Title Zr-based metal–organic framework incorporated polystyrene nanocomposite as a novel sorbent for ultrasound assisted-thin film microextraction of organophosphorus pesticides from complex samples Type of Research Article Keywords Organophosphorus pesticides Ultrasound assisted-thin film micro extraction Metal-organic framework Polystyrene Vegetables and fruits samples Gas chromatography Abstract - Researchers Zahra Ayazi (First Researcher)، (Second Researcher)، (Third Researcher)، Seyed Masoud S eyed Ahmadian (Fourth Researcher)