Phytoremediation in Wetland Ecosystems: Progress, Problems, and Potential

Williams, J.

doi:10.1080/0735-260291044386

Cited by 144 publications

(64 citation statements)

References 84 publications

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“…In a reduced condition, most of the metal often binds to sulfides in the sediment. This form of metals is unavailable to plant uptake (Weis & Weis, 2004;Williams, 2002).…”

Section: Discussionmentioning

confidence: 99%

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Uptake and distribution of N, P and heavy metals in three dominant salt marsh macrophytes from Yangtze River estuary, China

Quan

Han

Shen

et al. 2007

Marine Environmental Research

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“…In a reduced condition, most of the metal often binds to sulfides in the sediment. This form of metals is unavailable to plant uptake (Weis & Weis, 2004;Williams, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Metal dynamics in salt marshes may be influenced by the composition of plant communities (Williams, 2002;Windham et al, 2003). Recent investigations demonstrate that concentrations of metals in plant tissues are highly variable between species (Fitzgerald, Caffrey, Nesaratnam, & McLoughlin, 2003;Ye, Baker, Wong, & Willis, 1997).…”

mentioning

confidence: 99%

Uptake and distribution of N, P and heavy metals in three dominant salt marsh macrophytes from Yangtze River estuary, China

Quan

Han

Shen

et al. 2007

Marine Environmental Research

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“…The decrease in the removal efficiency of As in solution along with high concentrations of the metalloid showed the viability of using the phytoremediation technique, mainly in environments with medium to low pollutant concentration (Schnoor, 1997;Lasat, 2002;Pilon-Smits & Pilon, 2002;Williams, 2002;Tsao, 2003;Pilon-Smits, 2005).…”

Section: Symptomatologymentioning

confidence: 99%

Potential of macrophyte for removing arsenic from aqueous solution

et al. 2012

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-The potential of three aquatic macrophytes, Azoll caroliniana, Salvinia minima and Lemna gibba, was evaluated in this work aimed at selection of plants to be used in remediation of environments contaminated by arsenic (As). The experiments were carried out in a greenhouse during six days in pots containing Hoagland solution (¼ ionic strength) at As concentrations of 0.5; 2.5 and 5.0 mg L -1 . The three species showed greater As accumulation as the concentration of the metalloid in solution increased. However, a reduction was detected in fresh and dry mass gain when the plants were exposed to high As concentrations. The macrophytes showed differences in efficiency of removal of As in solution. A. caroliniana, S. minima and L. gibba accumulated, on average, 0.130; 0.200; and 1.397 mg mDM -1 , respectively, when exposed to 5.0 mg L -1 of As. The macrophytes absorbed a greater quantity of As in solution with low phosphate content. The greater As concentration in L. gibba tissues lowered the chlorophyll and carotenoid contents as shown by the high chlorosis incidence. Lemna gibba also exhibited a decrease in leaf size, with the total chlorophyll and carotenoid synthesis not being affected by As in A. caroliniana. This species exhibited purplish leaves with high concentration of anthocyanin, whose presence suggested association to phosphate deficiency. Marginal necrosis occurred on S. minima floating leaves, with the released daughter-plants not showing any visual symptoms during the treatment. The percentage of As removed from the solution decreased when the plants were exposed to high concentrations of the pollutant. Among the three species studied, only L. gibba could be considered an As hyper-accumulator. The use of this plant species for remediation of aquatic environments was shown to be limited and requires further investigation.Keywords: bio-remediation, phyto-remediation, aquatic plants, pollutant. RESUMO -O potencial de três macrófitas aquáticas -Azolla caroliniana, Salvinia mínima e Lemna gibba -foi avaliado neste estudo, com vistas à seleção de plantas para remediação de ambientes contaminados com arsênio (As). Os experimentos foram conduzidos em casa de vegetação durante seis dias, em vasos contendo solução Hoagland (¼ força iônica) e As nas concentrações de

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“…Although abundant biomass production was a desirable characteristic for remediation Potential of macrophytes for removing atrazine from aqueous solution purposes (Cunningham & Ow, 1996;Williams, 2002;Pilon-Smits & Pilon, 2002;Pilon-Smits, 2005), if the removal efficiency were the same for the three species, the use of the plant that produced less biomass could be recommended. Thus, the use of A. caroliniana and L. gibba would be indicated to remedy environments with concentrations of 0.1 mg L -1 atrazine in the water, because they produced less fresh mass.…”

