Kinetics and mechanism of the hydrolysis of imidacloprid

Zheng, Wei; Liu, Weiping

doi:10.1002/(sici)1096-9063(199904)55:4<482::aid-ps932>3.3.co;2-v

Cited by 17 publications

(33 citation statements)

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“…Imidacloprid is easily hydrolyzed in a basic medium and is more stable in acidic and neutral aqueous media. According to the results of Zheng and Liu [21], imidacloprid remains stable at pH 3 for 3 months. At pH 5 and 7, it is slightly hydrolyzed, while the hydrolysis becomes more rapid under basic conditions.…”

Section: Resultsmentioning

confidence: 95%

Determination of the Insecticide Imidacloprid in Potato (Solanum tuberosum L.) and Onion (Allium cepa) by High-Performance Liquid Chromatography with Diode-Array Detection

et al. 2005

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A high-performance liquid chromatography (HPLC) method has been proposed for the determination of imidacloprid residues in fortified potato ( Solanum tuberosum L.) and onion ( Allium cepa ) and in treated potato and onion samples. Sample preparation consisted of dichloromethane extraction of imidacloprid from the plant material, followed by purification of the obtained onion extract on an LC-Florisil disposable cartridge. The obtained potato extracts were further analyzed without purification. The HPLC-diode-array-detection (DAD) method has been developed on reversed phase for separation of imidacloprid with isocratic elution with a mixture of 0.01 M phosphate buffer (pH 3.15) and acetonitrile (75 : 25, v/v). Spectral data obtained with DAD allow the identification of imidacloprid residue. Detector response showed a linear dynamic range from 0.0125 to 0.500 µ g/mL. Imidacloprid was recovered from fortified samples in a range of 94-99%. The within-day RSD of repeatability of the retention time of imidacloprid standard solution was less than 0.1% and of the obtained peak area less than 5%. For potato and onion samples, the limits of detection were 0.0075 and 0.0060 mg/kg and the limits of determination were 0.015 and 0.012 mg/kg, respectively.

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Section: Resultsmentioning

confidence: 95%

Determination of the Insecticide Imidacloprid in Potato (Solanum tuberosum L.) and Onion (Allium cepa) by High-Performance Liquid Chromatography with Diode-Array Detection

et al. 2005

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“…There are numerous factors that influence the dissipation of imidacloprid from the soil environment . Under field conditions, the half‐life of imidacloprid in the soil varied from 27 to 229 days.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of vegetation has a considerable impact on the rate of imidacloprid dissipation . Other factors, such as soil type, pH, groundcover, soil microbiota or organic fertilisers, influence the survival of imidacloprid . The presence of light is of particular importance because the photolysis of imidacloprid in water produces imidacloprid‐urea and a series of other metabolites .…”

Section: Introductionmentioning

confidence: 99%

“…The presence of light is of particular importance because the photolysis of imidacloprid in water produces imidacloprid‐urea and a series of other metabolites . Moreover, the simple hydrolysis of imidacloprid in darkness forms imidacloprid‐urea . The persistence of imidacloprid in the soil environment without light is convenient for seed and soil treatments, allowing continual plant protection .…”

Section: Introductionmentioning

confidence: 99%

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Distributions of imidacloprid, imidacloprid‐olefin and imidacloprid‐urea in green plant tissues and roots of rapeseed (Brassica napus) from artificially contaminated potting soil

Seifrtova

Halešová

Sulcova

et al. 2016

Pest Management Science

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Significant proportions of imidacloprid-olefin and imidacloprid-urea in green plant tissues were demonstrated. The greater imidacloprid supply increased the imidacloprid-olefin/imidacloprid molar ratio in the green plant tissues. The absence of imidacloprid-olefin in the root excluded its retransport from leaves. The similar imidacloprid/imidacloprid-urea ratios in the soil and root indicated that the root serves primarily for transporting these substances. © 2016 Society of Chemical Industry.

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“…The present results agree with those reported by other researchers, and all are justification for considering soil pH when making termiticide applications to construction sites. Alkaline pH values caused degradation of chlorpyrifos,8, 25 imidacloprid,33, 34 fipronil35 and pyrethroids36 in solution. Portland cement increased the pH of soil around structures and under laboratory conditions.…”

Section: Discussionmentioning

confidence: 99%

Influence of Portland cement amendment on soil pH and residual soil termiticide performance

Richman¹,

Tucker²,

koehler³

2006

Pest Management Science

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Soil adjacent to new brick veneer work is likely to have a higher pH owing to the mixture of cement with the soil. In the Gainesville, FL, area, soil samples taken from such locations had a range of pH values from 9.0 to 10.1; similar soils used in bioassays had a pH of 5.6 before the addition of cement. Addition of 15 mg of Portland cement to 33 g of soil increased the pH to 6, and addition of 291 mg of Portland cement increased the pH to 9. The pH of soil amended with cement was stable for the first 5 months. After 10 months, soil pH values decreased from alkaline to near neutral in all cases. Eastern subterranean termite workers, Reticulitermes flavipes (Kollar), were exposed to the treated soil at pH 6-9 for 24 h, and percentage mortality was recorded at 5 days, 5 months and 10 months. Termite mortality significantly decreased at higher soil pHs for bifenthrin, chlorpyrifos, fipronil and imidacloprid treatments at 5 months and similarly for bifenthrin, permethrin, chlorpyrifos, fipronil and imidacloprid treatments at 10 months. There was an inverse linear relationship between soil pH and mortality. Increased soil pH diminished residual activity of termiticide in the following order: imidacloprid > fipronil > chlorpyrifos = bifenthrin > permethrin > cypermethrin.

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Kinetics and mechanism of the hydrolysis of imidacloprid

Cited by 17 publications

References 0 publications

Determination of the Insecticide Imidacloprid in Potato (Solanum tuberosum L.) and Onion (Allium cepa) by High-Performance Liquid Chromatography with Diode-Array Detection

Determination of the Insecticide Imidacloprid in Potato (Solanum tuberosum L.) and Onion (Allium cepa) by High-Performance Liquid Chromatography with Diode-Array Detection

Distributions of imidacloprid, imidacloprid‐olefin and imidacloprid‐urea in green plant tissues and roots of rapeseed (Brassica napus) from artificially contaminated potting soil

Influence of Portland cement amendment on soil pH and residual soil termiticide performance

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