Kinetics and mechanism of the hydrolysis of imidacloprid

Zheng, Wei; Liu, Weiping

doi:10.1002/(sici)1096-9063(199904)55:4<482::aid-ps932>3.0.co;2-3

Cited by 82 publications

(17 citation statements)

References 3 publications

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“…In general, imidacloprid concentrations in paddy water declined with time due to dilution and losses through percolation and runo 1,2) in addition to possible degradation processes such as photodegradation [17][18][19] and hydrolysis 17,19,20) in paddy water (Fig. 2).…”

Section: Dissipation Of Imidacloprid In Paddy Watermentioning

confidence: 96%

Behavior of nursery-box-applied imidacloprid in micro paddy lysimeter

et al. 2012

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A micro paddy lysimeter (MPL) was employed to monitor the behavior of nursery-box-applied imidacloprid granules in the rice paddy environment using two treatment methods, i.e. before transplanting (BT) and at sowing (AS). Tested application rates were three-fold the recommended rate. Under a water management scenario in an actual eld, the behavior of nursery-box-applied imidacloprid granules in paddy water and paddy soil in MPL was comparable with eld monitoring data in the literature. Imidacloprid concentration in water peaked at 189±36 μg/L and 13.1±1.4 μg/L at 1 day a er transplanting (DAT), and the halflives (DT 50 ) were 2.5 days, and 4.7 days for BT and AS treatments, respectively. In the soil pro le, the maximum concentration of imidacloprid at 21 DAT was 65.6±0.4 μg/kg and 39.7±4.9 μg/kg in the 0-2.5 cm layer in the inter-row zone for BT and AS treatments, respectively. Imidacloprid was found in the 12.5-15.0 cm layer at 3.2±0.7 μg/kg for BT treatment and 13.7±3.8 μg/kg for AS treatment, in the inter-row zone. In AS treatment, imidacloprid mainly stayed in the root zone (0-5 cm surface soil layer), and its concentration was 895±4 μg/kg at 21 DAT. MPL presented as a convenient and alternative tool to monitor the behavior of nursery-box-applied pesticide in the rice paddy environment.

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Section: Dissipation Of Imidacloprid In Paddy Watermentioning

confidence: 96%

Behavior of nursery-box-applied imidacloprid in micro paddy lysimeter

et al. 2012

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“…In general, imidacloprid concentration in paddy water and paddy surface soil for both treatments declined exponentially with time due to dilution and losses through percolation and runoff in addition to degradation processes such as photodegradation 2,21,22) and hydrolysis 2,22,23) in paddy water, and leaching and biochemical degradation in surface soil. The concentrations in paddy water sharply declined during the first 7 DAT.…”

Section: Pesticide Behavior In Paddy Water and Paddy Surface Soilmentioning

confidence: 99%

Effect of formulations and treatment methods of nursery boxes applied with insecticide on the behavior of imidacloprid in rice paddy fields

2011

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The behavior of imidacloprid was investigated in two paddy plots with conventional release granular formulation and controlled release granular formulation corresponding to before transplanting (BT) treatment and at sowing (AS) treatment (14 days before transplanting) in nursery boxes, respectively. The maximum concentrations of imidacloprid were 30.2 mg/l and 3.0 mg/l in paddy water at 0.5 days after transplanting (DAT), and 278.4 mg/kg and 81.4 mg/kg in 1cm paddy surface soil at 1 DAT for BT and AS treatments, respectively. Dissipation of imidacloprid from paddy water and 1 cm paddy surface soil can be described by biphasic first-order kinetics in the water and single phase first-order kinetics in paddy soil. The half-lives (DT 50 ) of imidacloprid in BT and AS treatments were 2.0 days, 2.4 days during the first phase (7 days) in paddy water, and 12.7 days and 11.0 days in paddy soil, respectively. AS treatment with controlled release granular formulation had lower concentrations of imidacloprid in paddy water and surface soil and has the potential to pose a lower environmental risk than BT treatment with conventional release granular formulation.

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“…It is reported that adsorption is one of the most important processes which controls all other processes such as their movement, persistence and degradation and determines the fate of pesticides in soil systems [13]. Extensive research has been done on imidacloprid in relation to its mobility and leaching potential in soils [14][15][16].…”

Section: Introductionmentioning

confidence: 95%

Adsorption and Leaching Potential of Imidacloprid Pesticide through Alluvial Soil

Bajeer¹,

Nizamani²,

Sherazi³

et al. 2012

AJAC

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This study was aimed to assess the adsorption and leaching potential of imidacloprid pesticide in column and field soil. To understand mechanism of adsorption and factors affecting, the experiments were carried out under laboratory and field conditions. Adsorption study was divided into kinetic and equilibrium sections. The evaluation of kinetic data was done through pseudo first and second order models. It was found that kinetic adsorption of imidacloprid on soil followed pseudo second order with rate constant value of 4.333 mg/g/h. Langmuir and Freundlich isotherms were used to explain equilibrium adsorption, from these isotherms it was evaluated that Freundlich isotherm was obeyed well with adsorption capacity of 2.190 -4.573 mol/g. Leaching study was performed in laboratory using column made of polyvinyl chloride having 30 cm length. Known amount of imidacloprid pesticide was applied to column left for adsorption and then eluted with 500 mL water in five equal portions. These water portions and soil of column which was divided into three sections were analyzed by HPLC. The result revealed that the concentration of imidacloprid was decreased from 0.481 ppm in first portion of water to 0.327 ppm in last portion of water while 0.783 ppm in first section of column soil to 0.038 ppm in last section of column soil. In field the leaching power of imidacloprid was observed up to 60 cm depth, its concentration decreased with soil depth. It was 3.311 ppm in first portion of soil and 0.357 ppm in last portion of soil. The leaching potential of imidacloprid pesticide up to 60 cm soil depth was due to less organic matter, sandy texture, alkaline pH, and low cation exchange capacity.

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Kinetics and mechanism of the hydrolysis of imidacloprid

Cited by 82 publications

References 3 publications

Behavior of nursery-box-applied imidacloprid in micro paddy lysimeter

Behavior of nursery-box-applied imidacloprid in micro paddy lysimeter

Effect of formulations and treatment methods of nursery boxes applied with insecticide on the behavior of imidacloprid in rice paddy fields

Adsorption and Leaching Potential of Imidacloprid Pesticide through Alluvial Soil

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