PHYTO-REMEDIATION AND CHEMICAL METHOD OF CdCONTAMINATED WATER-CULTURE ANDCALCAREOUS SOIL

Document Type : Research articles.

Authors

Soils, Water and Environment Res. Inst., Agric. Res. Center, Giza, Egypt

Abstract

The objectives of the current investigation aimed to a) assess the
ability of sorghum plants (Sorghum Bicolor L.) to accumulate
cadmium in its tissues (phyto-remediation) and b) compare the
efficiency of phyto-remediation and chemical method to extract Cd from
either Cd-contaminated water-culture or sandy clay loam calcareous
soil. To achieve these objectives, three experiments were conducted, i.e.,
a) nutri-culture experiment (water-culture), b) green pot experiment using
a calcareous soil and c) sequential extraction experiment (laboratory
incubation). Cd was applied at the rates of 0, 1 and 2 mg L-1 in the waterculture experiment; and 0, 100 and 200 mg kg-1 in the green pot
experiment.
The obtained results indicated that dry matter yield of sorghum plants
decreased in both the water-culture and pot experiments vs increasing its
concentration and uptake in plant tissues with increasing the applied Cd
rate. Sequential extraction showed that removal amounts of Cd by
ammonium bicarbonate-DTPA (AB-DTPA) as well as ammonium
acetate-EDTA progressively increased with increasing Cd rate from 100 up < br />to 200 mg kg-1 soil. Percent removal of Cd by 1st extraction was greater than
the 2nd one using either extractant. AB-DTPA extracted about 18 % which
nearly double of contaminating Cd by AA-EDTA (about 7 %)

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