Interrelationship of TOC, As, Fe, Mn, Al and Si in shallow alluvial aquifers in Chapai-Nawabganj, Northwestern Bangladesh: implication for potential source of organic carbon

Reza, A. H. M. Selim and Jean, Jiin-Shuh and Lee, Ming-Kuo and Luo, Shang-De and Bundschuh, Jochen and Li, Hong-Chun and Yang, Huai-Jen and Liu, Chia-Chuan (2011) Interrelationship of TOC, As, Fe, Mn, Al and Si in shallow alluvial aquifers in Chapai-Nawabganj, Northwestern Bangladesh: implication for potential source of organic carbon. Environmental Earth Sciences, 63 (5). pp. 955-967. ISSN 1866-6280

Abstract

Two boreholes and ten piezometers in the Ganges flood plain were drilled and installed for collecting As-rich sediments and groundwater. Groundwater samples from the Ganges flood plain were collected for the analysis of cations (Ca2+, Mg2+, K+, Na+), anions (Cl-, NO3 -, SO4 2-), total organic carbon (TOC), and trace elements (As, Mn, Fe, Sr, Se, Ni, Co, Cu, Mo, Sb, Pb). X-ray powder diffraction was performed to characterize the major mineral contents of aquifer sediments and X-ray fluorescence (XRF) to analyze the major chemical composition of alluvial sediments. Results of XRF analysis clearly show that fine-grained sediments contain higher amounts of trace element because of their high surface area for adsorption. Relative fluorescence index (15-38 QSU) of humic substance in groundwater was measured using spectrofluorometer, the results revealed that groundwater in the Ganges flood plain contains less organic matter (OM). Arsenic concentration in water ranges from 2.8 to 170 μg/L (mean 50 μg/L) in the Ganges flood plain. Arsenic content in sediments ranges from 2.1 to 14 mg/kg (mean 4.58 mg/kg) in the flood plains. TOC ranges from 0.49 to 3.53 g/kg (mean 1.64 g/kg) in the Ganges flood plain. Arsenic is positively correlated with TOC (R2 = 0. 55) in sediments of this plain. Humic substances were extracted from the sediments from the Ganges flood plain. Fourier transform infrared analysis of the sediments revealed that the plain contains less humic substances. The source of organic carbon was assigned from δ13C values obtained using elemental analysis-isotope ratio mass spectrometry (EA-IRMS); the values (-10 to -29. 44‰) strongly support the hypothesis that the OM of the Ganges flood plain is of terrestrial origin.

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Item Type:	Article (Commonwealth Reporting Category C)
Refereed:	Yes
Item Status:	Live Archive
Additional Information:	© 2010 Springer-Verlag. Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School:	Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited:	20 Sep 2014 02:51
Last Modified:	31 Jan 2017 00:10
Uncontrolled Keywords:	arsenic, organic matter, Bangladesh, Ganges flood plain, spectrofluorometer
Fields of Research :	05 Environmental Sciences > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment 04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry 05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Socio-Economic Objective:	D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960608 Rural Water Evaluation (incl. Water Quality) D Environment > 96 Environment > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified
Identification Number or DOI:	10.1007/s12665-010-0764-3
URI:	http://eprints.usq.edu.au/id/eprint/25814

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