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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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DISTRIBUSI Pb DAN Cu PADA BERBAGAI UKURAN PARTIKEL SEDIMEN DI PELABUHAN BENOA E. Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
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 (258.64 KB)

This paper discusses the distribution of Pb and Cu in various particle sizes of sediment collected fromBenoa Bay, Bali. The particle sizes of sediment observed were >300; 300 – 100; 100 – 88,88 – 63 and <63 mm. Priorto the determination of both heavy metals, the sediments were digested with the mixture of HNO3 and H2O2 (1:1) at120oC. The measurements of the metal concentrations were performed by the use of Atomic AbsorptionSpectroscopy technique with the application of calibration method.It was found that the smaller the particle sizes the higher the metals concentraions were. The sediment of>300 mm contained Pb and Cu 0,74 – 0,77 mg/kg and 0,15 – 9,24 mg/kg, respectively. On the other hand, thesediment of < 63mm contained 21,36 – 53,01 mg/kg Pb and 104,14 – 132,82 mg/kg Cu. It was also observed thatthe distribution of particle sizes of all sediment collected from four sampling locations had similar patern.

SPESIASI DAN BIOAVAILABILITAS LOGAM TEMBAGA (Cu) PADA BERBAGAI UKURAN PARTIKEL SEDIMEN DI KAWASAN PANTAI SANUR Kristina Indra Yanthy T; Emmy Sahara; I G. A. Kunti Sri Panca Dewi
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 2 Juli 2013
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 bioavailability and speciation of Cu in various sediment particle sizes collected from three sampling sites namely, Sanur, Sindhu and Mertasari Beaches along Sanur Beach was carried out. This study was aimed to determine the fractions of Cu available for aquatic organism and the geochemical forms of Cu in the sediments. Samples pretreatment were carried out by digestion with the use of the mixture of HNO3 and HCl (3:1). The bioavailability and speciation were accomplished by the appliation of single exraction (with EDTA and HCl ) and sequential extraction techniques. Generally, it was found that EDTA extraction yielded higher bioavailability than that of HCl extraction. The highest bioavailability of Cu was showed by the sediment from Sanur Beach and Sindhu Beach at particle size of < 63 µm and from Mertasari Beach at particle size of 63-106 µm. From Cu speciation results it was found that the bioavailable (fractions of easily, freely, leachable, and exchangeable (EFLE), Fe/Mn oxide, organic and sulphide) and the resistant fractions were as follows: Sanur Beach at particle size of <63 µm were 8,28% and 10,31%, particle size of 63-106 µm were 5,34% and 9,13%, and particle size of >106 µm were 18,07% and 5,26%. Sindhu Beach at particle size of <63 µm were 17,32% and 15,69%, particle size of 63-106 µm were 6,98% and 9,92%, and particle size of >106 µm were 7,28% and 7,77%. Mertasari Beach at particle size of <63 µm 8,85% and 11,79%, particle size of 63-106 µm were 13,33% and 20,85%, and particle size of >106 µm were 17,99% and 38,42%.

REGENERASI LEMPUNG BENTONIT DENGAN NH4+ JENUH YANG DIAKTIVASI PANAS DAN DAYA ADSORPSINYA TERHADAP Cr(III) Emmy Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 1 Januari 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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This paper discusses the adsorption capacity of bentonite clay to Cr (III) which was previously regenerated with saturated NH4+ and heat activated. The clay regenerated was the clay that have been used for adsorption of Cr(III) in solutionIt was found that bentonite clay regenerated and heated at 150oC had the highest specific surface area and porous total volume which were 119.9632 m2/g and 107.3561 x 10-3 mL/g, respectively. The distribution of the porous size was bimodal, namely microporous and mesoporous, whereas the isotherm patern observed was classified as the L type. The highest surface acidity of 2.3644 mmol/g was showed by the clay that was heated at 350oC with active situs of 1.4238 x 1021 atom/g. The adsorption capacity of the clay increased with temperature. The highest adsorption capacity of 19.878 mg/g was shown by the clay that regenerated and activated at 150oC.

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BAMBU APUS (Gigantochloa apus) DENGAN AKTIVATOR H3PO4 M. Manurung; E. Sahara; P. S. Sihombing
Jurnal Kimia (Journal of Chemistry) Vol.13 No.1 Januari 2019
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 manufacture and characterization of activated carbon from bamboo apus (Gigantochloa apus) with H3PO4 activator. The aims of study were to determine the optimum carbonization temperture and time as well as the amount of phosphoric acid required as the chemical activator. In addition, the activated carbon was also characterized following the Indonesian National Standard (SNI-1995) for activated carbon. Tthe activated carbon functional groups was determined using FTIR spectroscopy. The result showed that the optimum temperature of carbonization was 600oC, the carbonization time was 90 minutes and the phosphoric acid required was 20 gram for 1 gram carbon. Under these conditions, the activated carbon resulted met SNI-1995 with the characteristics as follows: the water content was (1.11±0.83%), the level of volatile substances was (8.13± 0.27%), the total ash amount was (7.33±1.35%), the carbon contents was (83.40±0.27%). and the absorption capacities of iodine and methylen blue were of 1057.75 mg/g, 472.88 mg/g, respectively. FTIR identification indicated the existence of some functional groups, namely aromatik, ketone, and hydroxyl.

