Eichhornia crassipes mediated copper phytoremediation and its success using catfish bioassay.

Copper (Cu) pollution in aquaculture ponds poses substantial ecological threats. Most phytoremediation studies deal with the efforts of removing Cu from water, but seldom, such endeavors are validated by suitable bioassays. The present study undertook a two-pronged effort to remediate Cu by phytoextraction with an aquatic macrophyte, Eichhornia crassipes, and establish the efficacy of such endeavors by Clarias batrachus bioassay.

Screening of cadmium and copper phytoremediation ability of Tagetes erecta, using biochemical parameters and scanning electron microscopy-energy-dispersive X-ray microanalysis.

Tagetes erecta thrived in phytotoxic levels of cadmium (Cd; 50-300 mg kg ) and copper (Cu; 150-400 mg kg ) for 21 d. It accumulated high metal contents in its above-ground tissues (3675 mg Cd kg dry wt and 3948 mg Cu kg dry wt) and showed greater root to shoot translocation and a high extraction coefficient, all of which pointed toward its potential as a hyperaccumulator. Both Cd stress and Cu stress reduced the plant biomass, foliar area, and number.

Copper phytoremediation potential of Calandula officinalis L. and the role of antioxidant enzymes in metal tolerance.

Cu phytoremediation potential of an ornamental plant, Calandula officinalis, was explored in terms of growth responses, photosynthetic activities and antioxidant enzymes such as SOD, CAT and GPX. The results showed that this plant had high Cu tolerance of up to 400 mg/kg, which is far above the phytotoxic range for non hyperaccumulators. It grew normally in soils at all the doses (150-400 mg/kg) without showing external signs of phytotoxicity.

A Study on Cadmium Phytoremediation Potential of Indian Mustard, Brassica juncea.

The objective of this study was to investigate Cd phytoremediation ability of Indian mustard, Brassica juncea. The study was conducted with 25, 50, 100, 200 and 400 mg Kg(-1) CdCl2 in laboratory for 21 days and Cd concentrations in the root, shoot and leaf tissues were estimated by atomic absorption spectroscopy. The plant showed high Cd tolerance of up to 400 mg Kg(-1) but there was a general trend of decline in the root and shoot length, tissue biomass, leaf chlorophyll and carotenoid contents.

A study on cadmium phytoremediation potential of water lettuce, Pistia stratiotes L.

Aquatic macrophytes have tremendous potential for remediation of the heavy metal cadmium. The objective of this study was to investigate Cd phytoremediation ability of water lettuce, Pistia stratiotes L. The study was conducted with 5, 10, 15 and 20 mg L(-1) CdCl2 in hydroponic system for 21 days and the Cd concentrations in the root and shoot tissues were estimated by atomic absorption spectroscopy.