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All Journal VALENSI Jurnal Bahan Alam Terbarukan Jurnal Matematika & Sains SEMIRATA 2015 REKAYASA PROSIDING SEMINAR KIMIA REPOSITORY KIMIA KOVALEN: Jurnal Riset Kimia Jurnal Kimia Mulawarman ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry JURNAL ATOMIK Chemistry Indonesian Journal of Chemical Research Molekul: Jurnal Ilmiah Kimia JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Aman Sentosa Panggabean
Department Of Chemistry, FMIPA MUlawarman University-Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Potensi Pemanfaatan Ekstrak Kubis Ungu (Brassica oleracea L.) sebagai Indikator Asam Basa Alami Erwin -; Muhammad Asfian Nur; Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 13 No 1 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The study of potential use of extracts and fractions of purple cabbage (Brassica oleracea L.) as an indicator of acid-base has been conducted. This research aims to determine the color change at a certain pH to extract total, n-hexane, ethyl acetate and methanol fraction. Based on the results of the test changes color only total extracts and methanol fraction that is suitable as indicator. Statistical test that the t test for total titration end point extracts, t calculate is smaller than t table [0.4241 <2.776], it showed no significant difference between the endpoint using the total extract with bromine thymol blue indicator. While the endpoint for methanol fraction having t calculategreater than t table [6.323> 2.776],indicating the end point of the titration using methanol fraction was significantly different compared with bromine thymol blue indicator.Keywords: Brassica oleracea L, indicator, and acid-base
PEMANFAATAN TUMBUHAN SERAI WANGI (Cymbopogon nardus (L.) RENDLE) SEBAGAI ANTIOKSIDAN ALAMI Willem Hendrik G; Erwin -; Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 10 No 2 (2013)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The phytochemical test, brine shrimp lethality test and antioxidant activity test on secondary metabolits of serai wangi (Cympogon nardus (L.) Rendle) stalk have been completed. Samples are extracted by masseration method that is concentrated by using rotary evaporator. The methanol hard extract are then fractioned with n-hexan and etil n-hexane and ethyl acetate. Based on secondary metabolits phytochemical test of serai wangi (Cympogon nardus (L.) Rendle) stalk showed that methanol raw ekstract contains flavonoid, fenol and triterpenoid. n-hexane fraction extract contain steroid and ethyl Acetat fraction extract contains flavonoid, fenol and terpenoid. In brine shrimp lethality test, the increase larvae death data was recorded and processed using SAS Probit Analysis to determine the Lethal Concentration 50% (LC50) value. The results of this test showed that the most active fraction is n-hexane fraction with LC50 value of 86,9704 ppm. Based on the antioxidant activity by scavenging activity of DPPH used spectrophotometry was obtained that Inhibition Concentration 50% (IC50) of methanol extract is 67,18 ppm, extract of n-hexane fraction is 1.078,41 ppm, extract of ethyl acetat fraction is 68,96 ppm and vitamin C is 3,05 ppm.Keyword: Cympogon nardus (L.) Rendle, Phytochemical Test, Antioxidant Activity Test, DPPH.
PEMURNIAN ASAP CAIR DARI KULIT DURIAN DENGAN MENGGUNAKAN ARANG AKTIF Adhitya Rinaldi; Alimuddin Alimuddin; Aman Sentosa Panggabean
Molekul Vol 10, No 2 (2015)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (235.679 KB) | DOI: 10.20884/1.jm.2015.10.2.185

Abstract

Limbah kulit durian dapat diolah menghasilkan asap cair dan karbon aktif dengan metode pirolisis. Untuk menghasilkan asap cair yang dapat digunakan sebagai pengawet makanan, asap cair perlu di proses dengan metode pemurnian seperti destilasi, pemurnian dengan zeolit aktif dan arang aktif. Hasil karakterisasi asap cair dari kulit durian hasil pirolisis, destilasi, pemurnian dengan zeolit aktif dan pemurnian dengan arang aktif diperoleh nilai pH berturut-turut 4,09; 3,24; 3,46; dan 2,09. Kadar asam asetat berturut-turut 6,07; 7,59; 9,11; dan 10,63 (mg/L). Berdasarkan karakteristik komponen senyawa menggunakan GC-MS asap cair hasil pirolisis terdeteksi 17 senyawa, asap cair hasil destilasi 12 senyawa, asap cair pemurnian zeolit aktif 10 senyawa dan asap cair pemurnian arang aktif 6 senyawa dengan mayoritas komponen senyawa terdiri dari asam asetat, fenol dan karbonil serta tidak mengandung senyawa karsinogenik, sehingga asap cair dari kulit durian dapat digunakan sebagai pengawet makanan.
Prakonsentrasi Ion Cd(II) dalam Sampel Pupuk Nitrogen, Fosfor dan Kalium (NPK) Menggunakan Alumina Teraktivasi sebagai Material Pengisi Kolom Lossi Hotmaida Simanjuntak; Erwin Erwin; Aman Sentosa Panggabean
ALCHEMY Jurnal Penelitian Kimia Vol 16, No 2 (2020): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.16.2.39363.152-162

