KUSUMA, HENDRA SISWANTO (2015) BIOMARKA KETON DAN ASAM BATUBARA MIOSEN DARI PIT INUL SANGATTA, KALIMANTAN TIMUR. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Batubara dari Pit Inul Sangatta, Kalimantan Timur terbentuk
dari zaman Miosen termasuk dalam klasifikasi batubara muda.
Karakter geokimia organik (biomarka) memberikan informasi
kondisi batubara untuk pemanfaatan lebih lanjut. Batubara
diekstraksi dengan pelarut diklorometana:metanol (93:7). Ekstrak
bitumen yang diperoleh difraksinasi dengan kromatografi kolom
untuk mendapatkan fraksi netral dan asam. Fraksi netral
difraksinasi kembali dengan kromatografi lapis tipis (KLT) untuk
memperoleh senyawa keton. Komponen fraksi keton diidentifikasi
sebagai n-nonadekan-2-on dan 15-sikloheksil-pentadeka-2-on
yang diperkirakan hasil oksidasi dan siklisasi senyawa n-alkana
oleh mikroba. Selain itu diidentifikasi juga keberadaan senyawa
keton turunan amirin berupa olean-13(18)-en-3-on, α-amiron, dan
β-amiron yang banyak ditemukan pada tumbuhan darat tingkat
tinggi. Fraksi asam dianalisa dengan kromatografi gas-spektrometri
massa (KG-SM) sebagai turunan metil ester. Biomarka asam
diidentifikasi berupa karboksilat rantai panjang (C18-C30), yang
didominasi oleh rantai karbon beratom genap terhadap ganjil yang
menggambarkan sumber bahan organik berasal dari tanaman
tingkat tinggi. Diidentifikasi juga metil monoester bercabang
dengan rantai karbon menengah (C12-C18) dan asam aromatik
menandakan adanya kontribusi dari bakteri. Asam 3,4-secofriedelan-
3-oat yang teridentifikasi pada sampel menunjukkan
kondisi lingkungan pengendapan oksidatif. Batubara Miosen
dari Pit Inul Sangatta, Kalimantan Timur diperkirakan terbentuk dari tumbuhan darat dan keterlibatan bakteri selama proses
diagenesis dengan kondisi lingkungan pengendapan cenderung
bersifat oksidatif.
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Lignite from Pit Inul Sangatta, East Kalimantan was formed
during Miocene. Organic geochemical character (biomarker) can
give information about coal descriptions for further utilization.
Coal was extracted with dichloromethane: methanol (93:7) as a
solvent. Bitumen extracts was fractionated by column
chromatography to obtain neutral and acid fractions. Neutral
fraction was further fractionated by thin layer chromatography
(TLC) to obtain ketones. Components of the ketone fraction
identified as n-nonadecan-2-one and 15-cyclohexyl-pentadeca-2-
one expected from oxidation and cyclization of n-alkane by
microbes. In addition, olean-13(18)-en-3-one and fridelan-3-one
are present that inform the coal derive from terrestrial higher plants
in oxic condition. Acid fraction was analyzed by gas
chromatography-mass spectrometry (GC-MS) as methyl ester
derivatives. Acid biomarkers identified in the form of normal
methyl ester and branched methyl ester. Normal methyl esters (C16-
C30) are dominated by even over odd carbon atom number that
describes source of organic matters from higher plants. Methyl
monoester with intermediate carbon chain (C12-C18) and aromatic
carboxylic indicates contribution of bacteria. The precence of metil
3,4-seco-fridelan-3-oic in studied sample shows the coal derive
from terrestrial higher plants in oxidative depositional
environment. Miocene coal from Pit Inul Sangatta, East
Kalimantan was derived from terrestrial higher plants and involvement of bacteria during diagenesis in oxidative depositional environment.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKi 662.662 4 Kus b |
| Uncontrolled Keywords: | batubara Miosen, biomarka, fraksi asam, fraksi keton, kromatografi |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Mathematics and Science > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Anis Wulandari |
| Date Deposited: | 05 Jan 2017 04:20 |
| Last Modified: | 24 Aug 2018 03:27 |
| URI: | http://repository.its.ac.id/id/eprint/1321 |
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