The aim of this work was to investigate the effect ofengineered nanoparticles (NPs) on soil microbial biomass C(MBC) and on earthworm Lumbricus rubellus. An artificialsoil was incubated for 4 weeks with earthworms fed withvegetable residues contaminated by NPs, consisting of Ag,Co, Ni and TiO2. After the treatments, soils were analysed for MBC and total and water soluble metal-NPs, whereasearthworms were purged for 28 days and then analysedfor fatty acids (FAs) and total metal-NPs. Longitudinalsections of earthworms were investigated by environmentalscanning electron microscopy (ESEM), equipped withenergy-dispersive X-ray spectroscopy (EDS), to provideinsights about the retention and localization of NPs withinearthworms. The nanoparticles reduced the MBC content inthe following order Ag>Co>Ni, whereas TiO2 did not affectit. The ESEM-EDS analysis confirmed NP retention in earthwormguts and tissues. The solid/water coefficient of partitionsuggested that NPs interfered with living organisms due totheir presence in suspension. Among the 27 FAs identified inearthworm tissues, the eicosapentaenoic acid (20:5ω3) wasthe most abundant. The degree of unsaturation of FAs wasreduced by supplying NP-contaminated food.
|Numero di pagine||9|
|Rivista||Biology and Fertility of Soils|
|Stato di pubblicazione||Published - 2014|
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