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Influence of sorption processes by Fe oxides and algal uptake on Arsenic and Phosphate cycle in an acidic estuary (Tinto river, Spain)

Influence of sorption processes by Fe oxides and algal uptake on Arsenic and Phosphate cycle in an acidic estuary (Tinto river, Spain)
Influence of sorption processes by Fe oxides and algal uptake on Arsenic and Phosphate cycle in an acidic estuary (Tinto river, Spain)
Inorganic arsenic and phosphate distributions have been studied in the acidic mixing zone of the Tinto river in November 1996, June 1997, and April 1998. This mixing zone receives high inputs of As, PO3?4 and Fe in relation with acid mine drainage and run-off from phosphogypsum waste. In the early stage of mixing the dissolution of detritic Fe phases (pyrite and oxides) releases Fe and As to water. This process is counterbalanced by removal due to precipitation of Fe-oxides and Fe-organic complexes and algae fixation. In autumn, the amount of algae is negligible and a release of As, Fe and PO3?4 to the dissolved phase was observed. As a consequence, high As and PO3?4 concentrations are registered in the water (up to 43 nM for As and 330 M for PO3?4). In spring, the removal dominates in relation with high algae productivity. As a result As and PO3?4 are depleted in the dissolved phase in spring compared to autumn and high concentrations of As (up to 1530 g g?1 and 700 g g?1 in June and in April, respectively) were observed in the suspended particulate matter. In autumn dissolved As is correlated with Fe whilst in spring As behaves in a similar way as PO3?4.
arsenic, phosphate, iron, biogeochemistry, acidic estuary, algae
0043-1354
3222-3230
Elbaz-Poulichet, F.
89e521c6-779a-4e5e-b169-554f402d879e
Dupuy, C.
190aec77-9caf-4d5f-b749-90d596de713d
Cruzado, A.
c1e91329-d53b-4302-861f-53b247f6ea1f
Velasquez, Z.
d22cc244-c3b8-41cb-9a9a-39db92b6c75e
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Braungardt, C.B.
e235ed81-73f5-4178-a4d2-577036c9cdab
Elbaz-Poulichet, F.
89e521c6-779a-4e5e-b169-554f402d879e
Dupuy, C.
190aec77-9caf-4d5f-b749-90d596de713d
Cruzado, A.
c1e91329-d53b-4302-861f-53b247f6ea1f
Velasquez, Z.
d22cc244-c3b8-41cb-9a9a-39db92b6c75e
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Braungardt, C.B.
e235ed81-73f5-4178-a4d2-577036c9cdab

Elbaz-Poulichet, F., Dupuy, C., Cruzado, A., Velasquez, Z., Achterberg, E.P. and Braungardt, C.B. (2000) Influence of sorption processes by Fe oxides and algal uptake on Arsenic and Phosphate cycle in an acidic estuary (Tinto river, Spain). Water Research, 34, 3222-3230. (doi:10.1016/S0043-1354(00)00073-7).

Record type: Article

Abstract

Inorganic arsenic and phosphate distributions have been studied in the acidic mixing zone of the Tinto river in November 1996, June 1997, and April 1998. This mixing zone receives high inputs of As, PO3?4 and Fe in relation with acid mine drainage and run-off from phosphogypsum waste. In the early stage of mixing the dissolution of detritic Fe phases (pyrite and oxides) releases Fe and As to water. This process is counterbalanced by removal due to precipitation of Fe-oxides and Fe-organic complexes and algae fixation. In autumn, the amount of algae is negligible and a release of As, Fe and PO3?4 to the dissolved phase was observed. As a consequence, high As and PO3?4 concentrations are registered in the water (up to 43 nM for As and 330 M for PO3?4). In spring, the removal dominates in relation with high algae productivity. As a result As and PO3?4 are depleted in the dissolved phase in spring compared to autumn and high concentrations of As (up to 1530 g g?1 and 700 g g?1 in June and in April, respectively) were observed in the suspended particulate matter. In autumn dissolved As is correlated with Fe whilst in spring As behaves in a similar way as PO3?4.

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Published date: 2000
Keywords: arsenic, phosphate, iron, biogeochemistry, acidic estuary, algae

Identifiers

Local EPrints ID: 12563
URI: https://eprints.soton.ac.uk/id/eprint/12563
ISSN: 0043-1354
PURE UUID: a7f4d6b1-da16-42a2-8304-d11115001498

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Date deposited: 26 Nov 2004
Last modified: 17 Jul 2017 17:02

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Contributors

Author: F. Elbaz-Poulichet
Author: C. Dupuy
Author: A. Cruzado
Author: Z. Velasquez
Author: E.P. Achterberg
Author: C.B. Braungardt

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