Analysis of metalaxyl residues in wines by SPE in combination with HRCGC and GC/MS

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Abstract
Solid phase extraction (SPE) with the porous carbon sorbent CARB GR was used for the preconcentration of metalaxyl residues from a variety of Slovak grape wines with subsequent capillary GC and GC/MS analysis. Recovery was tested at various concentrations of metalaxyl in standard solutions (recovery,R≥92%, relative standard deviation RSD≤4.3%) and in wines. The value of recovery in spiked wines was dependent on the concentration (studied in the range 0.02–1.96 mg/1) and on the variety of wine (R=80–99%; RSD=2–7%). Limits of quantitation (for a sample volume of 50 ml) were determined to be 0.75 μg/1 with GC-FID and 0.50 μg/1 with GC/MS-ITD. Concentration levels of metalaxyl residues were determined in treated wines (with 0.25% Ridomil plus 48 WP) and a strong dependence on the protective term before the harvest was shown.

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