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PREPARASI MANGAN OKSIDA HASIL PERTUKARAN KATION Mg 2+ DENGAN K-BIRNESSITE YANG DISINTESIS MENGGUNAKAN REDUKTOR MALTOSA Anna Ridha Utami; Amir Awaluddin; Pepi Helza Yanti
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Todorokite is a naturally occurring manganese oxides having tunnelled structure (3x3) with pore size of 6,9 Å. This type of manganese oxide could be synthesized from birnessite precursor by reflux method. The exchangeable cation K + in interlayer of birnessite can be replaced with Mg 2+ ions to produce a Mg-birnessite, which then could be converted into todorokite through calcination. The products were then characterized by X-ray Powder Diffraction (XRD) to determine their phases, crystallinity and purity. Data from Absorption Atomic Spectroscopy (AAS) indicated that the 70,63% replacement of K + with Mg 2+ was achieved within contact time of 14 h. Analysis for todorokite have been done with different contact time of 18, 20 and 24 hours. The results of XRD showed that the main phases were birnessite with todorokite as minor product that was obtained at reaction time of 20 hours.

PREPARASI MANGAN OKSIDA HASIL PERTUKARAN KATION Mg 2+ DENGAN K-BIRNESSITE YANG DISINTESIS MENGGUNAKAN REDUKTOR GLUKOSA Afra Juwita; Amir Awaluddin; Akmal Muchtar
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Todorokite is a family of tunneled manganese oxide with 3x3 tunnel framework. It could beprepared through a precursor Mg-birnessite by reflux method. In this study, K-birnessite was prepared by ceramic routes using glucose as reducing agent. K-birnessite was then ion-exchanged with Mg 2+ to form Mg-birnessite. The typical reaction conditions for ion-exchanged K + with Mg 2+ were as follows: contact times of 10, 12, 14, 16 and 18 hours with 16 hours for the optimum replacement ion K + with ion Mg 2+ . The total replacement of ion K + by ion Mg 2+ was 94,32%. Data from the X-ray diffraction pattern showed the formation of todorokite at 2Ө = 9,02o with d-spacing 9,79Å, but the peak for K-birnessite also appeared at an angle 2Ө = 12,57o with d-spacing 7,03Å. Thermal analysis of Mg-birnessite was observed by TG-DTA curve that showed the weight loss of Mg-birnessite about 20%. DTA curve also showed endotermic peak at 900oC, which indicated the transformation phase from layered to tunneled structure.

PRODUKSI DAN UJI AKTIVITAS SELULASE DARI ISOLAT BAKTERI SELULOLITIK SUNGAI INDRAGIRI Kiki Apriani; Yuli Haryani; Ganis Fia Kartika
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Cellulolytic bacteria has been isolated from water and sediment sample of Indragiri river waters. Cellulase was produced by cellulolytic bacterial isolates in 1% Carboxy Methyl Cellulose (CMC) liquid medium at 37°C, 150 rpm for 24 h. The specific activity of cellulase was determined by Nelson-Somogy’s method (cellulase enzyme activity) and Lowry’s method (protein concentration). 914-5 sedimen isolates showed the highest activity of the enzyme 12,246.10 -4 ± 0,5885.10 -4 U/mL from 17 other isolates that was significantly different at (P≤0,05) compared with the other isolate.

PENGOLAHAN AIR GAMBUT MENGGUNAKAN KOAGULAN CAIR DARI LEMPUNG ALAM CENGAR Reza Syahroni; Muhdarina '; Amilia Linggawati
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Cengar clay is used as feedstock for the production of liquid coagulant. Liquid coagulant is used for improve peat water quality. Liquid coagulant was obtained by calcining clay at temperature 700 °C for 3 hours and leaching with 0.2 mol H 2 SO 4 . Variation of leaching conditions were selected at temperatures 30, 60, and 100 °C at 1, 2, and 3 hours. Then, liquid coagulant was used in peat water treatment processes with some parameters such as odor, color, pH, turbidity, TSS (Total Suspended Solid), TDS (Total Dissolved Solid), and dissolved organic acids. The results of peat water parameters after treatment were compared to PP No.82 of 2001 on Water Quality and Water Pollution Control and PERMENKES 416/ Health Minister/PER/IV/1990 about Drinking Water Quality. The results showed that almost all of liquid coagulants were capable to reduce of odor, turbidity, and TDS in peat water. However, one liquid coagulant type of K 100-2 can reduce peat water quality to be odorless, pH of 8,05, turbidity of 4 NTU, TDS of 278 mg/L, and TSS of 7 mg/L.

