AI Article Synopsis
- The study explores effective sample preparation methods using solid-phase extraction (SPE) to detect seven neonicotinoid insecticides in agricultural products.
- After extracting the samples with acetone, the insecticides were transferred to an organic solvent using a specialized SPE cartridge, which proved more efficient when cleaned with a unique combination of materials.
- The method demonstrated high recovery rates for most insecticides tested, achieving low detection limits, although one insecticide, nitenpyram, showed less satisfactory results.
Article Abstract
Effective sample pretreatment procedures based on solid-phase extraction (SPE) for multiresidue determination of seven neonicotinoid insecticides in agricultural products were investigated. After extraction with acetone and concentration, the insecticides in aqueous sample extracts were transferred into organic solvent phases with a Chem Elut SPE cartridge. Finally, the eluate from the cartridge was cleaned up with a SPE cartridge packed with graphitized carbon black and aminopropyl silica gel, which showed a higher cleanup efficiency than the classical silica gel SPE cartridge. Seven insecticides were separated on a reversed-phase C18 column and a gradient system of methanol and phosphate solution based on high-performance liquid chromatography. The established multiresidue determination has been applied to several artificially spiked agricultural samples, with the result that the average recoveries were excellent, with the exception of nitenpyram. The limit of detection of the method ranged from 0.01 to 0.03 mg/kg for the insecticides.
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| http://dx.doi.org/10.1021/jf063140m | DOI Listing |
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