BACKGROUND, AIM AND SCOPE: Water quality impairment by heavy metal contamination is on the rise worldwide. Phytoremediation technology has been increasingly applied to remediate wastewater and stormwater polluted by heavy metals. MATERIALS AND METHODS: Laboratory analysis and field trials were conducted to evaluate the uptake of metals (Al, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) by an aquatic plant, water lettuce (Pistia stratiotes L.), and metal distribution in the plant. RESULTS: The growth of water lettuce reduced Al, Fe, and Mn concentrations in water by >20%, K and Cu by >10%, and Ca, Mg, Zn, and Na to a lesser extent. A larger proportion of Ca, Cd, Co, Fe, Mg, Mn, and Zn was adsorbed or deposited on the external root surfaces while more Al, Cr, Cu, Ni, and Pb were absorbed and accumulated within the roots. DISCUSSION: Water lettuce has a great ability in concentrating metals from its surrounding water with a concentration factor (CF) ≥10(2). The bio-concentration factor (BCF), which excludes the part on the root surfaces, is a more appropriate index than the CF for the differentiation of hyperaccumulation, accumulation, or non-accumulation plants for metals. CONCLUSIONS: Water lettuce is a hyperaccumulator for Cr, Cu, Fe, Mn, Ni, Pb, and Zn and can be applied for the remediation of surface waters. RECOMMENDATIONS AND PERSPECTIVES: Further study on the bioavailability of metals in the water lettuce is needed for the beneficial use of metal-enriched plant biomass.
BACKGROUND, AIM AND SCOPE: Water quality impairment by heavy metal contamination is on the rise worldwide. Phytoremediation technology has been increasingly applied to remediate wastewater and stormwater polluted by heavy metals. MATERIALS AND METHODS: Laboratory analysis and field trials were conducted to evaluate the uptake of metals (Al, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) by an aquatic plant, water lettuce (Pistia stratiotes L.), and metal distribution in the plant. RESULTS: The growth of water lettuce reduced Al, Fe, and Mn concentrations in water by >20%, K and Cu by >10%, and Ca, Mg, Zn, and Na to a lesser extent. A larger proportion of Ca, Cd, Co, Fe, Mg, Mn, and Zn was adsorbed or deposited on the external root surfaces while more Al, Cr, Cu, Ni, and Pb were absorbed and accumulated within the roots. DISCUSSION: Water lettuce has a great ability in concentrating metals from its surrounding water with a concentration factor (CF) ≥10(2). The bio-concentration factor (BCF), which excludes the part on the root surfaces, is a more appropriate index than the CF for the differentiation of hyperaccumulation, accumulation, or non-accumulation plants for metals. CONCLUSIONS:Water lettuce is a hyperaccumulator for Cr, Cu, Fe, Mn, Ni, Pb, and Zn and can be applied for the remediation of surface waters. RECOMMENDATIONS AND PERSPECTIVES: Further study on the bioavailability of metals in the water lettuce is needed for the beneficial use of metal-enriched plant biomass.
Authors: Mahesh W Jayaweera; Jagath C Kasturiarachchi; Ranil K A Kularatne; Suren L J Wijeyekoon Journal: J Environ Manage Date: 2007-03-26 Impact factor: 6.789
Authors: Ludmiła Polechońska; Aleksandra Samecka-Cymerman; Małgorzata Dambiec Journal: Environ Sci Pollut Res Int Date: 2016-12-27 Impact factor: 4.223
Authors: Fernanda S Farnese; Juraci A Oliveira; Elder A S Paiva; Paulo E Menezes-Silva; Adinan A da Silva; Fernanda V Campos; Cléberson Ribeiro Journal: Front Plant Sci Date: 2017-04-19 Impact factor: 5.753