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Arsenic accumulation and speciation in plants from different habitats
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
2012 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 27, no 3, 615-622 p.Article in journal (Refereed) Published
Abstract [en]

Understanding As accumulation in plants is necessary in order to alleviate problems with As in the environment and to improve sustainable As phytotechnologies. To find suitable candidates for phytoremediation purposes and to investigate specific accumulation patterns due to growth habitat and plant groups, As accumulation in 124 plant species collected from different habitats and speciation in 6 of these plant species, was determined. The data show that submerged plants have a higher accumulation than emergent and terrestrial plants. The As concentration in terrestrial and emergent plants were correlated with the [As](soil), while the accumulation factor correlated negatively with [As](soil). Gymnosperms had a high [As](shoot):[As](root) ratio. The inorganic As species, arsenate and arsenite were found in plants from all habitats and methylarsonic acid (MMA) in all but one plant species. Arsenate predominated in submerged plants. The results suggest that the habitat and the [As](soil) have a strong influence on the As accumulation in plants and that submerged plants and/or gymnosperms might be suitable for phytoremediation of As.

Place, publisher, year, edition, pages
2012. Vol. 27, no 3, 615-622 p.
National Category
URN: urn:nbn:se:su:diva-76961DOI: 10.1016/j.apgeochem.2011.12.009ISI: 000300403400008OAI: diva2:534228


Available from: 2012-06-15 Created: 2012-05-28 Last updated: 2013-02-19Bibliographically approved
In thesis
1. Arsenic accumulation in plants for food and phytoremediation: Influence by external factors
Open this publication in new window or tab >>Arsenic accumulation in plants for food and phytoremediation: Influence by external factors
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Arsenic (As) appears in the environment as various As species, which may vary in plant uptake and toxicity. Moreover, As exposure may vary between habitat due to availability and speciation, both of which are influenced by redox potential. To decrease As uptake, addition of silicate may be a tool.

The aim of the study was to investigate how the external factors As availability, plant habitats, silicon and oxygen level, influenced the accumulation and speciation of As in plants for food and phytoremediation in a temperate region. The external factors were chosen due to their previously showed influence on As in plants.

The risks with dietary As was investigated by plant As accumulation and speciation in carrot, lettuce and spinach grown in alum shale and glassworks soils, and by the influence of silicon on As accumulation in lettuce in hydroponics. Suitable plants for As phytoremediation was investigated by analysing plants from various habitats, and by the O2 influence on phytofiltration.

The results showed that vegetables accumulated more As in soils with higher As extractability, and the As extractability in the rhizosphere was higher than in bulk soil. Also, the As concentration in lettuce was higher in hydroponics than in soil, but silicon reduced the accumulation of As in lettuce in hydroponics. Also, the more toxic inorganic As were the main As species detected in vegetables, compared with the less toxic organic As. For phytoremediation, the results showed a low As accumulation in emergent and terrestrial plants. Submerged plants had had a higher shoot As concentration. In general, the habitat had a major influence on the As accumulation in plants. The results also showed that the As accumulation properties in Elodea canadensis was reduced at higher O2.

In conclusion, consumption of vegetables cultivated in As polluted soils can result in an elevated intake of inorganic As, and E. canadensis is a promising candidate for As phytofiltration in a temperate region.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2013. 52 p.
Arsenic, accumulation, availability, distribution, habitat, phy-toremediation, rhizosphere, redox potential, speciation
National Category
Research subject
Plant Physiology
urn:nbn:se:su:diva-87798 (URN)978-91-7447-653-8 (ISBN)
Public defence
2013-04-02, föreläsningssalen, Lilla Frescati, Lilla Frescativägen 5, Stockholm, 13:00 (English)

At the time of the doctoral defence the following papers were unpublished and had a status as follows: Paper 2: Manuscript; Paper 4: Manuscript; Paper 5: Manuscript.

Available from: 2013-03-11 Created: 2013-02-19 Last updated: 2013-02-21Bibliographically approved

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Bergqvist, ClaesGreger, Maria
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