REVIEW: POTENSI TANAMAN MARIGOLD (Tagetes erecta ) SEBAGAI FITOREMEDIATOR E. Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 16, No.1, Januari 2022
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 | DOI: 10.24843/JCHEM.2022.v16.i01.p14

Fitoremediasi adalah salah satu tehnik alternatif dalam usaha pemulihan lingkungan tanah, air maupun udara yang telah tercemar oleh berbagai macam polutan menggunakan tanaman hijau dalam keadaan hidup. Tujuan dari penulisan paper ini adalah untuk memberikan gambaran yang komprehensif mengenai pemanfatan tanaman marigold spesies Tagetes erecta sebagai suatu fitoremediator. Metode yang digunakan untuk mengumpulkan dan menelaah bahan review adalah studi literatur yang sistematis dari berbagai sumber, diantaranya researchgate, google schoolar, sciensedirect serta sumber lainnya. Dari telaah yang telah dilakukan dapat diketahui bahwa tanaman Tagetes erecta dapat digunakan sebagai fitoremediator lingkungan yang tercemar berbagai macam polutan. Kata kunci: fitoremediator, marigold, Tagetes erecta. Phytoremediation is an alternative technique which is used to restore the soil, water as well as the air contaminated by heavy metals and other pollutants using live green plants. The purpose of the writing of this paper is to provide a comprehensive picture of the use of marigold plant species of Tagetes erecta as a phytoremediator. The method applied to collect and review the materials was a systematic literature study using various sources, including researchgate, google schoolar, sciencedirect and other sources. From the study carried out, it can be seen that Tagetes erecta can be used as a phytoremediator in an environment contaminated with various pollutants. Keywords: marigold, phytoremediator, Tagetes erecta.

FRAKSINASI DAN BIOAVAILABILITAS LOGAM BERAT Fe DAN Mn PADA SEDIMEN DI PELABUHAN BENOA Emmy Sahara; Ida Ayu Gede Widihati; I Gede Darma Putra
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 metal fractionation and bioavailability of Fe and Mn in sediments collected from the area of Benoa Bay at Bali has been carried out. The purpose of this study was to determine the fraction of Fe and Mn in the sediments and their bioavailabilities. Fractionations were achieved by the Sequential Extraction methods during which various solutions were employed. Measurement of the concentration of both metals was done by using Atomic Absorption Spectrofotometer with a calibration curve method. The concentrations of total Fe and Mn in the sediment obtained were of 668.2948 mg/kg and 321.5761 mg/kg, respectively. The results of Fe and Mn fractionations in sediments were as follow: the fraction of freely, leachable and exchangeable (EFLE) were of 27.74% and 24.31%, the fractions of Fe/Mn-oxides were of 23.55% and 19.99%, organic and sulfide fraction were of 25.14% and 26.11% while the resistant fraction were of 23,57% and 29,59%, respectively. It Therefore, the results showed that the bioavailable and the resistant fractions for Fe in the sediment were of 76.43% and 23,57%, respectively while for Mn were of 70.41% and 29,59%, respectively

TEKNIK VOLTAMETRI PELUCUTAN ANODIK UNTUK PENENTUAN KADAR LOGAM Cu(II) PADA AIR LAUT PELABUHAN BENOA Irdhawati Irdhawati; Emmy Sahara; I Wayan Hermawan
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 1 Januari 2016
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

In this research, determination of Cu(II) using anodic stripping voltammetry were conducted by measuring the current peak of Cu(II) standard solution and the concentration of the metals in the seawater around Benoa Port. Deposition time and scan rate was optimized before validation. Parameters of the method validation examined were linear range concentration, limit of detection, repeatability, and % recovery. Seawater samples were collected from two different locations, which were Dermaga Ikan Tuna and Dermaga 2. The result showed the optimum deposition time and scan rate were 540 s and 7 mV/s. Linear range concentrations were 50 to 1000 ppb with correlation coefficient of 0,9998 and the detection limit of 29 ppb. Horwitz Ratio (HorRat) factor was obtained less than 2 for repeatability measurement and percent recovery was 100.58%. The concentration of Cu(II) was found to be 188 ppb in Dermaga Ikan Tuna and 117 ppb in Dermaga 2. The concentration of Cu(II) in the seawater around Benoa Port was higher than the treshold according to Ministry of Environment Regulation No. 51/2004 for Seawater Quality Standard.

