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P-Enhanced Phytoextraction of Arsenic from contaminated Soil using Sunflower

P-Enhanced Phytoextraction of Arsenic from contaminated Soil using Sunflower June 2003
Author(s): Gulz, P.A. (Swiss Federal Inst. of Technology ETH, Schlieren, Switzerland); S.K. Gupta (Swiss Federal Research Station for Agroecology and Agriculture FAL, Zurich, Switzerland); R. Schulin Proceedings of the 7th International Conference on the Biogeochemistry of Trace Elements (7th ICOBTE), 15-19 June 2003, Uppsala, Sweden. Book of Abstracts. Vol I-II, p 148-149, 2003
Mine: Waste Type: soil Contaminant(s): arsenic Technology Type: phytoextraction
Keywords: sunflower, arsenate, phosphate, phytoextraction
Abstract: Arsenic (As) exists in different oxidation states. The pentavalent arsenate (AsO4) is the most stable and predominant species in well aerated soils, hence arsenic pollution in agricultural soils is mostly a problem of arsenate. Arsenate and phosphate (PO4) are chemically very similar and so compete for binding sites in the soil. Consequently, phosphate addition to soils may increase arsenate in the soil solution by displacement of arsenate from specific sorption sites through competitive anion-exchange. This in turn increases the availability of As to be taken up by plant roots. In addition, phosphate fertilization may directly enhance As accumulation of plants by stimulating the phosphate uptake mechanisms, which cannot discriminate well between phosphate and arsenate. While there has been substantial research into arsenic uptake by plants in the past, little attention has been paid to the potential of using high biomass crop plants for arsenic phytoextraction. Previous studies have shown that sunflower (Helianthus annuus L.) may be a candidate plant for this purpose. This paper describes a study to investigate sunflower extraction of arsenic from the soil with phosphate added as a mobilizing agent.
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