Evaluation of leaching potential of three systemic neonicotinoid insecticides in vineyard soil

Kurwadkar, Sudarshan; Wheat, Remington; McGahan, Donald G.; Mitchell, Forrest L.

doi:10.1016/j.jconhyd.2014.09.009

Cited by 44 publications

(23 citation statements)

References 24 publications

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“…The shape of BTCs for cymoxanil in the unamended soil with short final tails was considered similar to that found for the conservative ion, and indicates a rapid leaching kinetics due to the weak interaction between this polar fungicide and the unamended soil. Similar BTCs have been obtained for the leaching of other polar fungicides, herbicides (Rodríguez-Cruz et al, 2011) or insecticides (Kurwadkar et al, 2014) in soils of different characteristics. The adsorption of polar compounds by soils is usually low, and it could decrease in column leaching experiments compared to batch adsorption experiments.…”

Section: Leaching Of Cymoxanil In Unamended and Sms-amended Soil Colusupporting

confidence: 71%

Leaching of two fungicides in spent mushroom substrate amended soil: Influence of amendment rate, fungicide ageing and flow condition

Álvarez‐Martín

Sánchez-Martín

Ordax

et al. 2017

Science of The Total Environment

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A study has been conducted on the leaching of two fungicides, tebuconazole and cymoxanil, in a soil amended with spent mushroom substrate (SMS), with an evaluation of how different factors influence this process. The objective was based on the potential use of SMS as a biosorbent for immobilizing pesticides in vulnerable soils, and the need to know how it could affect the subsequent transport of these retained compounds. Breakthrough curves (BTCs) for C-fungicides, non-incubated and incubated over 30days, were obtained in columns packed with an unamended soil (S), and this soil amended with SMS at rates of 5% (S+SMS5) and 50% (S+SMS50) under saturated and saturated-unsaturated flows. The highest leaching of tebuconazole (>50% of the total C added) was found in S when a saturated water flow was applied to the column, but the percentage of leached fungicide decreased when a saturated-unsaturated flow was applied in both SMS-amended soils. Also a significant decrease in leaching was observed for tebuconazole after incubation in the column, especially in S+SMS50 when both flows were applied. Furthermore, cymoxanil leaching was complete in S and S+SMS when a saturated flow was applied, and maximum peak concentrations were reached at 1pore volume (PV), although BTCs showed peaks with lower concentrations in S+SMS. The amounts of cymoxanil retained only increased in S+SMS when a saturated-unsaturated flow was applied. A more relevant effect of SMS for reducing the leaching of fungicide was observed when cymoxanil was previously incubated in the column, although mineralization was enhanced in this case. These results are of interest for extending SMS application on the control of the leaching of fungicides with different physicochemical characteristics after different ageing times in the soil and water flow conditions applied.

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Section: Leaching Of Cymoxanil In Unamended and Sms-amended Soil Colusupporting

confidence: 71%

Leaching of two fungicides in spent mushroom substrate amended soil: Influence of amendment rate, fungicide ageing and flow condition

Álvarez‐Martín

Sánchez-Martín

Ordax

et al. 2017

Science of The Total Environment

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“…Degradation in sediments is faster for newly developed compounds like cycloxaprid (Liu et al, 2015). Up to 6% of imidacloprid residues in soil can be transported in runoff after storm events (Thuyet et al, 2012), but most of the residual chemical would remain in the applied field, from where it moves readily into ground waters, particularly thiamethoxam, imidacloprid, clothianidin (González-Pradas et al, 2002;Miranda et al, 2011;Bajeer et al, 2012) and dinotefuran (Kurwadkar et al, 2014). The increasing use of products containing neonicotinoids and their repeated application as coated seeds in agricultural fields (Douglas and Tooker, 2015) adds every year a new layer of residues to the soil, and hence to the waters, where residue levels are a reflection of those present in soil at any time (Hladik et al, 2014;Schaafsma et al, 2015).…”

Section: Impacts At the Population Levelmentioning

confidence: 99%

Contamination of the Aquatic Environment with Neonicotinoids and its Implication for Ecosystems

Sánchez‐Bayo

Goka

Hayasaka

2016

Front. Environ. Sci.