PENGGUNAAN KOMPOSIT KARET ALAM-ARANG AKTIF-PASIR COR UNTUK MENGURANGI KANDUNGAN NITRAT DALAM LARUTANNYA Dyah Ayu Anggraini; Tengku Ariful Amri; Amilia Linggawati
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Composite is a material made up of two parts, binder (matrix) and filler. This material is widely used in human activities as water purification media. Composite materials that used in this study consist of natural rubber as a matrix with filled activated charcoal and sand cast. The composition of the composite is 0% sand : 100% charcoal (KA), 50% sand : 50% charcoal (KAP), 100% sand : 0% charcoal (KP). These composites are used to reduce the nitrate content in the nitrate solution which have initial concentration of 5 and 10 ppm. Nitrate contents before and after passing the composite were analyzed using Brusin sulfate method. The results showed that the composite rail is more effective at reducing nitrate solution which has initial concentration of 10 ppm at 30o C. In these conditions the composite KA can reduce the high nitrate content to 73.38%, while the KAP and KP can only reduce nitrate content of 69.75% and 53.88% respectively.

ISOLASI DAN UJI TOKSISITAS SENYAWA ALKALOID DARI KULIT BATANG TUMBUHAN Polyalthia rumphii (B) Merr. (ANNONACEAE) Hakim, Diski Rahman; Teruna, Hilwan Yuda; ', Yuharmen
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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An alkaloid has been isolated from the stem bark of Polyalthia rumphii and the toxicity activity was determined using the Brine Shrimp Lethality Test method againts larvae of Artemia salina Leach. The sample was extracted by maceration method using n-hexane and methanol respectively. The dried sample produced 4.19 g of n-hexane extract and 80.56 g of methanol extract. The methanol extract was extracted using acid-base method produced 0.04 g of crude alkaloids which then was subjected to column chromatography produced three fractions. Since the amount of fraction 1 & 3 was insufficient for further purification, only fraction 2 was purified using Sephadex LH-20 to give a compound coded as DK1. The structure of DK1 was determined using 1H-NMR spectroscopy and indicated that DK1 had aromatic rings and a methoxy group.The toxicity assay showed that the extract of methanol and the fraction 2 were toxic with LC50 154.98 and 243.91 ppm, respectively .

ISOLASI METABOLIT SEKUNDER DAN UJI TOKSISITAS EKSTRAK METANOL DAGING BUAH TANAMAN Cerbera odollam Gaertn. (APOCYNACEAE) Nelma Yeni; Hilwan Yuda Teruna; Jasril '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Cerbera odollam Gaertn is a plant found in Indonesia which is used as traditional medicine. Isolation and toxicity assay on fruit flesh of this plant has been done. The methanol macerating method was applied to isolate the secondary metabolites from part of this plant. The separation was carried out by vacuum liquid chromatography (VLC), gel chromatography and KLT preparative. Characterization of the fractions was established using UV-Vis and FTIR spectroscopy. Toxicity assay was conducted by Brine Shrimp Lethality Test (BSLT) method. The LC50 of 7th to 11th fractions of the methanol extract were 107,86 ; 5,19; 136,42 ; 41,33 and 720,60 ppm, respectively. The 5th and 6th fractions were not toxic, the 11th fraction was toxic whereas other fractions were very toxic and potential to be used as an anticancer.

