nerc.ac.uk

Bioturbation of Ag2S-NPs in soil columns by earthworms

Baccaro, Marta; Harrison, Samuel; van den Berg, Hans; Sloot, Laura; Hermans, Davy; Cornelis, Geert; van Gestel, Cornelis A.M.; van den Brink, Nico W.. 2019 Bioturbation of Ag2S-NPs in soil columns by earthworms. Environmental Pollution, 252 (A). 155-162. https://doi.org/10.1016/j.envpol.2019.05.106

Before downloading, please read NORA policies.
[img] Text
N523813PP.pdf - Accepted Version
Restricted to NORA staff only until September 2021.

Download (885kB)
[img] Text
N523813SIPP.pdf - Accepted Version
Restricted to NORA staff only until September 2021.

Download (1MB)

Abstract/Summary

Sewage sludge contains Ag2S-NPs causing NP exposure of soil fauna when sludge is applied as soil amendment. Earthworm bioturbation is an important process affecting many soil functions. Bioturbation may be affected by the presence of Ag2S-NPs, but the earthworm activity itself may also influence the displacement of these NPs that otherwise show little transport in the soil. The aim of this study was to determine effects of Ag2S-NPs on earthworm bioturbation and effect of this bioturbation on the vertical distribution of Ag2S-NPs. Columns (12 cm) of a sandy loamy soil with and without Lumbricus rubellus were prepared with and without 10 mg Ag kg−1, applied as Ag2S-NPs in the top 2 cm of the soil, while artificial rainwater was applied at ∼1.2 mm day−1. The soil columns were sampled at three depths weekly for 28 days and leachate collected from the bottom. Total Ag measurements showed more displacement of Ag to deeper soil layers in the columns with earthworms. The application of rain only did not significantly affect Ag transport in the soil. No Ag was detected in column leachates. X-ray tomography showed that changes in macro porosity and pore size distribution as a result of bioturbation were not different between columns with and without Ag2S-NPs. Earthworm activity was therefore not affected by Ag2S-NPs at the used exposure concentration. Ag concentrations along the columns and the earthworm density allowed the calculation of the bioturbation rate. The effect on the Ag transport in the soil shows that earthworm burrowing activity is a relevant process that must be taken into account when studying the fate of nanoparticles in soils.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/j.envpol.2019.05.106
CEH Sections/Science Areas: Pollution (Science Area 2017-)
ISSN: 0269-7491
Additional Keywords: bioturbation, earthworms, nanoparticles, transport, soil
NORA Subject Terms: Agriculture and Soil Science
Date made live: 19 Jun 2019 11:53 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/523813

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...