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Accumulation and speciation of arsenic in vegetables cultivated in soils with various As availability
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. (Greger group)
Department of Earth Sciences, Uppsala University. (Hydrology)
Department of Inorganic and Physical Chemistry, Swedish University of Agricultural Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. (Greger group)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The toxicity of arsenic (As) in the environment is controlled by its concentration, availability and speciation. The aims of the study were to evaluate the accumulation and speciation of As in three vegetables (carrot, lettuce, spinach) cultivated in both contaminated and natural soils with various As concentrations and to estimate the concomitant health risks associated with the consumption of the vegetables. Arsenic concentration and speciation in plant tissues and soils was analysed by HPLC, AAS and X-ray absorption near-edge structure (XANES) spectroscopy. To estimate the plants influence in the rhizosphere, organic acids in lettuce root exudates were analysed by ion chromatography. The results showed that the As accumulation was higher in plants cultivated in soil with higher As extractability. Arsenate predominated in the soils, rhizosphere and root exudates of lettuce. Succinic acid was the major organic acid in lettuce root exudates. Arsenite was the predominating As species in the shoots of healthy looking plants. In plants showing signs of phytotoxicity, arsenate was predominating. Ingestion of the tested vegetables may result in an intake of elevated levels of As.

Keyword [en]
Arsenic, accumulation, speciation, availability, rhizosphere
National Category
Botany
Research subject
Plant Physiology
Identifiers
URN: urn:nbn:se:su:diva-87789OAI: oai:DiVA.org:su-87789DiVA: diva2:606366
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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