Abstract

Prakonsentrasi ion Cd(II) dalam sampel pupuk nitrogen, fosfor dan kalium (NPK) menggunakan alumina teraktivasi sebagai material pengisi kolom telah dilakukan. Alumina terlebih dahulu diaktivasi dengan NaOH pada pH 8 sebelum dimasukkan ke dalam kolom. Beberapa parameter penting dalam tahapan prakonsentrasi yang dapat meningkatkan kinerja analitik pengukuran telah ditentukan menggunakan instrumen spektrofotometer serapan atom (SSA). Hasil penelitian menunjukkan kondisi optimum tahapan prakonsentrasi ion Cd(II), adalah pada volume sampel 10 mL, volume HNO3 adalah 4 mL pada konsentrasi 0,5 M, dengan nilai kapasitas retensi adalah 1,4113 mg Cd(II)/g alumina. Kinerja analitik pengukuran metode sangat baik, ditunjukkan dengan nilai batas deteksi metode adalah 2,7997 μg/L. Presisi metode dinyatakan sebagai persentase koefisien variansi adalah 4,03%. Penggunaan alumina sebagai bahan pengisi kolom dapat meningkatkan signal sebesar 2,5 kali dibandingkan dengan pengukuran ion Cd(II) secara langsung. Akurasi metode ini sangat baik, dengan nilai persen perolehan kembali adalah 91,67 – 103,49%, menunjukkan bahwa matriks sampel tidak  mempengaruhi hasil pengukuran, sehingga metode ini dapat digunakan untuk analisis ion Cd(II) dalam sampel pupuk NPK. Estimasi ketidakpastian metode ini juga telah dihitung dan ditunjukkan dengan nilai persen ketidakpastian adalah 14,16%.Preconcentration of Cd(II) Ion in Nitrogen, Phosphor, and Kalium (NPK) Fertilizer Sample Using Activated Alumina as a Column Filler Material. The research about preconcentration of Cd(II) in NPK fertilizer using activated alumina as a column filler material was done. The column used a filler material of alumina previously activated using NaOH at pH 8. Some important parameters in the preconcentration stage are able to increase the analytical performance, determined using atomic absorption spectrophotometer (AAS). The result of the research shows the optimum condition of preconcentration stage Cd(II) ion are volume of the sample was 10 mL, the volume of eluent HNO3 was 4 mL with a concentration of 0.5 M, with the retention of capacity value was 1.4113 mg Cd(II)/g alumina. The analytical performance of this method is good, shown with the limit of detection value was 2.7997 μg/L. The precision of this method was indicated by the percentage of the coefficient variance of 4.03%. Alumina used as a filler column can increase the signal up to 2.5 times for direct Cd(II) ions measurement. The accuracy of this method is excellent, with the recovery percentage value was 91.67 – 103.49%, indicating that the matrices of NPK fertilizer give no effect on the results of measurements, and this method was capable of analyzing Cd(II) ions in NPK fertilizer. The uncertainty of this method was estimated as the percentage of the uncertainty of 14.16%.
Validasi Metode Penentuan Benzena, Toluena dan Xilena pada Sampel Udara dan Tanah Menggunakan Kromatografi Gas Aman Sentosa Panggabean; Tika Widyastuti; Noor Hindryawati
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 1 (2019): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (398.077 KB) | DOI: 10.20961/alchemy.15.1.25522.177-189

