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INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
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Articles 20 Documents
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Search results for , issue "SEMINAR NASIONAL KIMIA 2018" : 20 Documents clear
PERBANDINGAN METODE DESTRUKSI BASAH SISTEM TERBUKA DAN TERTUTUP TERHADAP ANALISIS LOGAM TIMBAL (Pb) DALAM SAMPEL TANAH PADA DAERAH BEKAS PERTAMBANGAN DI SAMARINDA DENGAN AAS Suci Andriyaningrum; Bohari Yusuf; Rahmat Gunawan
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

Study of the comparison wet destruction methods open and closed systems to the analysis of lead metal (Pb) in soil samples at the former mining site in Samarinda with AAS has been done. The resultant destruction solution was obtained from wet destruction with open and closed systems with temperature and time variation using concentrated HNO3 acid solvent and aqua regia acid. The resultant destruction solution obtained was dissolved with aquadest and tested by Atomic Absorption Spectrophotometer at wavelength 283.3 nm. The result obtained in this research is the concentration of lead metal (Pb) that contained in the soil samples at the former mining site in Samarinda are 13.565 mg/kg with recovery percentage of 100.53% in wet destruction closed methods with the use of concentrated HNO3 acid at temperature 250°C during 2 hours and 15.723 mg/kg with recovery percentage of 100.48% in wet destruction closed methods with the use of concentrated HNO3 acid at temperature 250°C during 3 hours. Keywords: Wet destruction methods, lead metal (Pb), concentrated HNO3, aqua regia, Atomic Absorption Spectrophotometer.
ANALISA KADAR LOGAM TIMBAL (Pb) PADA BEBERAPA MADU ALAM Firman Arif Saputra; Bohari Yusuf; Syafrizal Syafrizal
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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Telah dilakukan analisa kadar logam timbal (Pb) pada beberapa madu alam, Madu yaitu madu yang berasal dari Kebun Raya Samarinda (KRUS), madu Sulawesi dan madu yang berasal dari budidaya di Fakultas Matematika dan Ilmu Pengetahuan Universitas Mulawarman. Preparasi sampel didestruksi basah dengan wet digester menggunakan kombinasi HNO3(P) - H2O2(P). Hasil penelitian menunjukan adanya kadar logam berat timbal (Pb) pada madu alam ; untuk sampel A (Kebun Raya Universitas Mulawarman Samarinda) sebesar 0.0767 mg/kg, untuk sampel B (Fakultas Matematika dan Ilmu Pengetahuan Universitas Mulawarman Samarinda) sebesar 1.0867 mg/kg dan sampel C (madu alam Sulawesi) sebesar 1.6667 mg/kg. Dengan demikian, madu alam tersebut masih dalam ambang batas diperbolehkannya kandungan Pb dalam makanan yang ditetapkan oleh BSN. 2009. SNI 7387: 2009 yakni sebesar 2,0 mg/kg. Dari hasil proses analisis Pb pada madu tidak memerlukan penambahan standar adisi pada metode pendekteksiannya. Kata kunci : Lebah tanpa sengat (Trigona Spp), Timbal (Pb), Madu, Destruksi Basah.
ISOLASI DAN PENENTUAN KONDISI KERJA OPTIMUM AMILASE DARI TALAS BOGOR (Colocasia esculenta (L.) shoot) Rezky Estrada; Rudi Kartika; Winni Astuti
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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Isolation and determination of optimum amylase work condition has been conducted from Bogor taro (Colocasia esculenta (L.) shoot). The aim of this research is to understand the optimum work condition and specific activity of amylase from Bogor taro. Amylase was isolated using homogenization techniques and sentrifugation. The raw extract of enzyme that contain amylase produced by Bogor taro then used to determine the total protein concentration and tested its activity in pH condition, temperature and maximum substrate concentration in various ways. The determination of total protein concentration was done with Bradford method, while the optimum work condition and specifik activity of amylase was done with dinitrosalycylic acid (DNS) method. The result of this reseach show the total protein concentration in Bogor taro is 7,88 μg/mL. Optimum work condition in Bogor taro is on acidity level (pH) 6, 600C temperature and 6 mg/mL substrate concentration. Specific activity from Bogor taro is 9573,68 U/mL. Keywords: amylase, taro tuber Bogor (Colocasia esculenta (L.) shoot), specific activity of amylase.
