Arsenic phytoextraction by pteris vittata l. and frond conversion by solvolysis: An integrated gentle remediation option for restoring ecosystem services in line with the biorefinery and the bioeconomy

MENCH, M.; GALENDE, M.; MARCHAND, L.; KECHIT, F.; CARRIER, M.; LOPPINET-SERANI, A.; CAILLE, N.; ZHAO, F.J.; VANGRONSVELD, J.
One Century of the Discovery of Arsenicosis in Latin America (1914-2014): As 2014 Proceedings of the 5th International Congress on Arsenic in the Environment, 836-838,11-16 de mayo 2014.

Abstract

Since 2004, Pteris vittata L. was cultivated for stripping bioavailable As in a Belgian soil. Fronds were annually harvested in spring and autumn. Soil treatments, i.e. Beringite (B), iron grit (Z) and their combination (BZ), and season generally did not influence frond yield. On the 2006-2013 period, leachate As concentration remained lower in the Z-treated soils than in the Unt and B soils. Frond As concentrations (in mg As kg-1) varied in the 970-2870 range for the contaminated soils. Frond As removal varied from 3894 to 2278 mg As m-2 in the decreasing order: Unt, B > BZ, Z. Shoot As concentration was lower in BZ-, B- and Z-lettuces cultivated after the fern. Fronds were converted with either sub-or supercritical water conditions. At 300°C, major organic compounds were guaiacols. Cyclopentenones prevailed at 400°C and phenol concentrations raised while those of guaiacols and other compounds decreased for both control and As-contaminated fronds.

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