Aquatic macrophytes potential for the simultaneous removal of heavy metals (Buenos Aires, Argentina)

Miretzky, Patricia; Saralegui, Andrea Beatriz; Cirelli, Alicia Fernández

doi:10.1016/j.chemosphere.2004.07.024

Cited by 339 publications

(157 citation statements)

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“…This result is unusual, as Cr mobility is very low in many plants due to the absence of an efficient Cr transport mechanism from the roots to the shoots, as well as the presence various barriers to Cr transport in general (Miretzky et al 2004). As such, low Cr removal rates are observed in a number of plant species.…”

Section: Resultsmentioning

confidence: 99%

“…As with Cu, similar values were obtained for 24th hour and 7th day Pb removal rates, suggesting that Pb biosorption is mostly completed within the first 24 h of exposure (Table 2). 24 h percentile removal rates of Pb by L. minor have been reported as 76 % (Axtell et al 2003) and 94.19 % (Elmacı et al 2009) within 24 h, while a 98.55 % removal rate was reported for a 15 days exposure study (Miretzky et al 2004). …”

Section: Resultsmentioning

confidence: 99%

“…High Cr removal rates in this study might indicate that the barriers for Cr transportation present in many plants are lacking in L. minor, or that the latter plant possesses a transport mechanism either specific to, or exploitable by, Cr cations. Cr sorption rates of L. minor were reported as 75 %-100 % (Wahaab et al 1995) and 96.94 % for (Miretzky et al 2004) for 10 and 15 days, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Phytoremediation of Cu, Cr and Pb Mixtures by Lemna minor

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Fikirdeşici

et al. 2013

Bull Environ Contam Toxicol

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The present study reports the capacity of the aquatic macrophyte Lemna minor to remediate combinations of Cu(II), Pb(II) and Cr(III) from a simulated natural environment. The effect of these metal mixtures on the growth of L. minor was also investigated using growth rate and biomass inhibition calculations. L. minor was successful in removing Cr and Pb from the water, and it remained an effective remediation agent when both metals were present in the environment. However, a relatively low absorption capacity was observed for Cu, increasing concentrations of which were associated with significant decreases in growth rate. No statistically significant difference was found between the 24 h and 7 days absorption rates of Cu, Pb and Cr, suggesting that, at the concentrations tested, equilibrium occurs within 24 h of metal exposure.Keywords Biomass inhibition Á Bioremediation Á Growth rate Á Phytoremediation Metals are some of the most common pollutants in the ecosystem, and their tendency to readily accumulate in food chains renders them an important health hazard.Consequently, a wide variety of physical, chemical and biological methods have been developed to remove metals from the environment, and the use of live or processed plants for the sorption of metals from aquatic ecosystems has received considerable attention in recent decades. However, most phytoremediation experiments focus separately on the removal of each individual metal, as it is difficult to account for interrelations between the accumulations of different elements in plant tissue. Such an experimental setup may not necessarily reflect a metal-contaminated natural environment, where many metals are often present in high concentrations (Horvat et al. 2007). As such, further research is necessary to fully elucidate how multiple metals affect the uptake and metabolization of each other.Lemna minor (duckweed) is an aquatic macrophyte commonly utilized in toxicology research, and it has been suggested as a potential phytoremediation agent due to its high reproductive rate, ease of culturing and capacity to absorb a variety of metals (Elmacı et al. 2009). However, the effects of multiple metal exposure on the biosorption and metal retention rates of L. minor are largely unknown. As such, we aim to elucidate the interplay between the uptake mechanisms of different metals in this aquatic plant by observing the biosorption of Cr, Pb, Cu mixtures in different concentrations by L. minor in a simulated natural environment. We also describe the toxicity of those metals, alone or in conjunction with each other, to estimate how the presence of multiple metals may alter the growth of L. minor in multi-element contaminated environments. Materials and MethodsAll studies were carried out in a semi-controlled environment, if applicable. L. minor culture conditions were

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Phytoremediation of Cu, Cr and Pb Mixtures by Lemna minor

