Potential of kenaf (Hibiscus cannabinus L.) and corn (Zea mays L.) for phytoremediation of dredging sludge contaminated by trace metals
2013
Arbaoui, Sarra | Evlard, Aricia | Mhamdi, Mohamed El Wafi | Campanella, Bruno | Paul, Roger | Bettaieb, Taoufik
The potential of kenaf (Hibiscus cannabinusL.) and corn (Zea mays L.) for accumulation of cadmium and zinc was investigated. Plants have been grown in lysimetres containing dredging sludge, a substratum naturally rich in trace metals. Biomass production was determined. Sludge and water percolating from lysimeters were analyzed by atomic absorption spectrometry.No visible symptoms of toxicity were observed during the three- month culture. Kenaf and corn tolerate trace metals content in sludge. Results showed that Zn and Cdwere found in corn and kenaf shoots at different levels,2.49 mg/kg of Cd and 82.5 mg/kg of Zn in kenaf shoots and2.1mg/kgofCdand10.19mg/kgincornshoots. Quantities of extracted tracemetals showed that decontamination of Zn and Cd polluted substrates is possible bycorn and kenaf crops. Tolerance and bioaccumulation factors indicated that both species could be used in phytoremediation.
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