Section: Efficiency Of Atrazine Removalmentioning

confidence: 99%

“…It is important to point out that the remediation efficiency of atrazine in solution decreased with the increase in the concentration of the pollutant in the environment, thus showing the efficiency of using the phytoremediation technique for environments with low to medium contamination (Cunningham & Ow, 1996;Garbisu & Alkorta, 2001;Williams, 2002;Tsao, 2003;Suresh & Ravishankar, 2004;PilonSmits, 2005).…”

Section: Atrazine Absorption By Aquatic Macrophytesmentioning

confidence: 99%

Potential of macrophytes for removing atrazine from aqueous solution

et al. 2011

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-The potential of three macrophytes, Azolla caroliniana, Salvinia minima, and Lemna gibba was assessed in this study to select plants for use in environmental remediation contaminated with atrazine. Experiments were carried out in a greenhouse over six days in pots containing Hoagland 0.25 strength nutritive solution at the following atrazine concentrations: 0; 0.01; 0.1; 1.0; 10.0 mg L -1 . Decrease in biomass accumulation was observed in the three macrophytes, as well as toxic effects evidenced by the symptomatology developed by the plants which caused their deaths. The chlorosis and necrosis allowed to observe in the plants the high sensitivity of the three species to the herbicide. Plants presented low potential for removal of atrazine in solution when exposed to low concentrations of the herbicide. However, at the 10.0 mg L -1 atrazine concentration, L. gibba and A. caroliniana showed potential to remove the herbicide from the solution (0.016 and 0.018 mg atrazine per fresh mass gram, respectively). This fact likely resulted from the processes of atrazine adsorption by the dead material. The percentage of atrazine removed from the solution by the plants decreased when the plants were exposed to high concentrations of the pollutant. Azolla caroliniana, S. minima, and L. gibba were not effective in removing the herbicide from solution. The use of these species to remedy aquatic environments was shown to be limited.Keywords: Azolla caroliniana, Salvinia minima, Lemna gibba, herbicide, bioremediation.RESUMO -Avaliou-se, neste estudo, o potencial de três macrófitas -Azolla caroliniana, Salvinia minima e Lemna gibba -com vistas à seleção de plantas para remediação de ambientes contaminados por atrazine. Foram realizados experimentos em casa de vegetação durante seis dias, em vasos contendo solução nutritiva Hoagland (0,25 de força iônica), nas seguintes concentrações de atrazine: 0; 0,01; 0,1; 1,0; e 10,0 mg L -1 . A redução da biomassa acumulada pelas macrófitas foi observada, bem como os efeitos de toxidez evidenciados pela sintomatologia desenvolvida nas plantas, os quais causaram sua morte. Clorose e necrose observadas nas plantas mostraram a alta sensibilidade das três espécies ao herbicida. As plantas demonstraram baixo potencial para remoção de atrazine, quando expostas ao herbicida em baixas doses. Entretanto, na concentração de 10,0 mg L -1 de atrazine, L. gibba e A. caroliniana mostraram potencial para remover o herbicida da solução (0,016 e 0,018 mg de atrazine por grama de massa fresca, respectivamente). Esse fato provavelmente resultou do processo de adsorção de atrazine pela matéria morta. A porcentagem de atrazine removida da solução pelas plantas diminuiu quando estas foram expostas a altas concentrações do poluente. Azolla caroliniana, S. minima e L. gibba não foram eficazes na remoção do herbicida na solução. A utilização dessas espécies para sanar ambientes aquáticos mostrou-se limitada.

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Phytoremediation in Wetland Ecosystems: Progress, Problems, and Potential

Cited by 144 publications

References 84 publications

Uptake and distribution of N, P and heavy metals in three dominant salt marsh macrophytes from Yangtze River estuary, China

Uptake and distribution of N, P and heavy metals in three dominant salt marsh macrophytes from Yangtze River estuary, China

Potential of macrophyte for removing arsenic from aqueous solution

Potential of macrophytes for removing atrazine from aqueous solution

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