Long-Term Effects of Silver Nanoparticles (Nm-300k) and Soil Amendments on the Soil Community in a Semi-Field Experiment
28 Pages Posted: 14 Mar 2022
Toxicity of silver nanoparticles (AgNP) has been intensely studied due to a rise in applications in various products. However, most studies were conducted under laboratory conditions and were typically short-term. Here we focus on how AgNP behave under semi-field conditions in a long-term study, which lasted for 600 days. The aim of this study was to determine the effect of AgNP (NM-300K) and AgNO 3 in three soil treatments (RefeSol, biochar and compost) on soil respiration, soil mesofauna and the reproduction of F. candida . To our knowledge, this is the first long-term study on effects of AgNP on a soil community under semi-natural conditions. Additionally, we compared F. candida reproduction in freshly spiked RefeSol with RefeSol aged in the field. The presence AgNP and AgNO 3 at a concentration of 30 mg kg -1 soil resulted in significant time dependent inhibition of soil microbial biomass and F. candida reproduction in RefeSol. Soil mesofauna abundance was only temporarily reduced by AgNO 3 . No significant effect of AgNP and AgNO 3 on any of the measured parameters were detected by the end of the experiment. Biochar and compost, as soil amendment, demonstrated excellent soil remediation capabilities for AgNP both short and long-term.
Keywords: Silver nanoparticles, biochar, compost, long-term effects, Collembola, field experiment
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