title: Evaluation of zinc oxide nanoparticle toxicity in sludge products applied to agricultural soil using multispecies soil systems.
abstract: To study the environmental impact of nanoparticles, the sludges of wastewater (WWTS) and water treatment (WTS) plants enriched with ZnO nanoparticles were added to agricultural soil, and the toxic effects of the nanoparticles were studied using a microcosm system based on the soil. The WWTS treated soils were characterised by statistically significant decreases (p<0.05) in Vicia sativa germination at the lowest (76.2%) and medium (95.2%) application rates, decreases in the fresh biomass for Triticum aestivum (19.5%), Raphanus sativus (64.1%), V. sativa (37.4%) and Eisenia fetida (33.6%) at the highest application rate and a dose-related significant increase (p<0.05) in earthworm mortality. In WTS amended soils, significant reductions (p<0.05) of the fresh biomass (17.2%) and the chlorophyll index (24.4%) for T. aestivum and the fresh biomass for R. sativus (31.4%) were only recorded at the highest application doses. In addition, the soil phosphatase enzymatic activity decreased significantly (p<0.05) in both WWTS (dose related) and WTS treatments. For water organisms, a slight inhibition of the growth of Chlorella vulgaris was observed (WWTS treated soils), along with statistically significant dose-related inhibition responses on total glutathione cell content, and statistically significant dose-related induction responses on the glutathione S-transferase enzyme activity and the reactive oxygen species generation on the RTG-2 fish cell line.
authors.affiliation: INIA, Department of Environment, Crta de La Coruña Km 7, 28040 Madrid, Spain. Electronic address: mdfdez@inia.es.
authors.forename: María Dolores
authors.initials: MD
authors.lastname: Fernández
authors.affiliation: INIA, Department of Environment, Crta de La Coruña Km 7, 28040 Madrid, Spain. Electronic address: alonso.nieves@inia.es.
authors.forename: María Nieves
authors.initials: MN
authors.lastname: Alonso-Blázquez
authors.affiliation: INIA, Department of Environment, Crta de La Coruña Km 7, 28040 Madrid, Spain. Electronic address: cgarcia@inia.es.
authors.forename: Concepción
authors.initials: C
authors.lastname: García-Gómez
authors.affiliation: INIA, Department of Environment, Crta de La Coruña Km 7, 28040 Madrid, Spain. Electronic address: babin@inia.es.
authors.forename: Mar
authors.initials: M
authors.lastname: Babin
mesh_terms: D000383:Agriculture / Q000379:methods; D000818:Animals; D005982:Glutathione Transferase / Q000378:metabolism; D053758:Nanoparticles / Q000633:toxicity*; D009835:Oligochaeta; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000633:toxicity*; D014908:Triticum; D014865:Waste Disposal, Fluid / Q000379:methods; D015034:Zinc Oxide / Q000633:toxicity*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D005982:Glutathione Transferase; D015034:Zinc Oxide
keywords: Bioassays; Sewage sludge; Soil microcosm; Zinc nanoparticles