Abstract

Penelitian tentang validasi metode penentuan kadar benzena, toluena dan xilena pada sampel udara dan tanah dengan menggunakan kromatografi gas telah dilakukan. Untuk mendapatkan hasil pengukuran yang valid, beberapa parameter penting yang berpengaruh dalam validasi metode telah ditentukan. Beberapa parameter penting yang dilakukan adalah penentuan besaran dasar kromatografi yang meliputi: waktu retensi, kapasitas (k’), faktor selektivitas (α) dan kinerja analitik yang meliputi: penentuan linearitas (r), limit deteksi (LOD), limit kuantitasi (LOQ), presisi dan akurasi. Hasil penelitian penentuan kinerja analitik sangat baik ditunjukkan oleh nilai presisi sebagai % KV < 2/3 nilai KV Horwitz, LOD untuk masing-masing senyawa benzena, toluena dan xilena adalah 0,02 mg/L; 0,59 mg/L dan 0,08 mg/L serta LOQ untuk masing-masing senyawa benzena, toluena dan xilena adalah 0,07 mg/L; 1,99 mg/L dan 0,27 mg/L. Akurasi  metode ini sangat baik ditunjukkan dengan nilai presentase perolehan kembali masing-masing senyawa benzena, toluena dan xilena untuk sampel tanah sebesar 102,61 ± 4,61%; 101,65 ± 7,41%; 102,15 ± 4,15%, dan untuk sampel udara masing-masing senyawa sebesar 101,69 ± 5,77%; 102,08 ± 5,43% dan 98,55 ± 5,11%. Berdasarkan hasil penelitian ini, metode kromatografi gas dapat digunakan dalam penentuan benzena, toluena dan xilena pada sampel udara dan tanah dengan memberikan hasil yang valid.Validation Method on The Determination of Benzene, Toluene and Xylene in Air and Soil Samples Using Gas Chromatography. The present study investigated the method for the determination of the content of benzene, toluene, and xylene in air and soil samples using gas chromatography. To obtain a valid measurement result, several important parameters that influence the method validation have been determined. The several important parameters carried out are the determination of the basic chromatographic such as retention time, capacity factor (k'), selectivity (α) and analytical performance measurement includes: the determination of linearity (r), limit of detection (LOD), limit of quantitation (LOQ), precision and accuracy. The result of analytical performance of the research are well verified, in which the value of precision was % CV < 2/3 CV Horwitz value, LOD for benzene, toluene, and xylene compound were 0.02 mg/L, 0.59 mg/L, 0.08 mg/L, respectively, and LOQ for benzene, toluene and xylene compounds was 0.07 mg/L, 1.99 mg/L and 0.27 mg/L respectively. This method achieved high accuration, indicated by a percentage of recovery value of benzene, toluene, and xylene for soil samples of 102.61 ± 4.61%; 101.65 ± 7.41%; 102.15 ± 4.15%, and for air samples was 101.69 ± 5.77%, 102.08 ± 5.43%, and 98.55 ± 5.11% respectively. Based on the results of this research, the method presented in this study can be applied for the determination of benzene, toluene, and xylene using gas chromatography in air and soil samples with valid results.
Preconcentration of Chromium(VI) at Trace Levels Using Acid Alumina Resin with Column Method Aman Sentosa Panggabean; Subur P Pasaribu; Bohari Bohari; Nurhasanah Nurhasanah
Indonesian Journal of Chemistry Vol 14, No 1 (2014)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (345.044 KB) | DOI: 10.22146/ijc.21267

Abstract

Trace analysis of Chromium(VI) ions using acid alumina resin as a filler material column in preconcentration system by off-line method has been carried out. Alumina resin was activated with H2SO4 at pH 1 before being filled to the column. This research showed retention capacity of alumina acid resin was 3.955 mg Cr(VI)/g resin. The analytical performance of this method is good, shown with the limit of detection value was 3.648 µg/L. The reproducibility of this method shown as percentage of coefficient variance was 2.06%. Acid alumina used as resin filler column can increase the signal up to 15.36 times for direct Cr(VI) ions measurement. The accuracy of this method is very good with the recovery percentage value > 95%, shown the matrices of water samples didn’t effect the results of measurements and this method was capable to analyze Cr(VI) ions in water samples at the trace levels.
PREPARATION AND CHARACTERIZATION ION SELECTIVE ELECTRODE Cd(II) BASED ON CHITOSAN IN PVC MEMBRANE A. Sentosa Panggabean
Indonesian Journal of Chemistry Vol 11, No 3 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (266.706 KB) | DOI: 10.22146/ijc.21394

