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All Journal Program Kreativitas Mahasiswa - Penelitian Jurnal Riset Kimia Jurnal Litbang Industri Indonesian Journal of Chemistry Proceedings of the 1st UR International Conference on Educational Sciences Jurnal Hilirisasi IPTEKS (JHI) Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Litbang Industri Jurnal Katalisator
Deswati Deswati
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Andalas University, Kampus Unand Limau Manis Padang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Dentistry Education Engineering Health Professions Industrial & Manufacturing Engineering Medicine & Pharmacology Public Health Social Sciences Veterinary Other

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STUDI OPTIMASI ANALISIS LOGAM CO DAN NI SECARA VOLTAMMETRI STRIPING ADSORPTIF (ADSV) UNTUK PENENTUAN LOGAM DALAM KONSENTRASI RUNUT Putri, Raesa Pratiwi; Agustiva, Agustiva; Pratiwi, Vanella Indah; Deswati, Deswati
Program Kreativitas Mahasiswa - Penelitian PKM-P 2013
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (504.57 KB)

Abstract

The research of the determination of Co(II) and Ni(II) by adsorptive stripping voltammetry have been done. The method used to determine the concentration of cobalt and nickel in trace (ultra trace) with calcon for Co (II) and DMG for Ni (II) as a complexing agent. The parameters  studied were variation of calcon or DMG concentration, pH, accumulation potential and accumulation time. In this study, the optimum conditions were calcon concentration of 0.7 mM for Co (II), DMG concentration of 0.8 mM for Ni (II), pH 6 for Co (II) while pH 9 for Ni (II), accumulation potential -0.3 V and accumulation time of 70 s for the Co (II) and 220 s for the Ni (II). At optimum conditions the relative standard deviation were 0.75% and 1.54%  for Co (II) and Ni (II) respectively for  ten replicates (n= 10) measurement of 10 µg /L standard solution Co(II) and Ni (II).  The method was applied to the direct   determination of Co(II) and Ni(II) in  the Stones River water rot, tap water and sea water Bungus Padang, with recovery of 106.5% and 102%. for Co(II) and Ni(II) respectively.  Keywords: voltammetry, Stripping, adsorptive, trace concentrations.
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
Performance Analysis of Junior High School Natural Sciences Teacher Forum on Professional Development Suryawati, Evi; Fatmala, Kiki; Arnentis, Arnentis; Deswati, Deswati
Proceedings of the 1st UR International Conference on Educational Sciences Vol 1, No 1 (2017)
Publisher : Proceedings of the 1st UR International Conference on Educational Sciences

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Abstract

The aim of this study was to describe the performance of Junior High School Natural Sciences Teacher Forum (MGMP members) in Pekanbaru on professional development. This study was performed on November 2016 to April 2017. Fifty members of Junior High School natural sciences teacher forumin Pekanbaru that has been actively participating in teacher forumactivity took part in this study. The data collection instruments used in this study are closed questionnaire and open questionnaire.Closed questionnaire consists of 30 statements that are divided into 4 indicators namely motivation, creativity, self efficacy, and attitude.Open questionnaire consists of 5 questions. Questionnaires have passed the validity test stage through pearson correlation test. Reliability test results obtained Cronbach alpha value of 0.89 (good). Descriptive data analysis show that performance of Junior High School Natural Sciences teacher forummembers in Pekanbaru on professional development gained a mean of 4.07 (good)with details of average motivation 4,02 (good), average creativity 3,90 (good), average self effficacy 4,09 (good) and average attitude 4,29 (very good). Based on this study we can conclude that Junior High School Natural Sciences teacher forum members in Pekanbaru had a good performance on professional development.
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.
DISEMINASI TEKNOLOGI FORMULATED DIET ALTERNATIF DALAM UPAYA MENINGKATKAN PRODUKTIVITAS BUDIDAYA IKAN NILA INTENSIF Efrizal, Efrizal; Nurmiati, Nurmiati; Agustien, Anthoni; Syam, Zuhri; Suwirmen, Suwirmen; Zakaria, Indra Junadi; Rusnam, Rusnam; Deswati, Deswati
Jurnal Hilirisasi IPTEKS Vol 4 No 4 (2021)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v4i4.580

