Detection of herbicide clopyralid at nanogram per gram level in agricultural products using easy-to-use micro liquid–liquid extraction followed by analysis with ultraperformance liquid chromatography–tandem mass spectrometry

•We developed a sample preparation method to analyze clopyralid in crop samples.•Micro liquid–liquid extraction was used effectively for sample extract cleanup.•No matrix effect was found to interfere with the analysis of clopyralid.•The proposed analytical method showed good recovery, accuracy, and sensitivity.