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Biogeochemical phosphorus cycling in groundwater ecosystems - Insights from South and Southeast Asian floodplain and delta aquifers.
Sci Total Environ 2018; 644:1357-1370ST

Abstract

The biogeochemical cycling of phosphorus (P) in South and Southeast Asian floodplain and delta aquifers has received insufficient attention in research studies, even though dissolved orthophosphate (PO43-) in this region is closely linked with the widespread contamination of groundwater with toxic arsenic (As). The overarching aim of this study was to characterize the enrichment of P in anoxic groundwater and to provide insight into the biogeochemical mechanisms underlying its mobilization, subsurface transport, and microbial cycling. Detailed groundwater analyses and in situ experiments were conducted that focused on three representative field sites located in the Red River Delta (RRD) of Vietnam and the Bengal Delta Plain (BDP) in West Bengal, India. The results showed that the total concentrations of dissolved P (TDP) ranged from 0.03 to 1.50 mg L-1 in groundwater, with PO43- being the dominant P species. The highest concentrations occurred in anoxic sandy Holocene aquifers where PO43- was released into groundwater through the microbial degradation of organic carbon and the concomitant reductive dissolution of Fe(III)-(hydr)oxides. The mobilization of PO43- may still constitute an active process within shallow Holocene sediments. Furthermore, a sudden supply of organic carbon may rapidly decrease the redox potential, which causes an increase in TDP concentrations in groundwater, as demonstrated by a field experiment. Considering the subsurface transport of PO43-, Pleistocene aquifer sediments represented effective sinks; however, the enduring contact between oxic Pleistocene sediments and anoxic groundwater also changed the sediments PO43--sorption capacity over time. A stable isotope analysis of PO43--bound oxygen indicated the influences of intracellular microbial cycling as well as a specific PO43- source with a distinct isotopically heavy signal. Consequently, porous aquifers in Asian floodplain and delta regions proved to be ideal natural laboratories to study the biogeochemical cycling of P and its behavior in groundwater environments.

Authors+Show Affiliations

Geoecology, Eberhard Karls University Tübingen, 72070 Tübingen, Germany. Electronic address: harald.neidhardt@uni-tuebingen.de.Isotope Geochemistry, Eberhard Karls University Tübingen, 72074 Tübingen, Germany.Geoecology, Eberhard Karls University Tübingen, 72070 Tübingen, Germany.Institute of Applied Geosciences, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.Institute of Applied Geosciences, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.Research Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Vietnam National University, Hanoi, Viet Nam.Research Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Vietnam National University, Hanoi, Viet Nam.Research Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Vietnam National University, Hanoi, Viet Nam.Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India.Groundwater Research Group, Texas A&M University, 3115 TAMU, College Station, TX, United States.Department of Chemistry, University of Kalyani, Kalyani, 741235 Nadia, West Bengal, India.Geoecology, Eberhard Karls University Tübingen, 72070 Tübingen, Germany.Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30743848

Citation

Neidhardt, Harald, et al. "Biogeochemical Phosphorus Cycling in Groundwater Ecosystems - Insights From South and Southeast Asian Floodplain and Delta Aquifers." The Science of the Total Environment, vol. 644, 2018, pp. 1357-1370.
Neidhardt H, Schoeckle D, Schleinitz A, et al. Biogeochemical phosphorus cycling in groundwater ecosystems - Insights from South and Southeast Asian floodplain and delta aquifers. Sci Total Environ. 2018;644:1357-1370.
Neidhardt, H., Schoeckle, D., Schleinitz, A., Eiche, E., Berner, Z., Tram, P. T. K., ... Berg, M. (2018). Biogeochemical phosphorus cycling in groundwater ecosystems - Insights from South and Southeast Asian floodplain and delta aquifers. The Science of the Total Environment, 644, pp. 1357-1370. doi:10.1016/j.scitotenv.2018.07.056.
Neidhardt H, et al. Biogeochemical Phosphorus Cycling in Groundwater Ecosystems - Insights From South and Southeast Asian Floodplain and Delta Aquifers. Sci Total Environ. 2018 Dec 10;644:1357-1370. PubMed PMID: 30743848.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Biogeochemical phosphorus cycling in groundwater ecosystems - Insights from South and Southeast Asian floodplain and delta aquifers. AU - Neidhardt,Harald, AU - Schoeckle,Daniel, AU - Schleinitz,Anna, AU - Eiche,Elisabeth, AU - Berner,Zsolt, AU - Tram,Pham T K, AU - Lan,Vi M, AU - Viet,Pham H, AU - Biswas,Ashis, AU - Majumder,Santanu, AU - Chatterjee,Debashis, AU - Oelmann,Yvonne, AU - Berg,Michael, Y1 - 2018/07/23/ PY - 2018/03/27/received PY - 2018/07/04/revised PY - 2018/07/04/accepted PY - 2019/2/13/entrez PY - 2019/2/13/pubmed PY - 2019/2/23/medline KW - Aquatic phosphorus cycling KW - Asian floodplain and delta regions KW - Groundwater KW - Phosphate KW - Reducing aquifers KW - Stable oxygen isotopic signature in phosphate SP - 1357 EP - 1370 JF - The Science of the total environment JO - Sci. Total Environ. VL - 644 N2 - The biogeochemical cycling of phosphorus (P) in South and Southeast Asian floodplain and delta aquifers has received insufficient attention in research studies, even though dissolved orthophosphate (PO43-) in this region is closely linked with the widespread contamination of groundwater with toxic arsenic (As). The overarching aim of this study was to characterize the enrichment of P in anoxic groundwater and to provide insight into the biogeochemical mechanisms underlying its mobilization, subsurface transport, and microbial cycling. Detailed groundwater analyses and in situ experiments were conducted that focused on three representative field sites located in the Red River Delta (RRD) of Vietnam and the Bengal Delta Plain (BDP) in West Bengal, India. The results showed that the total concentrations of dissolved P (TDP) ranged from 0.03 to 1.50 mg L-1 in groundwater, with PO43- being the dominant P species. The highest concentrations occurred in anoxic sandy Holocene aquifers where PO43- was released into groundwater through the microbial degradation of organic carbon and the concomitant reductive dissolution of Fe(III)-(hydr)oxides. The mobilization of PO43- may still constitute an active process within shallow Holocene sediments. Furthermore, a sudden supply of organic carbon may rapidly decrease the redox potential, which causes an increase in TDP concentrations in groundwater, as demonstrated by a field experiment. Considering the subsurface transport of PO43-, Pleistocene aquifer sediments represented effective sinks; however, the enduring contact between oxic Pleistocene sediments and anoxic groundwater also changed the sediments PO43--sorption capacity over time. A stable isotope analysis of PO43--bound oxygen indicated the influences of intracellular microbial cycling as well as a specific PO43- source with a distinct isotopically heavy signal. Consequently, porous aquifers in Asian floodplain and delta regions proved to be ideal natural laboratories to study the biogeochemical cycling of P and its behavior in groundwater environments. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/30743848/Biogeochemical_phosphorus_cycling_in_groundwater_ecosystems___Insights_from_South_and_Southeast_Asian_floodplain_and_delta_aquifers_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(18)32539-7 DB - PRIME DP - Unbound Medicine ER -