Behaviour of neonicotinoids in contrasting soils

Aseperi, Adeniyi K.; Busquets, Rosa; Hooda, Peter S.; Cheung, Philip C.W.; Barker, James

doi:10.1016/j.jenvman.2020.111329

Cited by 43 publications

(26 citation statements)

References 43 publications

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“…Sorption coefficients can vary significantly based on factors such as solution ion content, 68 and neonicotinoids such as imidacloprid have been shown to be highly influenced by adsorbent organic matter content. 69 Nonetheless, the sorption behavior of imidacloprid in the present study is consistent with these previous results.…”

Section: Pesticide Treatment Potentialsupporting

confidence: 93%

Assessment of Woodchip Bioreactor Characteristics and Their Influences on Joint Nitrate and Pesticide Removal

et al. 2021

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We constructed a bench-scale continuous-flow (8 L total volume, 4.3 L/day) woodchip bioreactor and operated the reactor under field-like conditions to evaluate joint pesticide and nitrate removal. The continuous-flow reactor achieved 83.5 ± 8% diuron removal and 61.6 ± 11.9% imidacloprid removal with a 24 h hydraulic retention time (HRT). We designed a sequencing-batch reactor configuration (8 L total volume) to evaluate the impact of an aerobic phase on denitrification and pesticide removal performance. The sequencing-batch reactor achieved 89.2 ± 8.8% nitrate removal with a hydraulic retention time (HRT) of 12 h, while the continuous-flow design achieved 55.6 ± 9.1% nitrate removal with a 12 h HRT. There was no significant difference between pesticide removal between sequencing-batch and continuous-flow reactor types (p = 0.655 and p = 0.316 for diuron and imidacloprid removal, respectively). Kinetic batch tests revealed sorption, not microbial degradation, as the main mechanism of removal for both diuron and imidacloprid under denitrifying conditions. Imidacloprid removal ranged from 440.4 to 532.0 ng/gwoodchip (dry mass) and diuron removal between 468.6 and 553.8 ng/g-woodchip (dry mass) over 24 h. The bench-scale evaluation of pesticide behavior in woodchip bioreactors highlights the need to improve microbial degradation in such best management practices for pesticide removal.

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Section: Pesticide Treatment Potentialsupporting

confidence: 93%

Assessment of Woodchip Bioreactor Characteristics and Their Influences on Joint Nitrate and Pesticide Removal

et al. 2021

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“…The analysed soils sorbed thiacloprid more strongly than acetamiprid, with a markedly faster initial reaction phase: in the first 15 min, an average of 45% of the applied insecticide dose of thiacloprid and 37% of the acetamiprid was already sorbed. In Mediterranean soils, Rodriguez-Liebana et al also found significant thiacloprid sorption in the first 15 min of the reaction, up to the amount of 35% [ 48 ], while Aseperi et al reported an extremely high percentage of sorption in UK soils (79–82%) during the rapid phase of the reaction (15 min) [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that, from the total neonicotinoid active substance applied in seed treatment, only 2–20% is sorbed by the crop, while the rest is transferred on or through the soil ecosystem [ 12 , 13 , 29 ] (Note that application rates are up to 0.62 kg and 0.57 kg active ingredient per hectare for acetamiprid and thiacloprid, respectively [ 30 , 31 ]). The fate and distribution of those active substances are controlled by the sorption, desorption and degradation processes, which, in turn, depend on soil physico-chemical properties [ 19 , 32 , 33 , 34 , 35 , 36 ]. Generally, soil degradation is faster for acetamiprid, with a half-life in the field of 3 days, compared to 8.8 days for thiacloprid [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Those That Remain: Sorption/Desorption Behaviour and Kinetics of the Neonicotinoids Still in Use

