6533b85afe1ef96bd12b8dda

RESEARCH PRODUCT

Comparison of different sorbents for on-line liquid-solid extraction followed by high-performance liquid chromatographic determination of nitrogen-containing pesticides

José Miguel SorianoBeatriz JiménezJuan Carlos MoltóM.j. Redondo

subject

Detection limitVinyl CompoundsChromatographyNitrogenChemistryElutionOrganic ChemistryExtraction (chemistry)General MedicineReversed-phase chromatographySilicon DioxideBiochemistryHigh-performance liquid chromatographyBackflush accountingCarbonAnalytical ChemistryPolystyrenesIndicators and ReagentsSpectrophotometry UltravioletSample preparationSolid phase extractionPesticidesChromatography High Pressure Liquid

description

Abstract LiChrolut EN [poly(styrene-divinylbenzene), PSDVB], Carbograph (graphitized carbon black, GCB), Isolute CN (cyanopropylsilica), Isolute C 2 (ethylsilica), and LiChrospher RP18 (octadecylsilica) were studied for on-line solid-phase extraction of twelve nitrogen containing pesticides from water. Determination (UV 210 nm) was performed with a Spherisorb C 8 analytical column and an acetonitrile-water gradient. The mean recoveries from 50 ml ranged from 83% for RP18 to 44% for GCB, and decreased in the following order: RP18, CN, LiChrolut EN, C 2 , and GCB. GCB showed poor recoveries due to incomplete desorption with the acetonitrile-water gradient used, and memory effects were detected. Backflush was needed to elute selected pesticides from GCB and from LiChrolut EN. Breakthrough volumes were 50–100 ml for most selected pesticides with silica-based phases, whereas LiChrolut EN allowed larger sample volumes without observable losses.

yearjournalcountryeditionlanguage
1998-11-12Journal of Chromatography A
https://doi.org/10.1016/s0021-9673(98)00573-1