Arsenic phytoextraction

Wongkongkatep, J., Parkpian, P., Polprasert, C., Supaibulwatana, K., lida, T., and Fukushi, K. 2004. Phytoremediation of arsenic by Pityrogramma calomelanos Do synthetic chelating agents increase or decrease arsenic phytoextraction efficiency Annual Report of Interdisciplinary Research Institute of Environmental Sciences, 22 61-72. 

A number of terrestrial plants are known not only to tolerate but also to hyperaccumu-late metals, and thus they might be useful for phytoextraction. Recently, a brake fern Pteris vitata) was identified that not only can tolerate up to 1500 mgkg arsenic in soil, but has also a bioconcentration factor of about 190 that leads to a content of 2.3% (dry weight), mainly as As " and As (Zhang et al. 2002). 

Lim et al. (2004) optimized the time and electric field applied to each Indian mustard Brassica juncea) plant in a remediation experiment performed in 1.2-kg pots of lead- and arsenic-contaminated soil. The electric potential of 30-40V applied 1 h per day were the optimal conditions to reach maximum phytoextraction after 9-day treatment. In this case, the increase of EDTA availability by the electrical current caused a rapid toxicity response of plants that limited the remediation process. 

CHAPTER 12 Solubility and the phytoextraction of arsenic from soils by two... 

Solubility and the Phytoextraction of Arsenic from Soils by Two Different Fern Species... 

The rate of absorption within plants depends on the species, redox potential, and Fe presence. The P. vittata has a higher potential for in situ cleaning-up of arsenic-contaminated soils and suggests that As phytoextraction is a constitutive property in P. vittata. 

Artus, N.N., 2006. Arsenic and cadmium phytoextraction potential of crambe compared with Indian mustard. J. Plant Nutt. 29, 667-679. 

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