Flowerlike Ni–NiO composite as magnetic solid-phase extraction sorbent for analysis of carbendazim and thiabendazole in edible vegetable oils by liquid chromatography-mass spectrometry

•A flowerlike Ni–NiO composite was synthesized via a simple water–DMF mixed solvothermal process.•The flowerlike Ni–NiO composite displayed high affinity towards benzimidazole fungicides.•MSPE procedure was established to selectively enrich benzimidazole fungicides from oil samples.•The method delivered low LOD, good recoveries and satisfactory precision.