Concurrent removal and accumulation of heavy metals by the three aquatic macrophytes

Mishra, Virendra Kumar; Tripathi, B. D.

doi:10.1016/j.biortech.2008.01.002

Cited by 319 publications

(115 citation statements)

References 20 publications

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“…Cr, a non-essential element for plants, is highly detrimental to plant growth and development (Mishra and Tripathi 2008). An EC 50 value of 5.2 mg/L was previously reported in L. minor for 7 days of Cr exposure (Blinova 2004).…”

Section: Resultsmentioning

confidence: 99%

Phytoremediation of Cu, Cr and Pb Mixtures by Lemna minor

Üçüncü

Tunca

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%

Phytoremediation of Cu, Cr and Pb Mixtures by Lemna minor

Üçüncü

Tunca

Fikirdeşici

et al. 2013

Bull Environ Contam Toxicol

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“…Kwan and Smith (32) have shown that Ca affects Cd accumulation in Lemna minor. A study with other macrophytes has also suggested that micronutrients are taken up by plants faster than nonessential heavy metals (33).…”

Section: Disscusionmentioning

confidence: 99%

Effect of Copper on the Toxicity and Genotoxicity of Cadmium in Duckweed (Lemna Minor L.)

Cvjetko

Tolić

Šikić

et al. 2010

Archives of Industrial Hygiene and Toxicology

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We investigated interactions between copper (in the concentrations of 2.5 µmol L -1 and 5 µmol L -1 ) and cadmium (5 µmol L -1 ) in common duckweed (Lemna minor L.) by exposing it to either metal or to their combinations for four or seven days. Their uptake increased with time, but it was lower in plants treated with combinations of metals than in plants treated with either metal given alone. In separate treatments, either metal increased malondialdehyde (MDA) level and catalase and peroxidase activity. Both induced DNA damage, but copper did it only after 7 days of treatment. On day 4, the combination of cadmium and 5 µmol L -1 copper additionally increased MDA as well as catalase and peroxidase activity. In contrast, on day 7, MDA dropped in plants treated with combinations of metals, and especially with 2.5 µmol L -1 copper plus cadmium. In these plants, catalase activity was higher than in copper treated plants. Peroxidase activity increased after treatment with cadmium and 2.5 µmol L -1 copper but decreased in plants treated with cadmium and 5 µmol L -1 copper. Compared to copper alone, combinations of metals enhanced DNA damage after 4 days of treatment but it dropped on day 7. In conclusion, either metal given alone was toxic/ genotoxic and caused oxidative stress. On day 4 of combined treatment, the higher copper concentration was more toxic than either metal alone. In contrast, on day 7 of combined treatment, the lower copper concentration showed lower oxidative and DNA damage. These complex interactions can not be explained by simple antagonism and/or synergism. Further studies should go in that direction.

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“…However, details about the removal or purification dynamics and mechanics are not thoroughly understood yet. 1,2 Most studies on the removal of excess nutrients or pollutants by aquatic plants are carried out by analyzing concentration changes of components in either aquatic plants 5,6 or water, 1,2 with various analytical methods. The organs of aquatic plants could be ground and then extracted to study changes of some components.…”

Section: Introductionmentioning

confidence: 99%

Real-time in-situ Simultaneous Monitoring of Dissolved Oxygen and Materials Movements at a Vicinity of Micrometers from an Aquatic Plant by Combining Deflection of a Probe Beam and Fluorescence Quenching

Inoue

2017

ANAL. SCI.

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Concurrent removal and accumulation of heavy metals by the three aquatic macrophytes

Cited by 319 publications

References 20 publications

Phytoremediation of Cu, Cr and Pb Mixtures by Lemna minor

Phytoremediation of Cu, Cr and Pb Mixtures by Lemna minor

Effect of Copper on the Toxicity and Genotoxicity of Cadmium in Duckweed (Lemna Minor L.)

Real-time in-situ Simultaneous Monitoring of Dissolved Oxygen and Materials Movements at a Vicinity of Micrometers from an Aquatic Plant by Combining Deflection of a Probe Beam and Fluorescence Quenching

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