Title Combination of dispersive solid phase extraction with dispersive liquid–liquid microextraction for the determination of multi-residue pesticides from mango; Application of simplex centroid design in optimisation of the extractant composition Type of Research Article Keywords - Abstract - Researchers (First Researcher)، Mir Ali Farajzadeh (Second Researcher)، mohammadreza afshar moghadam (Third Researcher)، Zahra Ayazi (Fourth Researcher)