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Oxygen influences on arsenic behaviour in sediment-water-plant system of Elodea canadensis
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. (Greger group)
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. (Greger group)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Phytofiltration can be used to remove arsenic (As) from water using the submerged macrophyte Elodea canadensis. To understand the effects of aeration on this system, we investigated the influence of different O2 levels on the As concentration and speciation in sediment, water and E. canadensis,and the efficiency of phytofiltration of As by this plant. The water in pots with As, E. canadensis and/or sediment were aerated with N2, air or left unmodified to create low, high and medium O2 levels, respectively. Analyses of As concentration and species were performed with HPLC-AAS. The results showed that the As accumulation properties by E. canadensis decreased at high O2. Medium O2 had the lowest As release from sediment to water and among the highest plant As accumulation. Arsenate predominated in the sediment-water-plant system, but arsenite increased with decreasing O2. To create conditions favouring the binding of As in sediment and accumulation from water by E. canadensis, the O2 concentration should be medium.

Keyword [en]
Accumulation, arsenic, O2, phytofiltration, speciation
National Category
Botany
Research subject
Plant Physiology
Identifiers
URN: urn:nbn:se:su:diva-87788OAI: oai:DiVA.org:su-87788DiVA: diva2:606351
Available from: 2013-02-19 Created: 2013-02-19 Last updated: 2013-02-19
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.
Keyword
Arsenic, accumulation, availability, distribution, habitat, phy-toremediation, rhizosphere, redox potential, speciation
National Category
Botany
Research subject
Plant Physiology
Identifiers
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)
Opponent
Supervisors
Note

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: 2016-10-26Bibliographically approved

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