caroliniana for phytoremediation of FA pond because of its higher bioconcentration factor. Phytoremediation of heavy metals from fly ash pond by Azolla caroliniana.Ībundance of naturally growing Azolla caroliniana (water fern) on the surface of metal enriched fly ash (FA) pond reflects its toxitolerant characteristics. The potential of growing Azolla in paddy fields to reduce As transfer from soil and water to rice should be further evaluated. Both strains effluxed more arsenate than arsenite, and the amount of As efflux was proportional to the amount of As accumulation.
filiculoides had a higher proportion of arsenite than A. Arsenate and arsenite were the dominant As species in both Azolla strains, with methylated As species accounting for <5% of the total As. Both strains showed a similar degree of tolerance to internal As. filiculoides was more resistant to external arsenate due to a lower uptake. Azolla caroliniana accumulated two times more As than Azolla filiculoides owing to a higher influx velocity for arsenate. The highest- and lowest-accumulating ferns among the 50 strains were chosen for further investigations. Fifty strains of Azolla showed a large variation in As accumulation. This study investigates As accumulation and tolerance of the aquatic fern Azolla. Zhang, Xin Lin, Ai-Jun Zhao, Fang-Jie Xu, Guo-Zhong Duan, Gui-Lan Zhu, Yong-Guan Arsenic accumulation by the aquatic fern Azolla: comparison of arsenate uptake, speciation and efflux by A.
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