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Speciation of adsorbed arsenic(V) on red mud using a sequential extraction procedure

Published online by Cambridge University Press:  05 July 2018

D. A. Rubinos ,
M. Arias ,
F. Díaz-Fierros  and
M. T. Barral
D. A. Rubinos*
Affiliation:
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
M. Arias
Affiliation:
Área de Edafoloxía e Química Agrícola, Facultade de Ciencias de Ourense, Universidade de Vigo, 32004 Ourense, Spain
F. Díaz-Fierros
Affiliation:
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
M. T. Barral
Affiliation:
Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
*
*E-mail: edrubi@usc.es
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Abstract

The distribution of sorbed arsenic(V) among different geochemical fractions for arsenic(V)-loaded red mud, an oxide-rich residue from bauxite refining that has been proposed as an adsorbent for arsenic, was studied as a function of sorbed arsenic(V) concentration using a sequential extraction procedure. The release of previously sorbed arsenic(V) was also studied as a function of pH and arsenic(V) concentration. Most sorbed arsenic(V) (0.39–7.86 mmol kg–1) was associated with amorphous and crystalline Al and Fe oxides (24.1–43.8% and 24.7–59.0% of total sorbed arsenic, respectively). Exchangeable arsenic was the smallest fraction (0.4–5.2% of total sorbed arsenic). The distribution of sorbed arsenic(V) was related to the arsenic surface coverage. For arsenic surface coverages >∼30% the percentage of arsenic(V) associated with the amorphous Al oxide fraction increased and that associated with the crystalline oxide fraction decreased. The arsenic(V) exchangeable fraction increased from 1.4 to 756 μmol kg–1 as surface coverage increased from 388 to 7855 μmol kg–1. The release of sorbed arsenic(V) from red mud was greater at alkaline pH values (maximum release of ∼33% of previously sorbed arsenic at pH = 12), but for high arsenic(V) initial concentration (0.2 mM arsenic) considerable amounts of arsenic (6.5% of previously sorbed arsenic) were released at pH 4, in accordance with the dissolution of amorphous Al oxides in the red mud. The results obtained suggest a greater mobility of sorbed arsenic(V) as its surface concentration approaches saturation.

Keywords

red mudarsenicsorptionspeciationsequential extraction
Type
Research Article
Information
Mineralogical Magazine , Volume 69 , Issue 5 , October 2005 , pp. 591 - 600
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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