Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil

The mobility of arsenic (As) and antimony (Sb) in soils is controlled by several processes (adsorption/desorption, (co)precipitation/dissolution and oxidation/reduction), depending on various environmental factors that are often convoluted and site-dependent. This study investigated: (i) the content...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Asmaa Rouwane, Malgorzata Grybos, Marion Rabiet, Gilles Guibaud
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	arsenic antimony mobilization wetland soil geochemical background sequential extraction procedure Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/7a6773df9e334ea7b58460b23f9aebb0
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:7a6773df9e334ea7b58460b23f9aebb0
record_format	dspace
spelling	oai:doaj.org-article:7a6773df9e334ea7b58460b23f9aebb02021-11-25T17:42:46ZPotentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil10.3390/geosciences111104442076-3263https://doaj.org/article/7a6773df9e334ea7b58460b23f9aebb02021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3263/11/11/444https://doaj.org/toc/2076-3263The mobility of arsenic (As) and antimony (Sb) in soils is controlled by several processes (adsorption/desorption, (co)precipitation/dissolution and oxidation/reduction), depending on various environmental factors that are often convoluted and site-dependent. This study investigated: (i) the content and solid-phase distribution of geogenic As and Sb in a vertical soil profile (0–130 cm) of an agricultural wetland subject into alternating oxic and anoxic conditions induced by periodic waterlogging and (ii) identifies the stability of the As and Sb host phases during soil reduction (laboratory incubation) using a sequential extraction procedure (fractions: loosely and strongly adsorbed, carbonates, easily reducible, reducible, oxidable and residual). The field results showed that, in the deeper, permanently water-saturated soil layers (<60 cm), the amounts of As and Sb were relatively low (As: 8 ± 2 µg·g<sup>−1</sup> and Sb: 0.9 ± 0.2 µg·g<sup>−1</sup>) and related to the Fe content. In the periodically flooded upper soil layers (0–40 cm), the amounts of As and Sb were higher compared to the deeper layers (As: 36 ± 3 µg·g<sup>−1</sup> and Sb: 1.14 ± 0.05 µg·g<sup>−1</sup>). The observed enrichment towards the surface was attributed to the higher content of organic matter (for Sb) and metalloids distribution among the easily reducible fraction (for As). The anoxic laboratory incubation of periodically waterlogged soil showed that, during soil reduction, As is largely mobilized from the easily reducible fraction and undergoes partial readsorption. Unlike As, Sb displayed a higher affinity for more stable soil components (e.g., reducible and residual fractions), which highlights its limited mobility in periodically waterlogged soil compared to As. The potentially mobilizable As and Sb estimated as the sum of the acetate-exchangeable, P-exchangeable, easily reducible and H<sub>2</sub>O<sub>2</sub>-organic fractions represent up to 83%, 69% and 53% of the total As and up to 53%, 44% and 54% of the total Sb at 0–20-cm, 40–60-cm and 90–110-cm depths, respectively. Thus, unpolluted soils may act as sources of As and Sb to aquatic environments and therefore have negative consequence on the downstream water quality.Asmaa RouwaneMalgorzata GrybosMarion RabietGilles GuibaudMDPI AGarticlearsenicantimonymobilizationwetland soilgeochemical backgroundsequential extraction procedureGeologyQE1-996.5ENGeosciences, Vol 11, Iss 444, p 444 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	arsenic antimony mobilization wetland soil geochemical background sequential extraction procedure Geology QE1-996.5
spellingShingle	arsenic antimony mobilization wetland soil geochemical background sequential extraction procedure Geology QE1-996.5 Asmaa Rouwane Malgorzata Grybos Marion Rabiet Gilles Guibaud Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
description	The mobility of arsenic (As) and antimony (Sb) in soils is controlled by several processes (adsorption/desorption, (co)precipitation/dissolution and oxidation/reduction), depending on various environmental factors that are often convoluted and site-dependent. This study investigated: (i) the content and solid-phase distribution of geogenic As and Sb in a vertical soil profile (0–130 cm) of an agricultural wetland subject into alternating oxic and anoxic conditions induced by periodic waterlogging and (ii) identifies the stability of the As and Sb host phases during soil reduction (laboratory incubation) using a sequential extraction procedure (fractions: loosely and strongly adsorbed, carbonates, easily reducible, reducible, oxidable and residual). The field results showed that, in the deeper, permanently water-saturated soil layers (<60 cm), the amounts of As and Sb were relatively low (As: 8 ± 2 µg·g<sup>−1</sup> and Sb: 0.9 ± 0.2 µg·g<sup>−1</sup>) and related to the Fe content. In the periodically flooded upper soil layers (0–40 cm), the amounts of As and Sb were higher compared to the deeper layers (As: 36 ± 3 µg·g<sup>−1</sup> and Sb: 1.14 ± 0.05 µg·g<sup>−1</sup>). The observed enrichment towards the surface was attributed to the higher content of organic matter (for Sb) and metalloids distribution among the easily reducible fraction (for As). The anoxic laboratory incubation of periodically waterlogged soil showed that, during soil reduction, As is largely mobilized from the easily reducible fraction and undergoes partial readsorption. Unlike As, Sb displayed a higher affinity for more stable soil components (e.g., reducible and residual fractions), which highlights its limited mobility in periodically waterlogged soil compared to As. The potentially mobilizable As and Sb estimated as the sum of the acetate-exchangeable, P-exchangeable, easily reducible and H<sub>2</sub>O<sub>2</sub>-organic fractions represent up to 83%, 69% and 53% of the total As and up to 53%, 44% and 54% of the total Sb at 0–20-cm, 40–60-cm and 90–110-cm depths, respectively. Thus, unpolluted soils may act as sources of As and Sb to aquatic environments and therefore have negative consequence on the downstream water quality.
format	article
author	Asmaa Rouwane Malgorzata Grybos Marion Rabiet Gilles Guibaud
author_facet	Asmaa Rouwane Malgorzata Grybos Marion Rabiet Gilles Guibaud
author_sort	Asmaa Rouwane
title	Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
title_short	Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
title_full	Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
title_fullStr	Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
title_full_unstemmed	Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil
title_sort	potentially mobilizable geogenic as and sb in an agricultural wetland soil
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7a6773df9e334ea7b58460b23f9aebb0
work_keys_str_mv	AT asmaarouwane potentiallymobilizablegeogenicasandsbinanagriculturalwetlandsoil AT malgorzatagrybos potentiallymobilizablegeogenicasandsbinanagriculturalwetlandsoil AT marionrabiet potentiallymobilizablegeogenicasandsbinanagriculturalwetlandsoil AT gillesguibaud potentiallymobilizablegeogenicasandsbinanagriculturalwetlandsoil
_version_	1718412049956995072

Potentially Mobilizable Geogenic As and Sb in an Agricultural Wetland Soil

Ejemplares similares