A methodological approach for the identification of arsenic bearing phases in polluted soils

Arsenic in the three polluted soils is mainly associated with neoformed amorphous iron (hydr)oxides. A methodological approach is used to characterize arsenic pollution in three soils and to determine arsenic speciation and association with solid phases in three polluted soils. HPLC–ICP–MS was used...

Full description

Saved in:
Bibliographic Details
Published in:Environmental pollution (1987) 2003-01, Vol.126 (1), p.51-64
Main Authors: Matera, V, Le Hécho, I, Laboudigue, A, Thomas, P, Tellier, S, Astruc, M
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Arsenic
Arsenicals - analysis
Bearing phases
Biological and physicochemical properties of pollutants. Interaction in the soil
Chemical Sciences
Chromatography, High Pressure Liquid - methods
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental Monitoring - methods
Exact sciences and technology
Iron
Pollution
Pollution, environment geology
Soil
Soil and sediments pollution
Soil Pollutants - analysis
Speciation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Arsenic in the three polluted soils is mainly associated with neoformed amorphous iron (hydr)oxides. A methodological approach is used to characterize arsenic pollution in three soils and to determine arsenic speciation and association with solid phases in three polluted soils. HPLC–ICP–MS was used for arsenic speciation analysis, SEM-EDS and XRD for physical characterization of arsenic pollution, and sequential chemical extractions to identify arsenic distribution. Arsenic was concentrated in the finest size fractions also enriched in iron and aluminium. Total arsenic concentrations in soils are close to 1%. Arsenic was mainly present as arsenate, representing more than 90% of total arsenic. No crystallised arsenic minerals were detected by XRD analysis. SEM-EDS observations indicated arsenic/iron associations. Modified Tessier's procedure showed that arsenic was mainly extracted from amorphous iron oxide phase. The results of this methodological approach lead to predict the formation of iron arsenates in the case of one of the studied soils while arsenic sorption on iron amorphous (hydr)oxides seemed to be the determinant in the two other soils.
ISSN:0269-7491
1873-6424
DOI:10.1016/S0269-7491(03)00146-5