Oxygen influences on arsenic behaviour in sediment-water-plant system of Elodea canadensis
(English)Manuscript (preprint) (Other academic)
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.
Accumulation, arsenic, O2, phytofiltration, speciation
Research subject Plant Physiology
IdentifiersURN: urn:nbn:se:su:diva-87788OAI: oai:DiVA.org:su-87788DiVA: diva2:606351