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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

Author-ID : 368344

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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PENENTUAN Cu, Pb, Cd, dan Zn DALAM AIR SECARA STRIPPING POTENTIOMETRI DENGAN ELEKTRODA KONVENSIONAL DAN KOMBINASI E. Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 2, No. 2 Juli 2008
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (976.69 KB)

This paper discusses the development of stripping potentiometric methods for reliable determination of Cu,Pb, Cd, and Zn in natural water. The electrode systems used were the conventional and combined ones. Theformation of intermetallic compound between Cu and Zn was overcame with the addition of gallium ions. Themethod involved two stripping cycles during which copper was initially determined on its own, followed bysimultaneous determination of Pb, Cd and Zn after addition of 150 mg/L gallium ions. The optimum conditions forreliable determination of the metals with the use of the conventional electrode were 0.01 M HCl, 10 mg/L Hg (II), adeposition potential of -1200 mV and a deposition time of 30 seconds, while those with the use of the combinedelectrode included 0.01 M HCl, 10 mg/L Hg (II), a deposition potential of -700 mV for Cu and -1300 mV for theother three metals and a deposition time of 10 seconds. It was also found that the use of the combined electrode gavelower detection limit and wider linear concentration range for the four metals.

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BATANG TANAMAN GUMITIR (Tagetes erecta) YANG DIAKTIVASI DENGAN H3PO4 Emmy - Sahara; Wahyu Dwijani Sulihingtyas; I Putu Adi Surya Mahardika
Jurnal Kimia (Journal of Chemistry) Vol. 11. No. 1 Januari 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Paper ini membahas pembuatan dan karakterisasi arang aktif dari batang tanaman gumitir (Tagetes erecta) dengan aktivator H3PO4. Penelitian ini bertujuan untuk membuat dan menentukan karakteristik arang aktif dari limbah batang tanaman gumitir serta menentukan konsentrasi optimum H3PO4 yang dibutuhkan untuk mendapatkan arang aktif dengan karakteristik yang baik ditinjau dari kadar air, kadar zat mudah menguap, kadar abu total, kadar karbon, daya serap terhadap metilen biru, dan daya serap terhadap iod. Selain itu, dilakukan juga analisis spektra secara FTIR terhadap arang aktif dengan karakteristik yang terbaik. Secara umum, bila dibandingkan dengan standar mutu SNI 06-3730-1995 tentang arang aktif teknis maka aktivasi dengan berbagai konsentrasi H3PO4 dalam penelitian ini menghasilkan arang aktif dengan karakteristik yang baik, akan tetapi aktivasi dengan asam fosfat sebesar 15% menunjukkan karakteristik yang terbaik yaitu: kadar air 4,67 ± 0,33%, kadar zat mudah menguap 5,59 ± 0,33%, kadar abu 5,67 ± 0,33%, kadar karbon 84,33%, daya serap terhadap metilen biru sebesar 162,84 ± 0,50 mg/g dan daya serap terhadap I2 sebesar 759,62 ± 3,07 mg/g. Hasil identifikasi dengan spektrofotometer FTIR menunjukkan bahwa arang aktif tersebut mengandung gugus fungsi OH, C-H alifatik, P=O dan P-OH.

OPTIMASI WAKTU AKTIVASI DAN KARAKTERISASI ARANG AKTIF DARI BATANG TANAMAN GUMITIR DENGAN AKTIVATOR NaOH E. Sahara; I K. Y. Resyana; A. A. I. A. M. Laksimawti
Jurnal Kimia (Journal of Chemistry) Vol.14 No.1 Januari 2020
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The stems of marigold plant can be used as the raw material for making activated carbon. One of the activators that can be used is NaOH with an activated time of 24 hours. The purpose of this study was to obtain an effective activation time through activation with a 2.5% NaOH activator in several variations of activation time followed by characterizing the activated carbon formed. Characterization which was carried out including the determination of water, volatile matter, ash, carbon contents, as well as the absorption capacity of methylene blue and iodine. The results of the study showed that the activation for 28 hours produced an activated carbon with characteristics in accordance with SNI 06-3730-1995, namely: water content (8.40 ± 0.72)%, volatile matter content (9.58 ± 0.95) %, ash content (4.93 ± 0.83)%, carbon content of 77.09%, absorption of iodine (758.66874 ± 1.21) mg/g and absorption of methylene blue 124.6226 mg/g. The results of the analysis with FTIR spectrophotometer on this activated charcoal showed the presence of OH, CH aliphatic, C = O and C = C functional groups. Keywords: activated carbon, sodium hydroxide, marigold plant stems

