Role of organic matter and humic substances in the binding and mobility of arsenic in a Gangetic aquifer

Kar, Sandeep and Maity, Jyoti Prakash and Jean, Jiin-Shuh and Liu, Chia-Chuan and Nath, Bibhash and Lee, Yao-Chang and Bundschuh, Jochen and Chen, Chien-Yen and Li, Zhaohui (2011) Role of organic matter and humic substances in the binding and mobility of arsenic in a Gangetic aquifer. Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering, 46 (11). pp. 1231-1238. ISSN 1093-4529

Abstract

Arsenic (As) enrichment in groundwater has led to extensive research, particularly on the factors responsible for its release into groundwater. In the Gangetic plain, organic matter driven microbial reduction of Fe-oxyhydroxides is considered as the most plausible mechanism of As release into groundwater. However, the role of organic matter in the aqueous environment is not well known and particularly that of organometallic complex. In this study, we have characterized bulk sediment and groundwater samples, collected from Barasat, West Bengal, India, to understand the effect of organic matter in the binding and mobility of As in the subsurface environment. The results showed a moderate correlation (R2 = 0.49, p < 0.05) between dissolved organic carbon (DOC) and As in groundwater, suggesting that DOC has a role in releasing As into groundwater. The relative fluorescent intensity (RFI) of the dissolved humic substances in groundwater showed a maximum value of 65 QSU (mean: 47 ± 8 QSU). FT-IR spectra of the extracted humic acid fractions of the sediment showed COO-, C = O, OH, and C = C (aromatic ring) functional groups, which may act as a chelating agents with the metal(loid)s. FT-IR spectra of the HA-As complex exhibited specific peaks at 1242 and 832 cm−1 in the fingerprint region. This is similar to the extracted humic acid fractions of the Gangetic sediment, suggesting binding of As with humic substances.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 17 Sep 2014 05:03
Last Modified: 31 Jan 2017 00:57
Uncontrolled Keywords: arsenic, biogeochemistry, organic matter Ganges aquifer, India
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment
04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry
11 Medical and Health Sciences > 1117 Public Health and Health Services > 111705 Environmental and Occupational Health and Safety
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Socio-Economic Objective: D Environment > 96 Environment > 9605 Ecosystem Assessment and Management > 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments
D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960608 Rural Water Evaluation (incl. Water Quality)
Identification Number or DOI: 10.1080/10934529.2011.598796
URI: http://eprints.usq.edu.au/id/eprint/25818

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