chairul Chessia Nodifa Putri Citra Buhatika Devahimer Harsep Rosi Efmisa, Ariesta Kirana Efrizal Efrizal Efrizal Efrizal Elma Fadrita Rahman Emriadi - Evi Suryawati Fajarandi, Nabiel Farnandi, Rido Hamdhan Fathony Hamzar Suyani Hilfi Pardi Imelda - Khairil Armal Kiki Fatmala, Kiki L.N. Firdaus, L.N. Firdaus Mai Efdi Mai Efdi Mariani Natalina Matlal Fajri Alif Murdiman, Imelda Nabiel Fajarandi Nadia Nadia Nilam Sari Novesar Jamarun Novesar Jamarun Novsimapera, Gatri Nurmiati Nurmiati Nurmiati Nurmiati Olly Norita Tetra Putri Ramadhani Putri, Anggi Nabila Raesa Pratiwi Putri Rahmiana Zein Rido Farnandi Rosi, Devahimer Harsep Rusnam Rusnam Safni Safni Safni Safni Safni Salmariza Sy Sofyan Sofyan Suci Wulandari Suryani, Hamzar Suryati Suryati Suryati Suryati Suwirmen, Suwirmen Suwondo Suwondo Syukri Arief Syukri Arief Syukri Syukri Syukri Syukri Umiati Loekman Umiati Loekman Umiati Loekman Vanella Indah Pratiwi Yetria Rilda Yulia - Yulizar Yusuf Yulizar Yusuf Yunita Salamah Zakaria, Indra Junadi Zeni, Izza Fildza Zilfa Zilfa Zuhri Syam Zuhri Syam