ISOLASI DAN IDENTIFIKASI SENYAWA AKTIF ANTI BAKTERI PADA DAUN HERBA SISIK NAGA (Drymoglossum piloselloides Presl.) Gde Agus Surya Cahyadi; I Gusti Agung Gede Bawa; Emmy Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 1 Januari 2014
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

This paper discusses the isolation and identification of active compounds from the anti bacterial herb leaf of dragon scales (Drymoglossum piloselloides Presl.). 500 grams of dried leaf powder of dragon scales produced 26.4376 grams of concentrate ethanol extract. Phytochemical test showed that the ethanol extract containing compounds of flavonoid, triterpenoid and polyphenol. The results of the partition of the ethanol extract using n - hexane, chloroform and n - butanol, followed by evaporating yielded 3.8824 g of concentrate extract of n- hexane, 9.1124 grams of concentrate extract of chloroform and 4.4921 grams of concentrate extract of n-butanol. Anti-bacterial activity assay sugested that the concentrate extract of n - butanol showed the greatest inhibition activity against bacteria of Staphyloccocus aureus, which was of 0.90 cm. The concentrate extract of n - butanol was then separated and purified, and hence 0.2323 grams of anti- bacterial extract was obtained. The result of the phytochemical test showed that the active isolate of herb leaf of dragon scales was flavonoid compound. Identification by UV - Vis spectrophotometry gave two absorption bands in the ultraviolet region. The first band was at the wavelength of 318.00 nm and the second one at the wavelength of 271.50 nm. These results indicated that the active isolates containing electronic transitions of ? ? ?* of an aromatic compound and n ? ?* of an aromatic compound as well which are the characteristic of flavonoid compounds. Identification by infrared spectrophotometry showed that the active isolates containing hydroxyl group (- OH ) which appeared at the wave number of 3512.37 cm- 1 ; o - hydroxy aryl ketones at the wave numbers of 2924.09 cm??- 1 and 2858.51 cm- 1 with medium intensity and broaden band. It was also observed the presence of benzene trisubstituted (1,2,3 or 1,3,5 - trisubstituted) at the wavelength of 1734.01 cm- 1 with medium intensity and broaden band.

BIOAVAILABILITAS DAN SPESIASI LOGAM BERAT Pb DAN Cd PADA TANAH PERTANIAN BASAH DAN KERING DI DAERAH DENPASAR I Made Siaka; Emmy Sahara; Gusti Agung Putu Merta Dharmayoga
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

A research on the bioavailability and speciation of Pb and Cd in wet and dry soils in some agricultural areas in Denpasar has been carried out. Samples were taken from agricultural land in Peguyangan and Kesiman areas. This study was aimed to determine the total metal concentrations and the fractions of the species of Pb and Cd, as well as the level of the metal bioavailabilities. The study included the determination of the total Pb and Cd concentrations in the samples and extraction of the metal through the application of the sequential extraction technique followed by measurement of the metal with the Atomic Absorption Spectrophotometer. The result showed that generally the concentrations of Pb and Cd total in the wet soil from the two sampling areas were higer than those of the dry soil which were varied between 14,0484-16,1072 mg/kg and 1,5983-1,9885 mg/kg respectily.the results for Pb speciation in wet and dry soils from both locations as follows : the bioavailable fraction (EFLE fraction) and potentially bioavailable (consisting of Fe/Mn oxides and organic-sulfide fractions) were of 29,81%-83,66% and 2,44%-13,96 %, respectily, while the resistant (non-bioavailable) fraction were of 28,55%-55,11%. The results for Cd speciation in wet and dry soils from both locations were as follows : the bioavailable an potentially bioavailable fractions were of 28,62%-67,87% and 7,63%-48,39%, repectily, while the resistant (non-bioavailable) fractions were of 10,68%-30,92%.

SEQUENTIAL EXTRACTION UNTUK PENENTUAN BIOAVAILABILITAS LOGAM Co DAN Ni DALAM SEDIMEN DI KAWASAN PERAIRAN PELABUHAN BENOA DENPASAR BALI Yulius Leo Adeputra; Emmy Sahara; A. A. I. A. M. Laksmiwati
Jurnal Kimia (Journal of Chemistry) Vol. 9, No. 2 Juli 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

This research was aimed to establish the total concentrations of Ni and Co and then to determine the fractions of various species of the two metals in the sediments. The bioavailability of Co and Ni was determined using sequential extraction technique. The total concentrations of Co and Ni obtained in the sediment were 27.2484 mg/Kg and 41.9458 mg/Kg, respectively. The speciation of Co and Ni found the sediment were 29.83% and 55.86 % in the EFLE fraction; 4.04% and 6.40% in the fraction of Fe / Mn oxides; 13.72 % Co and Ni not detectable in the organic-sulfide fractions; 46.15% and 38.14% in the resistant fraction. Therefore the bioavailability of Co and Ni obtained in the Benoa Port sediment were of 12.9653mg/Kg and 23.3565 mg/Kg respectively.