EFEKTIVITAS BENZOIL PEROKSIDA SEBAGAI INISIATOR PADA REAKSI ANTARA ASPAL DENGAN POLIMER YANG MEMANFAATKAN LIMBAH PLASTIK POLIPROPILENA DAN KARET BAN Denny Akbar Tanjung; Dewi Nur Anggraeni
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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Research on the effectiveness of benzoyl peroxide (BPO) as a reaction initiator between asphalt and polymer utilizing polypropylene plastic waste and tire rubber has been conducted, which aims to determine the effectiveness of BPO initiators in improving the mechanical properties (tensile strength) on asphalt mixtures, polypropylene, and rubber tire, and to identify group changes that occur after the use of BPO reviewed from the FTIR spectroscopy analysis. This research was conducted by mixing polypropylene which has been dissolved by xylene with tire rubber into glass and heated at 160 oC while stirring until homogeneous, which then added with asphalt, followed by the addition of BPO inisiator varied, which is then molded and flattened with a hot compressor machine at a temperature of 165 oC. The result was a tensile strength test which obtained maximum tensile strength on variation of 5 phr BPO addition for 60% asphalt mixture, 35% polypropylene, and 5% tire rubber which is 66,38 MPa. The results of characterization by FTIR spectroscopy show the presence of crosslinking between hydroxyl groups of asphalt with polypropylene through a radical reaction initiated by BPO. Keywords: Benzoyl Peroxide, Tire Rubber, Asphalt, Polypropylene, Tensile Strength, FTIR Spectoscopy.
SINTESIS ETIL ASETAT DARI HASIL FERMENTASI KULIT SINGKONG (Manihot Esculenta L) DENGAN ASAM ASETAT MENGGUNAKAN KATALIS ASAM Tri Eva Lidiawati; Chairul Saleh; Alimuddin Alimuddin
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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A study on the synthesis of ethyl acetate from fermented cassava peel (Manihot esculenta L) with acetic acid using acid catalyst has been done. Determination of the ratio of ethanol content with the addition of yeast bread and yeast tape, also to know the rendement of ethanol and ethyl acetate contained in cassava skin. Cassava leaf flour is hydrolyzed by using concentrated hydrochloric acid (HCl) then tested by reducing sugar content by nelson somogyi method and analyzed by using UV-Vis spectrophotometry. The hydrolysis result is divided into two parts and added yeast tape and bread yeast is also added nutrient NPK each and fermented for 5 days. The fermentation results were distilled off and analyzed using Chromatography Gas (GC). The obtained ethanol is reacted with acetic acid and sulfuric acid catalyst in the esterification reaction to obtain ethyl acetate. The esterification results were analyzed by IR spectroscopy. Ethanol obtained from Chromatography Gas (GC) analysis of 13% and esterification results from IR spectroscopic analysis showed the presence of ester (ethyl acetate) formed. Keywords: Cassava Leather, Fermentation, Esterification, Ethyl Acetate.
ISOLASI DAN PENENTUAN KONDISI KERJA OPTIMUM AMILASE PADA UMBUT KELAPA (Coccos nucifera L.) Lila Karina Nuryanti; Winni Astuti; Rudi Kartika
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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Amylase is an enzyme that can catalyze stach hydrlysis into its simplier molecule as glucose. Coconut’s buds (Coccos nucifera L.) have high enough of carbohydrate content which amylase could have existed. The research are to determine protein concentration, optimum catalyst function and specified activity of amylase in coconut’s buds (Coccos nucifera L.). Coconut’s buds (Coccos nucifera L.) are isolated by extraction method using phospate buffer solution 0,1 M pH 7. The determination of protein concentration are used Bradford method. The determination of optimum catalyst function are used dinitrosalicylate acid (DNS), optimum catalyst fuction which are determined include of optimum pH, optimum temperature and optimum substrate concentration. The determination of specified activity of amylase are tested in optimum condition. The result of research are obtained the protein content are 2,933 mg/mL. The specified activity which are obtained from coconut’s buds (Coccos nucifera L.) are 80,376 U/mg in pH 6, temperature 50 ºC and substrate concentration 6,5 mg/mL Keywords : amylase, coconut’s buds, dinitrosalicylate acid (DNS) and specified activity.
MODIFIKASI SPENT BLEACHING EARTH DENGAN WO3 MELALUI PROSES PILARISASI UNTUK UJI FOTODEGRADASI ZAT WARNA METHYLENE BLUE Rinda Anisyah Putri; Noor Hindryawati; RR. Dirgarini Julia N. S.