Abstract

Preparation of the chitosan membrane of ion-selective electrode for determination of cadmium ion has been conducted. Chitosan is a natural polymer containing nitrogen could coordinate with Cd2+ to increase the membrane conductivity value. Chitosan is a principal material and mixed with polyvinylchloride (PVC) as matrix dissolved previously to solvent tetrahydrofuran (THF) and dioctylphenylphosphonate (DOPP) is added as plasticizer by proportion chitosan:PVC:DOPP (6:3:1). To obtain the dopant optimum concentration, membrane was dipped in Cd2+ for 7 days and its conductivity value was measured using the four-point probe method. From FT-IR spectrum the peaks of amine, acetylamide and hydroxy groups wavelength number was observed to assure that Cd2+ bound to the chitosan. The optimum concentration of Cd2+ dopant was obtained at 1.00 M with conductivity value of 549.45 ohm-1m-1 wich gave a Nernstian factor of 32.03 mV/decade with the detection limit of 2.512 x 10-5 M. The electrodes work in the pH range 3 - 7. The life time of the electrode was 8 weeks. The ions of Ni2+, Fe3+, Pb2+, Cu2+, Zn2+, Cl- and SO42- toward concentration range 10-3 M gave response did not interfere in the determine of Cd2+ ion.
INTEGRATED GAS-LIQUID SEPARATOR-REACTOR FOR DETERMINATION Sn(II) AT TRACE LEVELS IN SOLUTION A. Sentosa Panggabean; M. Bachri Amran; Buchari Buchari; Subur P. Pasaribu
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.373 KB) | DOI: 10.22146/ijc.21479

Abstract

The determination of Sn(II) ion at trace levels using integrated gas-liquid separator-reactor with hydride generation-quartz furnace atomic absorption spectrophotometer (HG-QFAAS) has been done. This modified gas-liquid separator at various sizes was able to increase sensitivity in the determination of Sn(II) in solution. The acid reagent mixing techniques, sample and reductant optimally occurs in a coil reaction before they are going to the gas-liquid separators. The optimum conditions of parameter measurement in the determination of Sn ion with HG method are influenced by type and concentration of acid, and the concentration of reductant has been evaluated. This optimum parameters can increase of analytical performance simultantly, which is shown by detection limit 3.74 mg L-1 for 100 mL injection volume (3.74 pg Sn). The accuracy of measurement shown by the % recovery of the Sn determination in natural water sample at > 95%, indicate this technique is good to be applied for tin analysis at picogram level.
The Utilization of Nitrogen Gas as a Carrier Gas in the Determination of Hg Ions Using Cold Vapor-Atomic Absorption Spectrophotometer (CV-AAS) Aman Sentosa Panggabean; Subur P Pasaribu; Farida Kristiana
Indonesian Journal of Chemistry Vol 18, No 2 (2018)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (251.996 KB) | DOI: 10.22146/ijc.23092

Abstract

The research about utilization of nitrogen gas as a carrier gas in the determination of Hg ions by using Cold Vapor-Atomic Absorption Spectrophotometer (CV-AAS) method has been conducted. To optimize the measurement results, several parameters that affect hydride generator have been studied. Some specified important parameters are SnCl2 concentration as reductant, acid concentration, and the analytical performance such as repeatability and reproducibility (% RSD), linearity (r), limits of detection (LOD) and limits of quantitation (LOQ), and accuracy have been studied. The results of the research showed that the nitrogen gas can be used instead of argon gas as a carrier gas. It was shown by the repeatability values as % RSD < 2/3 CV Horwitz values, the LOD was 0.0338 µg/L and the LOQ was 0.0838 µg/L. The accuracy of this method was well shown by a recovery percentage was 102.24%. Based on the result of this research, the nitrogen gas can be used as a carrier gas for the determination of Hg ions by using the CV-AAS method with valid results.
PEMANFAATAN AIR ASAM TAMBANG BATUBARA SEBAGAI SUMBER ENERGI LISTRIK ALTERNATIF Fatimah Islamunisa; Bohari -; Aman Sentosa Panggabean
JURNAL ATOMIK Vol 3 No 1 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (441.682 KB)

