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Arsenic removal from waters by bioremediation with the aquatic plants Water Hyacinth (Eichhornia crassipes) and Lesser Duckweed (Lemna minor)
- Alvarado, Sandra, Guédez, Magdiel, Lué-Merú, Marcó P., Nelson, Graterol, Alvaro, Anzalone, Jesús, Arroyo C., Gyula, Záray
- Bioresource technology 2008 v.99 no.17 pp. 8436-8440
- Eichhornia crassipes, Lemna minor, aquatic plants, arsenic, atomic absorption spectrometry, bioaccumulation, biomass production, bioremediation, hydrides, plant density
- In this study the removal of arsenic by the Water Hyacinth (Eichhornia crassipes) and Lesser Duckweed (Lemna minor) was monitored under a concentration of 0.15mgL⁻¹ of the element. Plant densities were 1kg/m² for Lesser Duckweed and 4kg/m² for Water Hyacinth on a wet basis. The arsenic was determined in foliar tissue and water samples by hydride generation atomic absorption spectroscopy. The element was monitored as a function of time during 21 days. No significant differences were found in the bioaccumulation capability of both species. The removal rate for L. minor was 140mg As/had with a removal recovery of 5%. The Water Hyacinth had a removal rate of 600mg As/had and a removal recovery of 18%, under the conditions of the assay. The removal efficiency of Water Hyacinth was higher due to the biomass production and the more favorable climatic conditions. This specie represents a reliable alternative for arsenic bioremediation in waters.