KARAKTERISTIK GEOKIMIA ORGANIK FRAKSI KETON BATUBARA TARAKAN, KALIMANTAN UTARA DAN BATUBARA SAWAHLUNTO, SUMATERA BARAT

ULA, AMIROTUL (2015) KARAKTERISTIK GEOKIMIA ORGANIK FRAKSI KETON BATUBARA TARAKAN, KALIMANTAN UTARA DAN BATUBARA SAWAHLUNTO, SUMATERA BARAT. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Batubara Tarakan, Kalimantan Utara dan batubara Sawahlunto, Sumatera Barat dianalisis untuk menentukan karakter geokimia organiknya. Batubara diekstraksi soxhlet dengan diklorometana:metanol (93:7) sebagai pelarut. Hasil ekstrak organik difraksinasi menjadi fraksi alifatik, aromatik, keton dan polar menggunakan kromatografi kolom. Fraksi keton kemudian dianalisis menggunakan Kromatografi Gas-Spektrometri Massa (KG-SM). Hasil analisis fraksi keton batubara Tarakan menunjukkan keberadaan senyawa sikloheksil keton, metilsikloheksil keton, dan keton terpen trisiklik. Senyawa tersebut diasumsikan berasal dari bakteri. Amirenon yang diidentifikasi dalam sampel merupakan hasil oksidasi β-amirin selama tahap diagenesis pada tumbuhan tingkat tinggi Angiospermae. Analisis fraksi keton batubara Sawahlunto menunjukkan keberadaan senyawa iso dan anteiso-alkan-2-on, dan isoprenoid keton. Senyawa ini diasumsikan berasal dari rantai klorofil-α pada bakteri. Senyawa hopanon dan sikloheksil keton menunjukkan asal usul batubara dari bakteri. Peringkat kematangan batubara Sawahlunto lebih rendah daripada batubara Tarakan dikarenakan terdapat senyawa hopanon pada batubara Sawahlunto. Proses kematangan batubara juga dapat terhambat jika komponen yang ada pada batubara berikatan dengan oksigen. ============================================================ Coal from Tarakan, North Kalimantan and coal from Sawahlunto, West Sumatera were analyzed to determine the character of the organic geochemistry. Coals were extracted Soxhlet with a mixture of diclorometane:methanol (93:7) as a solvent. The extracts were fractionated into aliphatic, aromatic, kotones, and polar fraction using column chromatography. Ketone fractions were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). Result of GC-MS analyzed in ketones fraction of Tarakan coal shown presence of cyclohexyl, methyl cyclohexyl ketones, and tricyclic terpane ketones. These compounds were expected formed by bacteria. Amyrenones were identified in the sample as a result of oxidation β-amyrin during diagenesis of Angyospermae higher plants. Analyzed of ketones fraction Sawahlunto coal shown presence of iso and anteisoalkan- 2-one, and isoprenoid ketones. These compound were expected formed by oxidation of α-chlorophil in the bacteria. Hopanoids ketone and cyclohexyl ketones shown coal formed from bacteria. Rank of Sawah Lonto coal lower than Tarakan coal because there are hopanoids ketone in the Sawahlunto coal. Hopanoids ketone can inhibit the process of coal maturation. The process of coal maturation can also inhibited if the compounds in coal bound with oxygen

Item Type: Thesis (Undergraduate)
Additional Information: RSKi 553.2 Ula k
Uncontrolled Keywords: batubara Tarakan, batubara Sawahlunto, biomarka, fraksi keton, Kromatografi Gas-Sprektrometri Massa (KG-SM).
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Mathematics and Science > Chemistry > (S1) Undergraduate Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 05 Jan 2017 08:22
Last Modified: 05 Jan 2017 08:22
URI: http://repository.its.ac.id/id/eprint/1346

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