Abstract
Pesticide residues were analyzed in dead honeybees by gas chromatography-tandem mass spectrometry (GC-MS/MS). Sample preparation using QuEChERS was followed by purification on a mixture of PSA and C18 sorbents. The extraction efficiency of > 80% was obtained for all analytes and pesticides were quantified in the range of 5-1000 ng/g. This method was used for investigating incidents of honeybees poisoning by pesticides. Fipronil was detected in all of the investigated samples originating from different regions of Russia. Additionally, τ-fluvalinate was detected in three samples.
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