The impact of iron oxide magnetic nanoparticles on the soil bacterial community

Abstract

Purpose Iron oxide magnetic nanoparticles (IOMNPs) have numerous exciting applications due to their unique chemical and physical properties. With increased applications of engineered nanostructures, releases of such materials to soil are undoubtedly inevitable. Their potential environmental risks have attracted increasing concern. One area of concern is their effect on microorganisms, which are important components of ecosystems. Materials and methods In this work, the effect of IOMNPs

Synthesis of a novel nanopesticide and its potential toxic effect on soil microbial activity

“…The decrease of Q total can relate to the inhibition and even death of soil microorganism which is similar to other pesticides (Prado and Airoldi 2000). He et al noted that iron oxide magnetic nanoparticles has a negative impact on the soil bacterial community (He et al 2011). It has also been reported by Prado and Airoldi (2001) presence of diuron resulted in the decrease of the microorganism in soil.…”

“…The IC 50 of soil with the effect of CM-b-CDMNPs-Diuron is 107.07 mg/g(The inclusion quantity of diuron is 5.21 mg).This dose is much higher than the dose of diuron (398.5 lg/g) able to eliminate soil microbial activity (Prado and Airoldi 2001). This result suggests that CM-b-CD-MNPs-Diuron has much lower toxicity to microorganism than diuron due to the more efficient and effective release of diuron from CM-b-CDMNPs-Diuron and certain degree of positive effect of Fe 3 O 4 MNPs (He et al 2011). …”

“…A possible explanation is that the soil microbes start to tolerate and adapt the inhibitor after 21 days which is in accordance with the environmental change by conversion of proliferation and metabolism. In addition, the iron of CM-b-CD-MNPs can act as a cofactor for a large number of enzymes forming a part of cytochromes and is required for many biochemical reaction, including respiration, photosynthetic transport, nitrate synthesis, nitrogen fixation, and DNA synthesis (He et al 2011). …”

“…The results indicate that the increase of the dose of CM-b-CD-MNPs-Diuron provokes the decrease of the abundance of the soil bacterial community. It has been reported that diuron has a negative effect on the microbial population(Prado and Airoldi 2001) and iron-based nanoparticles are toxic to bacterial community of soil due to the generation of reactive oxygen species(He et al 2011). And for actinobacteria, the population does not change significantly in microcosms containing soil and different doses of CMb-CD-MNPs-Diuron.…”

Arbuscular Mycorrhizal Fungi Alleviate the Negative Effects of Iron Oxide Nanoparticles on Bacterial Community in Rhizospheric Soils

“…The community structure of soil bacterial assemblages has been previously studied (He et al, 2011;Kumar et al, 2012). To display a high resolution of the composition of the soil bacterial community and to follow their shifts in response to Fe 3 O 4 NPs, Miseq pyrosequencing technology was utilized in the present investigation.…”