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Tunca

Fikirdeşici

et al. 2013

Bull Environ Contam Toxicol

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“…Currently, the use of aquatic macrophytes is under investigation as a viable alternative for remediation of a wide range of contaminants including heavy metals (Hughes et al, 1996;Lee et al, 1998;Rodgers and Bunce, 2001;Miglioranza et al, 2004;Miretzky et al, 2004;Polomski et al, 2009;Augustynowicz et al, 2010;Rahman and Hasegawa, 2011). These researches emphasize that the plant-based approach to remediation of the environments highly contaminated has an interesting cost-effective, because it is cheaper than other methods and safe for human.…”

Section: Discussionmentioning

confidence: 99%

Short-term physiological responses to copper stress in Salvinia auriculata Aubl.

et al. 2014

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Aim: To evaluate, in a short-time exposure, the physiological responses of Salvinia auriculata Aubl. under different concentrations of Cu. Methods: The plants were exposed to treatments with 0.01, 0.1, 1 and 10 mM of Cu in a period of 2 days. Then development variables of S. auriculata (weight, photosynthetic pigments, and soluble carbohydrate), lipid peroxidation (malondialdehyde, aldehydes, and electrolyte leakage) and production of antioxidants (anthocyanins, carotenoids, flavonoids, and proline) were evaluated. Results: It was observed fresh weight reductions in concentrations above 1 mM of Cu. Chlorophyll a decreased with the increase of Cu concentrations unlike chlorophyll b. The ratio chlorophyll a / chlorophyll b was changed due to the degradation of photosynthetic pigments. The reductions of carotenoids were more pronounced than that of total chlorophyll. The values of electrolyte leakage ranged from 14 to 82 % and lipid peroxidation from 7 to 46 nmol.g -1. Flavonoids and soluble carbohydrates showed reductions with the increase of Cu concentration. Anthocyanins, phenolic compounds, and proline when subjected to 0.1 mM of Cu had increased, suggesting adaptability of plant stress caused directly by metal and reactive oxygen species. In higher concentrations, degradation and/or direct modifications of these molecules possibly occurred. Conclusions: The data suggest that S. auriculata is provided with an efficient mechanism against stress caused by Cu in the concentration of 0.1 mM. As for higher concentrations (1 and 10 mM), despite its role as micronutrients, Cu was toxic to the plant due to the redox behavior of this metal, which leads to the exacerbated formation of reactive oxygen species, inducing to severe damage such as biological membrane degradation and protein denaturation.Keywords: lipid peroxidation, antioxidant, proline, metal stress.Resumo: Objetivo: avaliar em curto tempo de exposição às respostas fisiológicas de Salvinia auriculata Aubl. sob diferentes concentrações de Cu. Métodos: as plantas foram expostas a tratamentos com 0,0; 0,01; 0,1; 1 e 10 mM de Cu em um período de 2 dias. Em seguida foram avaliadas variáveis de desenvolvimento de S. auriculata (peso, pigmentos fotossintéticos e carboidratos solúveis), peroxidação lipídica (malonaldeído, aldeídos e extravasamento de eletrólitos) e produção de antioxidantes (antocianinas, carotenóides, flavonóides e prolina). Resultados: Foram verificadas reduções das massas frescas nas concentrações acima de 1 mM de Cu. A clorofila a reduziu com o aumento da concentração de Cu, diferentemente da clorofila b. A razão clorofila a/clorofila b foi alterada, devido à degradação dos pigmentos fotossintéticos. As reduções dos carotenóides foram mais acentuada do que a de clorofila total. Os valores de extravasamento de eletrólitos variaram de 14 a 82 % e peroxidação lipídica de 7 a 46 nmol.g -1. Flavonóides e carboidratos solúveis mostraram reduções com o aumento da concentração de Cu. Antocianinas, compostos fenólicos e prolina quando submetida...

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“…Eichhornia crassipes is common macrophyte which is abundant in wetlands, lakes and ditches. As it has a high growth-rate, fibrous root system and broad leaves along with tendency to tolerate high metal concentration, it is considered as an important species to be used in phytoremediation [4,5]. Some macrophytes are found to remove different concentrations of arsenic ions, which make them suitable to act as bio-monitors for metals, and have ability to act as biological filters of the aquatic environment [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%