Abstract

Fish cultivators generally experience difficulties providing quality artificial feed (pellets) due to a lack of knowledge and skills in processing technology and making alternative feeds. Besides that, the costs incurred for feed procurement are relatively large, reaching 70 - 80% of the total production costs. However, the provision of feed is often an obstacle because, in addition to the increasingly high price, the quality of available feed does not always match the nutritional needs needed by Fish. The provision of quality feed for intensively cultivated tilapia dramatically affects the resulting growth and productivity. The higher the quality of the feed, the production will also increase. One of the technologies that can be applied to overcome this problem is the manufacture of alternative formulated diets using local raw materials. The method used in this service activity is the transfer of knowledge presented in the socialization activities in the form of 1) introduction to the types of alternative fish feed ingredients sourced from the area, (2) preparation of artificial tilapia feed formulations, (3) manufacturing technology artificial feed (pellets) and 4) monitoring and assistance. The socialization was carried out in the form of a lecture and was followed by a question and answer session. The results of farmer activities recognize the types of local feed that can be used as fish feed, know the preparation of feed formulations, and alternative artificial feed manufacturing technologies. The knowledge and skills possessed by fish cultivators are expected to overcome the difficulties of fish farmers in providing feed so that fish production and cultivation business increase.
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.
Perlakuan ozon dan sonokimia untuk degradasi residu mankozeb pada cabe hijau (Capsicum annuum L.) Safni Safni; Elma Fadrita Rahman; Deswati Deswati; Salmariza Sy
Jurnal Litbang Industri Vol 11, No 2 (2021)
Publisher : Institution for Industrial Research and Standardization of Industry - Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24960/jli.v11i2.7259.103-109

Abstract

Fungisida, seperti mankozeb, banyak digunakan dalam bidang pertanian berkelanjutan dan akan meninggalkan residu pada bahan pangan. Proses oksidasi lanjutan (AOPs) ozon treatment (ozonolisis dan air ozon), sonokimia (sonolisis) serta kombinasi keduanya (sonozolisis) merupakan salah satu teknik potensial dalam mendegradasi residu mankozeb pada cabe hijau. Perbandingan metode degradasi dilakukan pada kondisi yang sama yakni 50 g cabe hijau, 100 mL air dengan waktu treatment 10 menit mampu mendegradasi residu mankozeb sebesar 69,63±1,60 air ozon; 58,83±2,57 sonozolisis; 56,51±2,29 ozonolisis; dan 23,70±1,60 sonolisis. Penambahan waktu perendaman selama 20 menit air ozon meningkatkan persentase degradasi sebesar 83,80±2,54. Beberapa parameter yang mempengaruhi proses degradasi dipelajari seperti waktu treatment, volume air, dan massa cabe hijau. Proses degradasi dengan waktu treatment 10-15 menit, volume air 100 mL dan 50 g cabe hijau mampu mereduksi residu mankozeb sebesar 25-58%. Data hasil analisis spektrofotometer-HPLC menunjukkan bahwa residu mankozeb pada cabe hijau telah berhasil didegradasi.
Co-Authors A.A. Ketut Agung Cahyawan W Agustiva Agustiva Anthoni Agustien Arnentis Arnentis, Arnentis Bustanul Arifin BUSTANUL ARIFIN Buty Kurnia Hamzani Chairul Chairul Citra Buhatika Efrizal Efrizal Efrizal Efrizal Elma Fadrita Rahman Evi Suryawati Hamdhan Fathony Hamzar Suyani Hilfi Pardi Imelda - Kiki Fatmala, Kiki Mariani Natalina Murdiman, Imelda Nadia Nadia Nilam Sari Nurmiati Nurmiati Nurmiati Nurmiati Olly Norita Tetra Olly Norita Tetra Putri Ramadhani Raesa Pratiwi Putri Rahmiana Zein Rusnam Rusnam Safni Safni Safni Safni Safni Safni Salmariza Sy Suci Wulandari Suryani, Hamzar Suwirmen, Suwirmen Umiati Loekman Umiati Loekman Umiati Loekman Vanella Indah Pratiwi Yulia - Yunita Salamah Zakaria, Indra Junadi Zuhri Syam Zuhri Syam