Biotechnological Aspects of Soil Decontamination - Biotechnologies and Biomimetics for Civil Engineering - page 388

Fig. 17.4 Schematic
diagram showing mechanism
of phytostabilization

Table 17.5 Some of the plants with potential for rhizofilteration of various metals

Metals Plant species References

As, Cd, Cr, Ni,
Pb, Zn

Eichnornia crassipes
Populus sp., Thlaspi sp.

Zhu et al. ( 1999 ), Mangabeira et al.
( 2004 ), Salt et al. ( 1995a , b )

Fe, Cu, Cr Lemna minor, Azolla pinnata Jain et al. ( 1989 )

Cr Hydrocotyle umballata Yong-pisanphop et al. ( 2005 )

Cr Bacopa monnieri Mangabeira et al. ( 2004 ),

Pb, Cu, U, Sr,
Cs, Co Zn

Helianthus annus Dushenkov et al. ( 1995 )

Cr Spirodela polyrhiza Appenroth et al. ( 2000 )

Pb, Ni, Cd, Zn,
Cd, Cr, Cu

Brassica juncea Raskin et al. ( 1997 )

Pb Hemidesmus indicus Sekhar et al. ( 2004 )

17.4.6.3 Phytovolatilization

This involves use of naturally occurring or genetically modified plants that are
capable of absorbing elemental forms of metal contaminants of subgroups II, V,
and VI of the periodic table, such as As, Hg, and Se from the soil, and biologically
converting them to gaseous species in the plant and releasing them into the