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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The Research on modification of Spent Bleaching Earth (SBE) with WO3 has been studied through the process of pillarization for dye photodegradation test of Methylene Blue. This research start from the process of sample preparation, SBE activation using H2SO4, addition of rarasaponin on SBE, pillarization of WO3 on SBE and photodegradation test. DSBE-WO3 was characterized using X-Ray Flouresence (XRF) and X-Ray Diffraction (XRD). XRF analysis of DSBE-WO3 showed an increase in SiO2 composition after activation. The XRD pattern of DSBE-WO3 showed the presence of a WO3 peak. The optimum conditions for photodegradation of methylene blue with DSBE-WO3 were obtained when the 0,02 g of DSBE-WO3, 60 minutes contact time and 100 ppm concentration of methylene blue were used with percent degradation of 95,18%. Keywords: Spent Bleaching Earth, pillarization, WO3, Methylene Blue, photodegradation.
UJI FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL RIMPANG TEMU HITAM (Curcuma aeruginosa Roxb.) Devi Amaliah
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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Uji fitokimia dan aktivitas antioksidan rimpang temu hitam (Curcuma aeruginosa Roxb.) telah dilakukan. Rimpang temu hitam dimaserasi dengan metanol dan dipekatkan menggunakan rotary evaporator. Selanjutnya dilakukan skrining fitokimia dengan metode Kromatografi Lapis Tipis (KLT) serta uji aktivitas antioksidan dengan metode 1,1-Diphenyl-2-Picrylhydrazyl (DPPH). Pada uji aktivitas antioksidan, sampel diinkubasi selama 30 menit pada suhu 37 °C, kemudian absorbansinya diukur pada λ=517 nm menggunakan spektrofotometer. Berdasarkan hasil skrining fitokimia, diketahui bahwa ekstrak metanol mengandung senyawa alkaloid, flavonoid, polifenol dan terpenoid/steroid. Lebih lanjut lagi, uji aktivitas antioksidan menunjukkan nilai Inhibitory Concentration (IC50) untuk ekstrak metanol rimpang temu hitam (Curcuma aeruginosa Roxb.) adalah 283,411 µg/mL. Dari hasil uji aktivitas antioksidan dapat disimpulkan bahwa ekstrak metanol memiliki potensi aktif sebagai antioksidan. Kata Kunci: Curcuma aeruginosa Roxb, Skrining fitokimia, KLT, antioksidan, DPPH.
POTENSI ANTIJAMUR EKSTRAK METANOL AKAR MANGROVE Rhizopora apiculata TERHADAP JAMUR Candida albicans Usman Sain; Rizal Hariyadi
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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Mangroves generations used by the community as a medicinal ingredient. One of a breed of mangrove from plants is mangrove rhizophora apiculata. Mangrove rhizopora apiculata is a plant contained on the edge of the beach. The study is done to know compound of a metabolite secondary there are in plants mangrove rhizopora apiculata and the potential mangrove rhizopora apiculata to inhibition of the growth of fungi. Mangrove rhizopora apiculata ordinary be used as processed food .The kind of research this is research experiment. To test compound of a metabolite secondary used test qualitative. While , to inhibition of the growth of fungi used method of scratch using fungi candida albicans and aspergillus niger. Based on this research note Rhizophora apiculata mangrove leaves with methanol extract containing flavonoids, steroids, tannin, saponin. Methanol extract of roots of mangrove Rhizophora apiculata in a concentration of 1250 ppm, 2000 ppm, 5000 ppm and 10000 ppm have not been able to inhibit the growth of the fungus Candida albicans. Keywords: Root Mangrove Rhizophora apiculata, Secondary Metabolites Compounds, antifungals.
PEMBUATAN DAN PEMANFAATAN SILIKA DARI PASIR PANTAI SEBAGAI BAHAN PEMUCAT UNTUK MENURUNKAN KADAR ASAM LEMAK BEBAS PADA CPO (CRUDE PALM OIL) Nirwana Nirwana; Alimuddin Alimuddin; Erwin Erwin
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2018
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A study on the manufacture and utilization of silica from coastal sand as a pale ingredient to lower free fatty acid levels has been conducted. The present invention includes sample preparation, sodium silicate (Na2SiO3), silica gel formation, silica gelation and Crude Palm Oil (CPO) test result of bleaching. The results showed that the silica of coastal sand was potential as a crude palm oil (CPO) ingredient with the ability to decrease the free fatty acid and color brightness, on the addition of 1 gram of silica obtained result of free fatty acid content analysis is 24,35 % with decreased color brightness of 0,27% and on the addition of 2 gram of silica obtained result of free fatty acid content analysis is 42,49 % with decreased color brightness of 2,8%. Keywords: Sand Beach Sebatik Island, Silica, Bleaching, Crude Palm Oil (CPO), Free Fatty Acid Levels.

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