Modrić¹,

Didović

Dubrović³

et al. 2023

IJMS

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In January 2023, the derogation loophole was closed on “emergency authorisations” for the use of three out of five neonicotinoids in all EU states. In this study, we analysed the sorption/desorption behaviour and kinetic parameters of acetamiprid and thiacloprid, the two neonicotinoids that are still approved for use, either regularly or under emergency authorisations in the EU, and widely used worldwide. Sorption and desorption curves in four soils with different organic matter content were analysed using four kinetic models, namely, Lagergren’s pseudo first-order model, two-site model (TSM), Weber–Morris intraparticle diffusion model and Elovich’s model. Kinetic parameters were correlated to soil physico-chemical characteristics. To determine the mutual influence of soil characteristics and sorption/desorption parameters in the analysed soils, a factor analysis based on principal component analysis (PCA) was performed. Even though the two insecticides are very similar in size and chemical structure, the results showed different sorption/desorption kinetics. The model that best fits the experimental data was TSM. Thiacloprid showed a more rapid sorption compared to acetamiprid, and, in all soils, a higher proportion sorbed at equilibrium. Intra-particle diffusion seemed to be a relevant process in acetamiprid sorption, but not for thiacloprid. Desorption results showed that acetamiprid is more easily and more thoroughly desorbed than thiacloprid, in all soils. The kinetic behaviour differences stem from variations in molecular structure, causing disparate water solubility, lipophilicity, and acid–base properties.

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“…The partition of IMI between clay and SOM is thus biased towards the SOM to a much greater extent compared to DIM. This view is consistent with studies that showed that (a) the IMI sorption coefficient is an order of magnitude larger for sorption on pure humic acids compared to the one obtained on pure clay [ 60 , 70 ]; (b) IMI has a strong affinity to the hydrophobic environment [ 71 ]; (c) IMI’s pyrimidine aromatic ring tends to be embedded in the environment of aromatic amino acid residues [ 6 ], and (d) the neonicotinoids, in general, have the low affinity for soil minerals [ 72 ]. Additionally, the results for both pesticides showed a rise in K F values proportional to SOM content, as expected [ 73 , 74 ], but the correlation was nearly perfect for IMI and less so for DIM ( Figure 2 c), which further corroborates the aforementioned conclusions.…”

Section: Resultsmentioning

confidence: 99%

Emerging Contaminant Imidacloprid in Mediterranean Soils: The Risk of Accumulation Is Greater than the Risk of Leaching

Didović

Kowalkowski

Broznić

2022

Toxics

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Imidacloprid (IMI) is an extensively used neonicotinoid insecticide whose occurrence in the environment is a worldwide problem. Its sorption/transport properties are recognized as one of the key knowledge gaps hindering policymaking regarding its international routine monitoring in soils. Therefore, we studied IMI transport behaviour in Croatian Mediterranean soils using column experiments. Breakthrough curves were analysed using the two-site adsorption model and compared against dimethoate (DIM). Transport parameters were correlated to soil physicochemical properties. The results indicate that IMI shows a high degree of preference for soil organic matter over any other soil constituent. For IMI, the clay did not exhibit any sorption activity, while hematite did act as an active sorbent. Contrarily, hematite increased the leachability of DIM by blocking the active sorption sites on clay platelets. Both hematite and clay sorption acted as type-2 (i.e., rate-limiting) sites. In all soils, IMI exhibited lower short-term leachability than DIM. Combined with a body of data concerning other aspects of IMI environmental behaviour, the results indicate that the risk of accumulation of IMI in the soil is greater than the risk of contamination by leaching. Thus, continuous monitoring of IMI in soils should be incorporated into future soil health protection programs.

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Behaviour of neonicotinoids in contrasting soils

Cited by 43 publications

References 43 publications

Assessment of Woodchip Bioreactor Characteristics and Their Influences on Joint Nitrate and Pesticide Removal

Assessment of Woodchip Bioreactor Characteristics and Their Influences on Joint Nitrate and Pesticide Removal

Those That Remain: Sorption/Desorption Behaviour and Kinetics of the Neonicotinoids Still in Use

Emerging Contaminant Imidacloprid in Mediterranean Soils: The Risk of Accumulation Is Greater than the Risk of Leaching

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