Zhu, H., Han, J., Xiao, J. Q. & Jin, Y. Uptake, translocation and accumulation of manufactured iron oxide nanoparticles by pumpkin plants. J. Environ. Monitor. 10, 713-717
University of Delaware, Department of Physics and Astronomy, Newark, Delaware, USA.Journal of Environmental Monitoring (Impact Factor: 2.18). 07/2008; 10(6):713-7. DOI: 10.1039/b805998e
Rapid development and application of nanomaterials and nanotechnology make assessment of their potential health and environmental impacts on humans, non-human biota, and ecosystems imperative. Here we show that pumpkin plants (Cucurbita maxima), grown in an aqueous medium containing magnetite (Fe3O4) nanoparticles, can absorb, translocate, and accumulate the particles in the plant tissues. These results suggest that plants, as an important component of the environmental and ecological systems, need to be included when evaluating the overall fate, transport and exposure pathways of nanoparticles in the environment.
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- "However, these magnetic Fe 3 O 4 particles provide poor sorption capacities due to limited sorption sites on the surface of each particle . In addition, the use of bare Fe 3 O 4 nano particles as environmental materials increases the chance for the bio-toxicity in aqueous organisms and higher plant species  . Modification/stabilization of magnetic particles using materials with a high sorption capacity can increase the efficiency of the resulting composite materials as well as reduce the bio-toxicity of Fe 3 O 4 . "
ABSTRACT: The separation of a spent sorbent from treated water after remediation is one of the major difficulties associated with industrial scale water treatment methods. Fe3O4 particles offer an easy magnetic method for the separation of used sorbent from water. Due to its low sorption capacity, magnetic Fe3O4 particles were first modified with Mg2Al-NO3-LDH prior to use in phosphate remediation. The Fe3O4/Mg2Al-NO3-LDH composite materials showed a maximum sorption capacity of 33.4 mgP/g while Fe3O4 particles alone recovered only 4.6 mgP/g. The kinetics of phosphate sorption onto Fe3O4/Mg2Al-NO3-LDH follows the pseudo-second order kinetic model supported by the best linear regression coefficient value (R2—1.00). Sorption isotherm studies indicated that it follows the Langmuir monolayer sorption isotherm. The effect of pH and competing anion studies indicate that this material is highly efficient in a wide pH range (pH 3–10). Selective sorption of phosphate on Fe3O4/Mg2Al-NO3-LDH was observed in the presence of excess sulfate, as well as from sea water enriched with phosphate. Fe3O4/Mg2Al-NO3-LDH composite material offers easy separation of spent sorbents due to magnetic property. The retention of sorption capacity in a wide pH range, and selectivity in the presence of competing anion, as well as from sea water suggests that these composite magnetic materials will be effective for wastewater remediation.
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- "Finally, to understand how AgNPs affect plants and their products, not only studies are needed on uptake, transport and accumulation (e.g. this study) but also follow-up studies on gene regulation and at the genomic level are required, which currently are possible only for model plant species (Yuan et al. 2008). Because of these advantages, Arabidopsis is frequently used instead of more commercially important crop species in studies of nanotoxicity (Ma et al. 2011; Stampoulis et al. 2009; Zhu et al. 2008). We tested three different sizes (20, 40, 80 nm) of AgNPs in hydroponic growth media to determine size and concentration effect. "
DESCRIPTION: This is 2013 paper in Nanotoxicology which cannot be authored in ResearchGate.
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- "In addition, iron oxide NPs are environmentally benign, readily available or easy to synthesize, magnetically sensitive, redox active and bio-functionalizable. Iron is an important microelement related to many physiological reactions and is an important component of chlorophyll. Moreover, the phytotoxicity profile of NPs has also been investigated by researchers via seed germination and root elongation tests, which showed no toxicity effects of NPs on plant physiologies (González-Melendi et al. 2008; Zhu et al. 2008). Thus, Fe-oxides are relatively safe for nanoparticulate delivery in plants. "
ABSTRACT: In the present study, we demonstrate magnetic iron (III) oxide nanoparticle (Fe2O3 NPs) uptake by the Solanum lycopersicum (S. lycopersicum) plant. The S. lycopersicum seeds were coated with Fe2O3 NPs and allowed to germinate in moistened sand bed. The seedlings are observed for 20 days and then it was post treated using different amounts of Fe2O3 NPs in hydroponic solution for 10 days. The plant was allowed to grow in green house for three months and uptake of NP through roots and translocation into different parts was studied. For this, we have segmented the plants and incubated with 10% NaOH solution. It is found that the NPs are deposited preferentially in root-hairs, root-tips followed by nodal and middle zone of plant. The iron present in the whole plant was quantitatively estimated by treating dry biomass of the plant in acid. The Fe2+/Fetotal increased with increasing concentration of NPs and >45% ferrous iron suggests the biomineralization of NPs due to rich phytochemicals in plants. We believe the present study is useful to build a base line data for novel applications in agri-nanotechnology
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