A simple sample pretreatment for simultaneous determination of nine fungicides (triadimefon, picoxystrobin, kresoxim-methyl, diniconazole, epoxiconazole, trifloxystrobin, triticonazole, difenoconazole, and azoxystrobin) in chrysanthemum was developed using matrix extraction-vortex-assisted dispersive liquid�liquid microextraction (ME-VADLLME) prior to gas chromatography with electron capture detection. The target fungicides were firstly extracted with acetonitrile in presence of the mixture of primary secondary amineandgraphite carbon black followed by VADLLME using toluene with a lower density than water as the extraction solvent and 1.5 mL of the acetonitrile extract as the dispersive solvent. The fine droplet of toluene was collected on the upper of the mixed toluene/acetonitrile/water system using a 0.1-mL pipettor instead of a special vessel . For validation purposes, recovery studies were carried out at two concentration levels, yielding recoveries in the range of 73.9-95.1% with relative standard deviations of 3.5�9.7% for all of the analytes. The limits of detection were in the range of 0.005�0.05 �g kg-1. The proposed procedure provides remarkable enrichment factors up to 90-fold and an effective cleanup of chrysanthemum matrix. The good performance, being compared with the conventional QuEChERS, solid phase extraction and previously reported methods, has demonstrated that it is superior in terms of high sensitivity, simple operation, and minimal solvent consumption, which can be applied to the analysis of complex samples .

Rapid and sensitive analysis of nine fungicide residues in chrysanthemum by matrix extraction-vortex-assisted dispersive liquid�liquid microextraction

248th National Meeting (2014)

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