Phytoremediation of Cr(III) by Ipomonea aquatica (water spinach) from water in the presence of EDTA and chloride: Effects of Cr speciation

Phytoremediation of Cr(III) by Ipomonea aquatica (water spinach) from water in the presence of EDTA and chloride: Effects of Cr speciation

2010

E02847

Wastewater is often co-contaminated with chromium, chelating agents, and chloride. Influences of Crpd speciation on Cr phytoremediation by Ipomonea aquatica were investigated. MINEQL+ was employed to estimate Cr speciation. Statistic regression was used to investigate the relationships between Cr speciation and accumulation. I. aquatica accumulated high Cr concentration (13,217mgkgp#) in the root at Crpd of 10mglp# and EDTA of 10t M after 14 d growth. Pearson correlation analysis indicates that root Cr concentration significantly correlated with Cr-EDTA speciation (r =0.67, p <0.05) and Cr-Cl speciation (r =0.91, p <0.01). Shoot Cr concentration also significantly correlated with Cr-Cl speciation (r =0.97, p <0.01). An increase in Cl concentration to 1.72c10t M enhanced root Cr concentration; however, the accumulation of root Cr was inhibited at high Cl concentration (5.76c10e M). Microscopic image showed that a high portion of Crpd accumulated on the root surface.

v.101(9):3033-3039, BIORESOURCE TECHNOLOGY

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