FRAKSINASI DAN BIOAVAILABILITAS LOGAM Pb DAN Cr DALAM SEDIMEN DI PELABUHAN BENOA Ni Luh Eka Lusiana Dewi; Emmy Sahara; A. A. I. A Mayun Laksmiwati
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

The fractionation and the bioavailability determination of Pb and Cr in sediment of Benoa Bay have been studied. This study was aimed to determine the metals concentration in their various chemical forms. A 63 µm nylon mesh screen was used for wet and dry sieving the sediment samples. Through fractionation, the bioavailabilities of both metals could be determined. For the total metals determinations, the samples were digested with aqua regia which is the mixture of HCl and HNO3(3:1). Fractionation was done with the application of the four steps sequential extraction technique. All metals measurements were carried out with the use of the technique of Atomic Absorption Spectrophotometry. The total concentrations of Pb in sediments sieved in wet and dry conditions were 18.4852 mg/kg and 23.3974 mg/kg, respectively, whereas the total concentrations of Cr in those of wet and dry conditions were 17.7131 mg/kg and 24.9371 mg/kg, respectively. The fractionations of Pb in sediments sieved in wet and dry conditions showed the same paterns which were as follow: freely, leachable, dan exchangeable (EFLE) fraction < Fe/Mn-oxide fraction < resistant fraction < organic dan sulfide fraction. The fractionation of Cr in wet sieved sediment was as follows: EFLE fraction < resistant fraction < organic and sulfide fraction < Fe/Mn-oxide fraction whereas that of Cr in dry sieved sediment was as follows EFLE< Fe – Mn oxide fraction < resistant fraction < organic and sulfide fraction. The bioavailable and resistant fractions found for Pb in wet sieved sediment were 74.13% and 22.88%, respectively, whereas those of Pb found in dry sieved sediment were 82.84% dan 13.85%, respectively. The bioavailable and resistant fractions found for Cr in wet sieved sediment were 77.59% and 11.23%, respectively, whereas those of Cr in dry sieved sediment were 90.55% and13.21%, respectively.

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BATANG TANAMAN GUMITIR (TAGETES ERECTA) DENGAN AKTIVATOR NaOH Emmy Sahara; Ni Kadek Dahliani; Ida Bagus Putra Manuaba
Jurnal Kimia (Journal of Chemistry) Vol. 11. No.2 Juli 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Dalam penelitian ini dilakukan pembuatan dan karakterisasi arang aktif dari batang tanaman gumitir (Tagetes erecta) menggunakan aktivator NaOH. Penelitian ini bertujuan untuk membuat arang aktif dan menentukan konsentrasi NaOH optimum 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. Hasil penelitian menunjukkan bahwa arang aktif yang diaktivasi dengan natrium hidroksida (NaOH) 2,5% menghasilkan arang aktif dengan karakteristik terbaik dan memenuhi standar baku mutu SNI 06 – 3730 – 1995 tentang arang aktif teknis. Arang aktif yang diperoleh dalam penelitian ini memiliki kadar air sebesar 1,25 ± 0,02%, kadar zat mudah menguap sebesar 12,00 ± 0%, kadar abu total sebesar 5,33 ± 0,41%, kadar karbon sebesar 81,41%, daya serap terhadap metilen biru sebesar 199,97 ± 0,07 mg/g, dan daya serap terhadap I2 sebesar 728,09 ± 2,16 mg/g. Hasil analisis dengan spektrofotometer FTIR menunjukkan bahwa arang aktif tersebut mempunyai gugus fungsi C-H alifatik, C=O, C=C aromatik, dan O-H ikatan hidrogen

SPESIASI DAN BIOAVAILABILITAS LOGAM Cu DAN Zn DALAM SEDIMEN DI PELABUHAN BENOA YANG DIAYAK BASAH DAN KERING Arik Agustina; Emmy Sahara; I G.A. Kunti Sri Panca Dewi
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 speciation and bioavailability of Cu and Zn in sediments of Benoa Bay during which the sediments were sieved in wet and dry conditions. The objective of the study was to determine the concentrations of Cu and Zn in various geochemical forms, therefore the bioavalabilities of the metals could be determined. The determination of the total concentrations of Cu and Zn in the sediments were carried out by the application of extraction with the mixture of HCl and HNO3 (3:1). The speciations of the metals were accomplished with the sequential extraction procedure. The metals concentration measurements were performed by Atomic Absorption Spectroscopy technique with the calibration curve method. It was found that the total Cu concentrations in sediment sieved in wet and dry conditions were 178.4144 mg/kg and 179.9797 mg/kg, respectively. The speciation results for Cu in sediment sieved in wet and dry conditions were as follow: freely, leachable and exchangeable (EFLE) fraction 0.79 and 0.49%, Fe / Mn-oxide fraction 67.75% and 58.71%; organic and sulfide fractions 24.34% and 34.71%, while resistant fraction 2.89% and 2.82%. Therefore, the bioavalable and resistant fractions of Cu in wet sieved sediment were 92,88 % and 2.89%, respectively, while those of dried sieved were 93,92 % and 2,82%, respectively. The total Zn concentrations in sediment sieved in wet and dry conditions were 195.4015 mg/kg and 196.9482 mg/kg, respectively. The speciation results for Zn in sediment sieved in wet and dry conditions were as follow: EFLE fraction 18.83% and 17.40%, Fe / Mn-oxide fraction 35.86 and 37.65%; organic and sulfide fractions 17.16% and 31.09%, while resistant fraction 5.76% and 4.09%. Therefore, the bioavalable and resistant fractions of Cu in wet sieved sediment were 71.85% and 5.70%, respectively, while those of dried sieved were 86.14% and 4.09%, 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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