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Organic Matter in Coal Seam-vi of the Barapukuria Coal Field in Bangladesh

S. Tahsin
Department of Petroleum and Mining Engineering, Jessore University of Science and Technology, Jessore-7408, Bangladesh

H. M. Z. Hossain*
Atmosphere and Ocean Research Institute, the University of Tokyo, Chiba 277-8564, Japan; Department of Petroleum and Mining Engineering, Jessore University of Science and Technology, Jessore-7408, Bangladesh

M. M. Hossain
Barapukuria Coal Mining Company Limited (BCMCL), Dinajpur, Bangladesh

Abstract/ Executive Summary:

Organic matter sources and depositional environments of Permian Gondwana coals in the coal seam-VI, Barapukuria coal field, northwest ern Bangladesh have been investigated using CHNS elemental analysis. A total of 8 coal samples were collected from the coal seam-VI within depth range between 118 and 509 m. Total organic carbon (TOC), hydrogen, nitrogen and sulfur contents range from 48 to 75 (aver age 61 wt.%), 3.89 to 5.80 (average 4.59 wt.%), 2.87 to 3.87 (average 3.28 wt.%), and 0.19 to 0.37 wt.% (average 0.30 wt.%), respectively. C/N ratio range between 14 and 21 (average 19), and a positive correlation between TOC and TN (r = 0.51) suggested that organic matter in the coals was derived largely from terrestrial plants. However, C/S ratio values (up to 376) and scatter distribution between TOC and TS indicates the coal seam-VI was deposited in fresh water dominated inland lake environments.

Keywords: Organic matter; Depositional environment; Gondwana coal; Barapukuria coal field; Bangladesh

Location: Department of Petroleum and Mining Engineering, Jessore University of Science and Technology, Jessore-7408, Bangladesh

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Coal

Objectives:

To observe the Organic matter in coal seam-VI of the Barapukuria coal field in Bangladesh

Methodology:

Eight fresh coal samples (ca. 100 g) were collected using a hand cutter from the coal seam-VI, Barapukuria coal field, Bangladesh. Depths of the coal sample points range between 454 and 494 m from the surface. The coals are dark black to shiny black and brownish in color and brittle structure containing some laminations and chalcopyrite impressions. The coal samples are dried, and subsequent ly powdered using an iron mortar and pestle. Total organic carbon (TOC), total hydrogen (TH), total nitrogen (TN), and total sulfur (TS) contents were determined by combustion method about 1800°C in a CHNS elemental analyzer (EA 1108). Approximately 5 mg of powdered coal sample was placed in a thin Ag film cup, and 1M-HCL added several times and dried at 110°C for 30 minutes. The dried coal sample was then wrapped in a thin tin film for combustion. TOC, TH, TN and TS data were calibrated against a BBOT standard (2, 5-Bis-(5-tert-butyl-benzoxazol-2-yl)thiophen), and standard regression line method was employed for quantitative analysis. All analyses were carried out on a dry weight basis at Bangladesh Council of Scientific and Industrial Research (BCSIR) laboratory.

Source of Information: Bangladesh J. Sci. Ind. Res. 51(3), 221-230, 2016

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Eight Gondwana coal samples of Permian age were collected from coal seam-VI of the Barapukuria coal field, north western Bangladesh have been investigated using CHNS elemental analysis to identify sources and depositional environments of organic matter. TOC, TN, TH and TS contents of the coal samples were ranging from 48 to 75 wt.% (average 61wt.%), 3 to 4 wt.% (average 3 wt.%), 4 to 6 wt.% (average 5 wt.%) and 0.19 to 0.37 wt.% (average 0.30 wt.%), respectively. The C/N and C/S ratio values range from 14 to 21 (average 19) and 156 to 376 (average 218), respectively suggesting land plant derived organic matter subsequently deposited in entirely terrestrial environments.

Knowledge Management: Journal