POTENSI LIMBAH KULIT PISANG KEPOK (Musa paradisiaca) SEBAGAI BAHAN BAKU PEMBUATAN ASAM ASETAT MENGGUNAKAN BERBAGAI MACAM STARTER Ilham '; Itnawita '; Andi Dahliaty
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Kepok banana (Musa paradisiaca) peel waste contain sugar that can be changed to acetic acid using Effective Microorganism (EM-4), kombucha (KO), cassava yeast (RT) and instant yeast (RI) (commercial starter). The Commercial starter contains variety of bacteria and yeasts with different content of microorganism that will influence the amount of ethanol produced. The aim of this study to determine the potential of kepok banana peel waste used as the main material in synthesis of acetic acid using commercial starter. Based on the fermentation results using the four starter, cassava yeast has a good ability to be fermented. The acetic acid formation was obtained under condition which substrate and starter amount are 80% w/v and 5 grams respectively and fermentation time 4 day. Based on these conditions it was found that the amount of organic acid total determined by titrimetric method is 4.712±0.066% and acetic acid formed which was determined by Ion Chromatography method is 0.7507± 0.0538%.

APLIKASI KOAGULAN CAIR HASIL EKSTRAKSI 0,4 MOL H2SO 4 UNTUK PENGOLAHAN AIR GAMBUT Catrain Susanty; Muhdarina '; Akmal Mukhtar
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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Clay is an abundant natural product that has been used in various fields, one of them as a coagulant in water treatment. Cengar clay contains aluminium and iron that can be extracted to be liquid coagulant. The liquid coagulant was prepared through extraction of 500o C calcined Cengar clay by 0,4 mol of sulfuric acid at various temperatures (30,60, and 100o C) and extraction times (1, 2, and 3 hours). These coagulants were applied to coagulation process of peat water. Several parameters of peat water that were analyzed are turbidity, total dissolve solid (TDS), and total suspended solid (TSS). The turbidity result was compared to PERMENKES RI No. 416/MENKES/PER/IX/1990 “About Requirement and Water Quality Control”, whereas TDS and TSS were compared to Government Regulation No. 82 of 2001 “About Water Quality Treatment and Water Pollution Control” class I (raw drinking water). The result showed that liquid coagulants can fix all of peat water parameters that were analyzed. The optimum coagulant was K 60-3, made through extraction at 60o C for 3 hours, with removal percentage of turbidity was 82,69%; TSS 94,06%, and TDS 84,75%.

KARAKTERISASI LEMPUNG CENGAR AKTIVASI KOH KALSINASI PADA 300 o C Laili, Rahmatul; ', Nurhayati; ', Muhdarina
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
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This research studied about the characteristics ofÂ Cengarâ€™s clay activated with KOH. The clay used was from the village of Lubuk Cengar Jambi Regency Kuantan Singingi. This clay was activated with KOH by impregnation method with variated weights of KOH/Clay i.e 5%, 10%, 15%, 20%, and 25% and the calcination temperature of 300o C. The activated clays were characterized by determining among other types of clay minerals by XRD, Si/Al ratio by gravimetry method,Â cation exchange capacity (CEC) by Mehlich method, surface area by blue methylen adsorption, and the site of acid and base clay with alchalimetry and acidimetry method.Â The results of XRD showed that mineral kaolinite is lost and replaced by new compounds, namely potassium alumina silicate at KOH concentration of 20% and 25%. The highest Si/Al ratio was at concentration 5% (12.13%) and the lowest at 20% (2,52%). Subsequent observations showed that the highest cation exchange capacity (CEC) was at 5% (349.72 meq/100g) and the lowest was at 10% (91.07 meq/100g). The highest surface area was at 25% (33.273 m2/g) and lowest was at 5% (25,838 m2/g). Acidity and alkalinity in activated clay increase higher than those clays of without activation. The highest acidity was at 10% (1,7550 mmol/g), while the highest alkalinity was at 5% (1,0600 mmol/g).

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