Acetamiprid fate in a sandy loam with contrasting soil organic matter contents: A comparison of the degradation, sorption and leaching of commercial neonicotinoid formulations

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Potts, J., Jones, D. L., Macdonald, A. J., Ma, Q. and Cross, P. 2022. Acetamiprid fate in a sandy loam with contrasting soil organic matter contents: A comparison of the degradation, sorption and leaching of commercial neonicotinoid formulations. Science of the Total Environment. 842 (10 Oct), p. 155711. https://doi.org/10.1016/j.scitotenv.2022.156711

AuthorsPotts, J., Jones, D. L., Macdonald, A. J., Ma, Q. and Cross, P.
Abstract

The impacts of neonicotinoids have generally focussed on the responses of the pure active ingredient. Using a selection of two commercial formulations and the active ingredient, we ran three laboratory studies using C-14-labelled acetamiprid to study the leaching, sorption and mineralisation behaviours of the commercially available neonicotinoid formulations compared to the pure active ingredient. We added C-14-spiked acetamiprid to a sandy loam soil that had received long-term additions of farmyard manure at two rates (10 t/ha/yr and 25 t/ha/yr) and mineral fertilisers, as a control. We found significant differences in acetamiprid mineralisation across both the SOM and chemical treatments. Sorption was primarily impacted by changes in SOM and any differences in leachate recovery were much less significant across both treatment types. The mineralisation of all pesticide formulations was comparatively slow, with < 23 % of any given chemical/soil organic matter combination being mineralised over the experimental period. The highest mineralisation rates occurred in samples with the highest soil organic matter levels. The results also showed that 82.9 % & PLUSMN; 1.6 % of the acetamiprid applied was leached from the soil during repeated simulated rainfall events. This combined with the low sorption values, and the low rates of mineralisation, implies that acetamiprid is highly persistent and mobile within sandy soils. As a highly persistent neurotoxin with high invertebrate selectivity, the presence of neonicotinoids in soil presents a high toxicology risk to various beneficial soil organisms, including earthworms, as well as being at high risk of transfer to surrounding watercourses.

KeywordsAcetamiprid ; Environmental fate; Persistence in soil; Environmental risk; Soil management
Year of Publication2022
JournalScience of the Total Environment
Journal citation842 (10 Oct), p. 155711
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2022.156711
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition [ISPG]
Output statusPublished
Publication dates
Online17 Jun 2022
Publication process dates
Accepted11 Jun 2022
PublisherElsevier Science Bv
ISSN0048-9697

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