Nugrahini, Ageng Mukti (2021) Analisis Biomarka Hidrokarbon Alifatik dan Aromatik Batubara Formasi Ngrayong, Jatirogo, Tuban. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Telah dilakukan analisis biomarka hidrokarbon alifatik dan aromatik batubara JT-1B dari Formasi Ngrayong di Cekungan Jawa Timur bagian Utara. Analisis dilakukan dengan metoda ekstraksi soklet, fraksinasi dan identifikasi struktur biomarka menggunakan Kromatografi Gas-Spektrometri Massa (KG-SM). Analisis biomarka bertujuan untuk mendapatkan informasi yang berhubungan dengan sumber masukan bahan organik, tingkat kematangan, lingkungan pengendapan purba dan potensi sumber bahan organik batubara. Hasil identifikasi menunjukkan keberadaan senyawa 17β(H)-22,29,30-trisnorhopana, 17β(H),21β(H)-homohopana, dan nilai rasio C31αβ22S/(22S+22R) sebesar 0,27 yang mengindikasikan bahwa sampel memiliki maturitas yang relatif rendah. Teridentifikasinya senyawa C31 homohopana menunjukkan lingkungan pengendapan oksik. Kelimpahan kelompok aromatik pentasiklik triterpenoid, rasio CPI (1,91), OEP (2,07) dan n-C31/n-C19 (18,86) yang tinggi serta rasio Paq (0,22) dan wax index (0,31) yang rendah menunjukkan kontribusi besar sumber bahan organik berasal dari tumbuhan terestrial tingkat tinggi (vitrinit) Angiosperma. Keberadaan biomarka yang teridentifikasi menunjukkan batubara JT-1B Formasi Ngrayong merupakan kerogen tipe III yang memiliki kecenderungan menghasilkan gas (gas prone).
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Biomarker analysis of aliphatic and aromatic hydrocarbons JT-1B coal has been carried out from the Ngrayong Formation in the North East Java Basin. The analysis was carried out by the method of soxhlet extraction, fractionation and identification of biomarker structures using gas chromatography – mass spectrometry (GC-MS). The biomarker analysis aims to obtain information related to the source of organic matter input, maturity level, paleoenviromental, and potential sources of coal organic matter. The identification results indicate the presence of 17β(H)-22,29,30-trisnorhopane, 17β(H),21β(H)-homohopane, and the C31αβ 22S/(22S+22R) ratio value is 0,27 suggest that sample has a relatively low maturity. The identification of the compound C31 homohopane indicated an oxic depositional environment. The abundance of pentacyclic triterpenoid aromatic groups, high CPI (1.91), OEP (2.07) and n-C31/n-C19 (18.86) ratios, as well as low Paq (0.22 ) and wax index (0.31) ratio indicate the major contribution of the source of organic matter derived from terrestrial higher plants (vitrinite) of Angiosperms. The presence of identified biomarkers indicates that the JT-1B coal of the Ngrayong Formation is a type III kerogen that has a tendency to produce gas (gas prone).
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Batubara, Hidrokarbon Alifatik, Hidrokarbon Aromatik, Biomarka, Formasi Ngrayong. Coal, Aliphatic Hydrocarbons, Aromatic Hydrocarbons, Biomarker, Ngrayong Formation. |
| Subjects: | Q Science > QD Chemistry Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas Q Science > QD Chemistry > QD63 Extraction |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Ageng Mukti Nugrahini |
| Date Deposited: | 29 Aug 2021 17:54 |
| Last Modified: | 23 Apr 2024 05:41 |
| URI: | http://repository.its.ac.id/id/eprint/90496 |
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