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

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.

PROFILING KIMIA SAMPEL KOKAIN SITAAN DI BALI DENGAN KROMATOGRAFI LAPIS TIPIS – SPEKTROFOTODENSITOMETRI I Made Agus Gelgel Wirasuta; Kusuma Hidayatullah; Emmy Sahara; Roedy Aris Tavip
Indonesian Journal of Legal and Forensic Sciences (IJLFS) Vol 2 (2012): Indonesian Journal of Legal and Forensic Sciences
Publisher : Penerbit, sejak 2012 : Asosiasi Ilmu Forensik Indonesia dan UPT Lab. Forensik Sain dan Kriminilogi - Universitas Udayana

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The seized cocaine samples by Narcotic Police in Denpasar have been carried out profiling. Cocaine’s were eluted on Al-TLC Si GF254 and spot scanned on Spectrophotodensitometric-method. Eight seized cocaine’s were presented relative peaks pattern, with chromatograms similarity of 99.81%. Based on the similarity, all of cocaine’s, could be classified into one group or same origin.

Teknik Voltammetri Pelucutan Anodik Menggunakan Elektroda Glassi Karbon dalam Penentuan Kadar Logam Fe dalam Terong Ungu Irdhawati Irdhawati; Vivi Eka Indrayani; Emmy Sahara
Jurnal Kimia Riset Vol. 4 No. 2 (2019): Desember
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v4i2.15897

Terong ungu adalah salah satu jenis tanaman yang banyak dibudidayakan. Tingginya permintaan terong menyebabkan petani menggunakan pupuk dan pestisida dari bahan kimia untuk meningkatkan produksi. Penggunaan bahan kimia yang berlebihan dapat mencemari lingkungan. Dalam penelitian ini kadar logam Fe dalam terong ungu ditentukan dengan teknik voltammetry pelucutan anodic. Elektroda kerja yang digunakan adalah glassi karbon, Ag/AgCl sebagai elektroda pembanding, dan kawat platina sebagai elektroda lawan. Parameter pengukuran yang dioptimasi meliputi waktu deposisi, potensial deposisi, dan laju pindai. Selanjutnya dilakukan validasi rentang konsentrasi linier, limit deteksi, limit kuantisasi, keberulangan, dan perolehan kembali. Hasil yang diperoleh yaitu waktu deposisi optimum selama 40 detik, potensial deposisi optimum pada -0,27 V, serta laju pindai 2,5 mV/s. Linieritas larutan standar Fe berada pada rentang 5 sampai 100 mg/L, dengan koefisien korelasi 0,9964. Limit deteksi dan limit kuantisasi berturut-turut 18,36 mg/L dan 37,79 mg/L. Keberulangan pengukuran menghasilkan nilai rasio Horwitz yang lebih kecil dari dua. Perolehan kembali standar logam Fe yang ditambahkan ke dalam larutan sampel diperoleh 100,00 ± 0,07%. Kadar Fe dalam terong ungu pada kondisi pengukuran optimum diperoleh 80,40 ± 1,85 mg/kg. Nilai tersebut lebih kecil dari Standar Nasional Indonesia (SNI) untuk kadar logam dalam bahan pangan yaitu 5000 mg/kg.

Serbuk Gergaji Kayu Jati Teraktivasi EDTA Sebagai Penjerap Ion Tembaga (II) dan Krom (III) Irdhawati Irdhawati; Ni Nyoman Triyunita Sinthadevi; Emmy Sahara
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): Edisi Bulan Januari (Edition for January)
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2020.7-ird

Teak sawdust is a waste of the furniture industry. The main compound content is cellulose, which contains hydroxyl groups so that can be used as adsorbent. This work aims to determine adsorption capacity and isotherm adsorption pattern of teak sawdust activated by EDTA for copper (II) dan chromium (III) ions. Some parameters were optimized including the ratio of adsorbent and EDTA, and contact time. The results showed the optimum ratio of teak sawdust and EDTA was 2:3, and the optimum contact time was 105 minutes. Both of isoterm adsorption patterns of teak sawdust to Cu (II) and Cr (III) ions follow the Freundlich equation, with determination coefficient close to one. Optimum adsorption capacity was obtained 46.5 and 39.7 mg/g for Cu (II) and Cr (III), respectively.

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

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