Abstract

The research about utilizing Acid Mine Drainage (AMD) as source of electrical energy has done. The variables of the observations made in the influence of electrode, number of cells and the working time of the cell. The results showed that the electrode, the number of cells and the working time of the cell affect the potential value of cells. The pair of electrodes of the metal cooper (Cu), Zinc (Zn), Carbon (C) have been varied showed the potential value of the most high by using a pair of electrodes C-Zn amounting to 1.68 V. More the number of cells that are used the higher the potential value that is produced, where the use of cells from 1 until 5 consecutive potential values of the cells produced are 1.57 V; 3.28 V; 4.90 V; 6.57 V; 8.20 V. The working time of the cell the longer it is used the more reduced the potential value of what is produced, where from 0 h, 3 h, 6 h, 9 h, 12 h and 15 h respectively the potential value of the cells produced are 1.63 V; 1.61 V; 1.59 V; 1.57 V; 1.56 V.
Co-Authors -, Yasrin Adha, Laila Sufina Adhi Surya Pranata Surya Pranata Adhi Surya Pranata Surya Pranata, Adhi Surya Pranata Surya Adhitya Rinaldi Akhmad Rifani Akkas, Erwin Ali Murtopo Alimuddin Alimuddin - Alimuddin Alimuddin Alimuddin Alimuddin Alimuddin Alimuddin Alimuddin Alimuddin Alya Yuni Maulana Amrina Rosyada Anggun Ridha Avitri Ani Trisnawati Anwar, Adliah Arif, Moh. Syaiful Arifin Syam Surya arifin syam syam Az Zahra, Upi Fathimah Bagus Muliawan Bayu Iskandar Bohari - Bohari Bohari Bohari Bohari Bohari Yusuf Bohari Yusuf Buchari Buchari Buchari Buchari Budiono, May Cahaya, Tentriati Chairul Saleh Darmin - Darwin, Chepy Dirgarini Julia Nurlianta Subagyono Eka Apriska S Kusuma Erwin - Erwin Erwin Erwin Erwin Erwin Erwin Erwin Erwin Erzha, Nutfahryza Fadilah Ramadhani Farida Kristiana Farlianti, Resma Lita Fatimah Islamunisa Filus, Tio Fitriana, Mila Friscylia Friscylia Gaanty Pragas Maniam, Gaanty Pragas Hariati, Hariati Hariati, Hariati Harum Widyastuti Hening Ayu Marinda Hutagalung, Sandi Christopher Idris Mandang, Idris Irviansyah, Alfian Iskandar, Bayu Joni Rahman Josephine Josephine, Josephine Juntia Kirana Pratiwi Khasanah, Manja’a Kumalasari, Anisa Kurniasih, Ririn Feby Kusmiaty, Prilianda Leonardus Lewo Hayon Lianasari, Ika Yekti Lossi Hotmaida Simanjuntak Lumban Gaol Veronica Destiana M. Bachri Amran Manja’a Khasanah Margaretta D. R. N. S Marvin Horale Pasaribu May Budiono Mayang, Julia Agustin Menono, Fera Friskaneke Mila Fitriana Muhammad Asfian Nur Muhammad Bachri Amran Muhammad Rizky Muhammad Robiansyah Nanang Tri Widodo Nanang Tri Widodo Nauval Dwi Fadillah Nazaratun Thaiyibah Noor Hindryawati Noor Hindryawati, Noor Nur, Nana Septiana Nurhasanah Nurhasanah Oktavia, Dwina Putri Oktaviani, Reka pakasi, Resy Prayuda, Adif Putri, Amelia Putri, Rinda Anisyah RAHMAT GUNAWAN Rahmat Gunawan Rani Novia Ulya Rida Awliyani Rientha Septiana Rika anggraini Rina Rina Ristia Asri Fidayana Rita Hairani Rudi Kartika, Rudi Rumengan, Nur Khamillah Sadijah Achmad Saepudin Suwarsa Saibun Sitorus Saibun Sitorus Sandi Christopher Hutagalung Sari, Ermalia Lintang Sari, Ika Yekti Liana Sari, Rahma Juwita Septiana, Rientha Shintia Alifah R Soerja Koesnarpadi Soerja Koesnarpadi Subagyono, Dirgarini Julia Nurlianti Subur P Pasaribu Teguh Wirawan Teguh Wirawan, Teguh Tika Widyastuti Tio Filus Trisnawati, Ani Victoria, Stefanie Willem Hendrik G Wirdhaningsih Wirdhaningsih Yasser Arafat Yulianti Kartika Yulieta, Afifah Nur Yusuf, Irfan Maulana