205

103

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The widespread use of systemic neonicotinoid insecticides in agriculture results first in contamination of the soil of the treated crops, and secondly in the transfer of residues to the aquatic environment. The high toxicity of these insecticides to aquatic insects and other arthropods has been recognized, but there is little awareness of the impacts these chemicals have on aquatic environments and the ecosystem at large. Recent monitoring studies in several countries, however, have revealed a worldwide contamination of creeks, rivers and lakes with these insecticides, with residue levels in the low µg/L (ppb) range. The current extent of aquatic contamination by neonicotinoids is reviewed first, and the findings contrasted with the known acute and chronic toxicity of neonicotinoids to various aquatic organisms. Impacts on populations and aquatic communities, mostly using mesocosms, are reviewed next to identify the communities most at risk from those that undergo little or no impact. Finally, the ecological links between aquatic and terrestrial organisms are considered. The consequences for terrestrial vertebrate species that depend mainly on this food source are discussed together with impacts on ecosystem function. Gaps in knowledge stem from difficulties in obtaining long-term experimental data that relates the effects on individual organisms to impacts on populations and ecosystems. The paper concludes with a summary of findings and the implications they have for the larger ecosystem.

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“…The experiment showed that DOC reduced IMD retardation and increased its leaching potential [ 17 ]. Also, a recent soil column study comparing pulse solutions with individual-solute and mixed-solutes showed that leaching potential for selected neonicotinoids followed IMD < TMX < DTN, with their mobility strongly correlated with the pesticide’s solubility in water [ 18 ]. Furthermore, our data on IMD soil batch kinetics and equilibria, as well as degradation rates in sandy soils of Florida showed that IMD had a moderate-to-weak sorption and persistence in these soils [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Imidacloprid transport and sorption nonequilibrium in single and multilayered columns of Immokalee fine sand

et al. 2017

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Imidacloprid (IMD) is a neonicotinoid pesticide soil-drenched to many crops to control piercing-sucking insects such as the Asian citrus psyllid (ACP). Neonicotinoids are persistent in the environment and transport analyses are helpful estimate leaching potential from soils that could result in groundwater pollution. The objective of this study was to analyze IMD breakthrough under saturated water flow in soil columns packed with three horizons (A, E, Bh) of Immokalee Fine Sand (IFS). Also, we used the dimensionless form of the convective-dispersive model (CD-Model) to compare the optimized transport parameters from each column experiment (retardation factor, R; fraction of instantaneous-to-total retardation, β; and mass transfer coefficient, ω) with the parameters obtained from sorption batch equilibria and sorption kinetics. The tracer (Cl-) breakthrough curves (BTCs) were symmetrical and properly described by the CD-Model. IMD BTCs from A, Bh, and multilayered [A+E+Bh] soil columns showed steep fronts and tailing that were well described by the one-site nonequilibrium (OSNE) model, which was an evidence of non-ideal transport due to IMD mass transfer into the soil organic matter. In general, IMD was weakly-sorbed in the A and Bh horizons (R values of 3.72 ± 0.04 and 3.08 ± 0.07, respectively), and almost no retardation was observed in the E horizon (R = 1.20 ± 0.02) due to its low organic matter content (0.3%). Using the HYDRUS-1D package, optimized parameters (R, β, ω) from the individual columns successfully simulated IMD transport in a multilayered column mimicking an IFS soil profile. These column studies and corresponding simulations agreed with previous findings from batch sorption equilibria and kinetics experiments, where IMD showed one-site kinetic mass transfer between soil surfaces and soil solution. Ideally, sandy soils should be maintained unsaturated by crop irrigation systems and rainfall monitoring during and after soil-drench application. The unsaturated soil will increase IMD retardation factors and residence time for plant uptake, lowering leaching potential from soil layers with low sorption capacity, such as the E horizon.

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Evaluation of leaching potential of three systemic neonicotinoid insecticides in vineyard soil

Cited by 44 publications

References 24 publications

Leaching of two fungicides in spent mushroom substrate amended soil: Influence of amendment rate, fungicide ageing and flow condition

Leaching of two fungicides in spent mushroom substrate amended soil: Influence of amendment rate, fungicide ageing and flow condition

Contamination of the Aquatic Environment with Neonicotinoids and its Implication for Ecosystems

Imidacloprid transport and sorption nonequilibrium in single and multilayered columns of Immokalee fine sand

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