Cadmium accumulation by Axonopus compressus (Sw.) P. Beauv and Cyperus rotundas Linn growing in cadmium solution and cadmium-zinc contaminated soil

• Published in: Wārasān Songkhlā Nakharin Vol. 29; no. 3; pp. 881 - 892
• Main Authors: Vibol Sao, King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Joint Graduate School of Energy an Environment, Woranan Nakbanpote, King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Pilot Plant Development and Training Institute, Paitip Thiravetyan, King Mongkut's University of Technology Thonburi, Bangkok (Thailand). School of Bioresources and Technology
• Format: Journal Article
• Language: English
• Published: Prince of Songkla University 01.05.2007
• Subjects: AXONOPUS; Axonopus compressus; Axonopus compressus (Sw.) P. Beauv; BIOREMEDIATION; Cadmium; CONTAMINATION; Cyperus rotundas; Cyperus rotundas Linn; CYPERUS ROTUNDUS; GROWTH; Phytoremediation; POLLUTED SOIL; POLLUTION CONTROL; SOLUTIONS; ZINC
• ISSN: 0125-3395

This research investigated the phyto-remediation potentials of Cyperus rotundas Linn (Nutgrass) and Axonopus compressus (Sw.) P. Beauv (Carpetgrass) for cadmium removal from cadmium solution andcadmium-zinc contaminated soil. Plants growth in the solution showed that cadmium decreased the relative growth rate of both grasses. However, the amount of cadmium accumulated in shoot and root was increasedwith the increase in cadmium concentration and exposure time. Growth in fertile soil mixed with Cd-contaminated zinc silicate residue (65% Si, 19% Ca, 2% Zn, 1% Mg and 0.03% Cd) at the ratio of 50:50 (w/w)for 30 days showed that C. rotundas Linn accumulated cadmium in root and shoot to 2,178 and 1,144 mg kg-1 dry weight, respectively. A. compressus (Sw.) P. Beauv accumulated cadmium in root and shoot to 1,965and 669 mg kg-1 dry weight, respectively. Scanning electron microscope connected to energy-dispersive X-ray spectroscopy suggested that the mechanism of cadmium accumulation by both grasses involved thecadmium precipitation in the stable form of cadmium silicate, which indicated that C. rotundas Linn and A. compressus (Sw.) P. Beauv could be grown to prevent soil erosion and to remediate cadmium-contaminatedsoil.